TARGET:          2284 San Juan
SESSION NUMBER:  197
DATE/TIME:       2008 Mar 25 @ 07:48
FILTER:          C
TELESCOPE:       300 mm f11.5 cass
FOCAL LENGTH:    137.26
CAMERA:          AltaU6 1x bin
TEMP (C):        -30
EXPOSURE (s):    150
APPROX. RA:      12:06
APPROX. DEC:     + 5
EXPOSURE JD:     Mid-exposure
JD CORR METHOD:  Light-time
JD CORRECTION:   JD = JD(raw) - 0.00712d
UNITY CORR:      -5 * log(SunDist * EarthDist): -2.1942
NOTE: The unity correction is NOT included in the reduced magnitudes.
MAG. METHOD:     Instrumental
 
NOTE:            For multiple sessions, differential magnitudes include
                 adjustments ADDED to the Obj-CAvg value to compensate
                 for changing phase angle, distance, and refinements to
                 the base average value of the comparison stars.       
                                                                       
                 The phase angle calculations include the effects of   
                 the phase parameter, G. This value is taken from the  
                 MPCORB value at the time the calculations were made.
BASE COMP VALUE: -8.010
BASE CORRECTION: +0.000
PHASE/DIST CORR: +0.000
P/D ADJUST (-/DAY):+0.024
P/D ADJUST (+/DAY):-0.024
THE P/D ADJUSTMENTS ARE INCLUDED IN THE VALUES BELOW.
 
ERROR CALC:      The magnitude error is calculated by the following:
                 Err = sqrt(sqr(ERR[target]) + sqr(Err[Comps]))
                       where Err[Target] = 1.0857/SNR[target]
                             Err[Comps]  = sqrt(sqr(1.0857/SNR[Comp1])... + sqr(1.0857/SNR[CompN])) / N
                 The factor of 1.0857 converts flux to magnitudes (Howell)
 
*********************************************************************************************
TARGET:          2284 San Juan
SESSION NUMBER:  198
DATE/TIME:       2008 Mar 26 @ 07:59
FILTER:          C
TELESCOPE:       300 mm f11.5 cass
FOCAL LENGTH:    136.78
CAMERA:          AltaU6 1x bin
TEMP (C):        -30
EXPOSURE (s):    150
APPROX. RA:      12:05
APPROX. DEC:     + 5
EXPOSURE JD:     Mid-exposure
JD CORR METHOD:  Light-time
JD CORRECTION:   JD = JD(raw) - 0.00713d
UNITY CORR:      -5 * log(SunDist * EarthDist): -2.1960
NOTE: The unity correction is NOT included in the reduced magnitudes.
MAG. METHOD:     Instrumental
 
NOTE:            For multiple sessions, differential magnitudes include
                 adjustments ADDED to the Obj-CAvg value to compensate
                 for changing phase angle, distance, and refinements to
                 the base average value of the comparison stars.       
                                                                       
                 The phase angle calculations include the effects of   
                 the phase parameter, G. This value is taken from the  
                 MPCORB value at the time the calculations were made.
BASE COMP VALUE: -7.670
BASE CORRECTION: +0.340
PHASE/DIST CORR: +0.026
P/D ADJUST (-/DAY):+0.026
P/D ADJUST (+/DAY):-0.026
THE P/D ADJUSTMENTS ARE INCLUDED IN THE VALUES BELOW.
 
ERROR CALC:      The magnitude error is calculated by the following:
                 Err = sqrt(sqr(ERR[target]) + sqr(Err[Comps]))
                       where Err[Target] = 1.0857/SNR[target]
                             Err[Comps]  = sqrt(sqr(1.0857/SNR[Comp1])... + sqr(1.0857/SNR[CompN])) / N
                 The factor of 1.0857 converts flux to magnitudes (Howell)
 
*********************************************************************************************
TARGET:          2284 San Juan
SESSION NUMBER:  200
DATE/TIME:       2008 Mar 28 @ 07:29
FILTER:          C
TELESCOPE:       300 mm f11.5 cass
FOCAL LENGTH:    137.01
CAMERA:          AltaU6 1x bin
TEMP (C):        -30
EXPOSURE (s):    150
APPROX. RA:      12:03
APPROX. DEC:     + 5
EXPOSURE JD:     Mid-exposure
JD CORR METHOD:  Light-time
JD CORRECTION:   JD = JD(raw) - 0.00714d
UNITY CORR:      -5 * log(SunDist * EarthDist): -2.1985
NOTE: The unity correction is NOT included in the reduced magnitudes.
MAG. METHOD:     Instrumental
 
NOTE:            For multiple sessions, differential magnitudes include
                 adjustments ADDED to the Obj-CAvg value to compensate
                 for changing phase angle, distance, and refinements to
                 the base average value of the comparison stars.       
                                                                       
                 The phase angle calculations include the effects of   
                 the phase parameter, G. This value is taken from the  
                 MPCORB value at the time the calculations were made.
BASE COMP VALUE: -7.763
BASE CORRECTION: +0.247
PHASE/DIST CORR: +0.079
P/D ADJUST (-/DAY):+0.027
P/D ADJUST (+/DAY):-0.027
THE P/D ADJUSTMENTS ARE INCLUDED IN THE VALUES BELOW.
 
ERROR CALC:      The magnitude error is calculated by the following:
                 Err = sqrt(sqr(ERR[target]) + sqr(Err[Comps]))
                       where Err[Target] = 1.0857/SNR[target]
                             Err[Comps]  = sqrt(sqr(1.0857/SNR[Comp1])... + sqr(1.0857/SNR[CompN])) / N
                 The factor of 1.0857 converts flux to magnitudes (Howell)
 
*********************************************************************************************
TARGET:          2284 San Juan
SESSION NUMBER:  202
DATE/TIME:       2008 Mar 28 @ 07:29
FILTER:          C
TELESCOPE:       300 mm f11.5 cass
FOCAL LENGTH:    136.99
CAMERA:          AltaU6 1x bin
TEMP (C):        -30
EXPOSURE (s):    150
APPROX. RA:      12:03
APPROX. DEC:     + 5
EXPOSURE JD:     Mid-exposure
JD CORR METHOD:  Light-time
JD CORRECTION:   JD = JD(raw) - 0.00714d
UNITY CORR:      -5 * log(SunDist * EarthDist): -2.1985
NOTE: The unity correction is NOT included in the reduced magnitudes.
MAG. METHOD:     Instrumental
 
NOTE:            For multiple sessions, differential magnitudes include
                 adjustments ADDED to the Obj-CAvg value to compensate
                 for changing phase angle, distance, and refinements to
                 the base average value of the comparison stars.       
                                                                       
                 The phase angle calculations include the effects of   
                 the phase parameter, G. This value is taken from the  
                 MPCORB value at the time the calculations were made.
BASE COMP VALUE: -7.991
BASE CORRECTION: +0.019
PHASE/DIST CORR: +0.079
P/D ADJUST (-/DAY):+0.027
P/D ADJUST (+/DAY):-0.027
THE P/D ADJUSTMENTS ARE INCLUDED IN THE VALUES BELOW.
 
ERROR CALC:      The magnitude error is calculated by the following:
                 Err = sqrt(sqr(ERR[target]) + sqr(Err[Comps]))
                       where Err[Target] = 1.0857/SNR[target]
                             Err[Comps]  = sqrt(sqr(1.0857/SNR[Comp1])... + sqr(1.0857/SNR[CompN])) / N
                 The factor of 1.0857 converts flux to magnitudes (Howell)
 
*********************************************************************************************
 
-------------------------------------------
  J.D.          Obj-CAvg    Err    Session
-------------------------------------------
2454550.65834     +1.257   0.022       197
2454550.66017     +1.207   0.020       197
2454550.66201     +1.241   0.021       197
2454550.66384     +1.200   0.019       197
2454550.66566     +1.225   0.019       197
2454550.66820     +1.253   0.019       197
2454550.67003     +1.255   0.019       197
2454550.67186     +1.223   0.018       197
2454550.67367     +1.238   0.018       197
2454550.67549     +1.230   0.018       197
2454550.67799     +1.236   0.017       197
2454550.67979     +1.223   0.017       197
2454550.68161     +1.208   0.017       197
2454550.68340     +1.229   0.017       197
2454550.68520     +1.220   0.016       197
2454550.68758     +1.249   0.017       197
2454550.68936     +1.264   0.018       197
2454550.69115     +1.270   0.019       197
2454550.69295     +1.282   0.016       197
2454550.69475     +1.304   0.017       197
2454550.69712     +1.310   0.018       197
2454550.69892     +1.322   0.018       197
2454550.70072     +1.320   0.018       197
2454550.70249     +1.395   0.018       197
2454550.70430     +1.347   0.016       197
2454550.70667     +1.379   0.016       197
2454550.70847     +1.385   0.016       197
2454550.71027     +1.409   0.017       197
2454550.71207     +1.419   0.017       197
2454550.71386     +1.384   0.015       197
2454550.71601     +1.438   0.016       197
2454550.71781     +1.471   0.017       197
2454550.71961     +1.468   0.017       197
2454550.72141     +1.503   0.018       197
2454550.72320     +1.480   0.018       197
2454550.72550     +1.506   0.018       197
2454550.72727     +1.514   0.018       197
2454550.72907     +1.515   0.019       197
2454550.73087     +1.533   0.020       197
2454550.73267     +1.562   0.021       197
2454550.73476     +1.559   0.021       197
2454550.73654     +1.660   0.028       197
2454550.73832     +1.680   0.025       197
2454550.74012     +1.625   0.022       197
2454550.74191     +1.606   0.021       197
2454550.74396     +1.712   0.023       197
2454550.74576     +1.698   0.022       197
2454550.74756     +1.680   0.022       197
2454550.74935     +1.716   0.023       197
2454550.75115     +1.740   0.024       197
2454550.75322     +1.733   0.023       197
2454550.75500     +1.738   0.023       197
2454550.75679     +1.738   0.023       197
2454550.75859     +1.692   0.022       197
2454550.76038     +1.745   0.023       197
2454550.76271     +1.791   0.024       197
2454550.76450     +1.775   0.024       197
2454550.76630     +1.756   0.023       197
2454550.76809     +1.719   0.023       197
2454550.76987     +1.696   0.022       197
2454550.77215     +1.766   0.024       197
2454550.77395     +1.726   0.024       197
2454550.77575     +1.660   0.028       197
2454550.77753     +1.706   0.026       197
2454550.77932     +1.708   0.022       197
2454550.78139     +1.612   0.021       197
2454550.78318     +1.630   0.021       197
2454550.78497     +1.588   0.021       197
2454550.78677     +1.578   0.021       197
2454550.78856     +1.586   0.021       197
2454550.79085     +1.537   0.019       197
2454550.79262     +1.568   0.020       197
2454550.79440     +1.573   0.021       197
2454550.79619     +1.516   0.019       197
2454550.79799     +1.480   0.018       197
2454550.80003     +1.500   0.019       197
2454550.80182     +1.509   0.019       197
2454550.80360     +1.481   0.018       197
2454550.80539     +1.445   0.018       197
2454550.80718     +1.471   0.018       197
2454550.80942     +1.431   0.017       197
2454550.81121     +1.412   0.017       197
2454550.81301     +1.374   0.017       197
2454550.81480     +1.401   0.017       197
2454550.81661     +1.405   0.018       197
2454550.81883     +1.372   0.019       197
2454550.82063     +1.357   0.020       197
2454550.82244     +1.359   0.018       197
2454550.82423     +1.338   0.017       197
2454550.82602     +1.312   0.016       197
2454550.82804     +1.293   0.016       197
2454550.82983     +1.318   0.018       197
2454550.83161     +1.262   0.019       197
2454550.83340     +1.263   0.018       197
2454550.83519     +1.268   0.018       197
2454550.83720     +1.306   0.016       197
2454550.83899     +1.256   0.015       197
2454550.84078     +1.272   0.016       197
2454550.84259     +1.239   0.016       197
2454550.84439     +1.245   0.015       197
2454550.84660     +1.271   0.015       197
2454550.84839     +1.246   0.015       197
2454550.85020     +1.227   0.015       197
2454550.85198     +1.218   0.014       197
2454550.85375     +1.225   0.015       197
2454550.85572     +1.240   0.015       197
2454550.85751     +1.218   0.014       197
2454550.85929     +1.247   0.015       197
2454550.86108     +1.220   0.015       197
2454550.86287     +1.245   0.016       197
2454550.86507     +1.209   0.016       197
2454550.86684     +1.216   0.017       197
2454550.86862     +1.253   0.018       197
2454550.87039     +1.236   0.017       197
2454550.87217     +1.218   0.016       197
2454550.87414     +1.288   0.016       197
2454550.87591     +1.259   0.016       197
2454550.87770     +1.289   0.016       197
2454550.87948     +1.270   0.016       197
2454550.89258     +1.322   0.017       197
2454550.89455     +1.357   0.017       197
2454550.89633     +1.365   0.017       197
2454550.89810     +1.374   0.017       197
2454550.89989     +1.379   0.017       197
2454550.90168     +1.402   0.017       197
2454550.90362     +1.376   0.017       197
2454550.90540     +1.402   0.017       197
2454550.90718     +1.426   0.018       197
2454550.90897     +1.419   0.018       197
2454550.91075     +1.439   0.018       197
2454550.91291     +1.452   0.019       197
2454550.91468     +1.510   0.022       197
2454550.91647     +1.513   0.023       197
2454550.91824     +1.499   0.022       197
2454550.92005     +1.530   0.021       197
2454550.92221     +1.566   0.021       197
2454550.92400     +1.525   0.021       197
2454550.92580     +1.591   0.023       197
2454550.92760     +1.604   0.024       197
2454550.92939     +1.626   0.025       197
2454550.93153     +1.614   0.027       197
2454550.93332     +1.631   0.029       197
2454550.93511     +1.664   0.030       197
2454550.93690     +1.684   0.030       197
2454550.93868     +1.641   0.031       197
2454550.94060     +1.771   0.035       197
2454550.94237     +1.725   0.035       197
2454550.94416     +1.743   0.038       197
2454550.94596     +1.777   0.034       197
2454550.94776     +1.741   0.035       197
2454550.94968     +1.720   0.034       197
2454550.95147     +1.740   0.035       197
2454550.95325     +1.715   0.034       197
2454550.95503     +1.697   0.035       197
2454550.95683     +1.747   0.039       197
2454550.95897     +1.768   0.035       197
2454550.96076     +1.721   0.034       197
2454550.96255     +1.704   0.036       197
2454550.96432     +1.612   0.035       197
2454550.96611     +1.605   0.033       197
2454550.96825     +1.664   0.039       197
2454550.97004     +1.724   0.050       197
2454550.97181     +1.757   0.058       197
2454550.97360     +1.592   0.048       197
2454550.97538     +1.527   0.044       197
2454550.97749     +1.577   0.046       197
2454551.67465     +1.563   0.028       198
2454551.67648     +1.427   0.032       198
2454551.67830     +1.559   0.043       198
2454551.68013     +1.569   0.045       198
2454551.68195     +1.598   0.047       198
2454551.68471     +1.651   0.037       198
2454551.68653     +1.555   0.029       198
2454551.68836     +1.645   0.030       198
2454551.69018     +1.598   0.023       198
2454551.69201     +1.645   0.023       198
2454551.69479     +1.650   0.023       198
2454551.69662     +1.656   0.023       198
2454551.69844     +1.682   0.024       198
2454551.70027     +1.749   0.024       198
2454551.70210     +1.685   0.022       198
2454551.70484     +1.746   0.023       198
2454551.70666     +1.757   0.022       198
2454551.70849     +1.772   0.022       198
2454551.71032     +1.708   0.021       198
2454551.71214     +1.717   0.021       198
2454551.71487     +1.778   0.023       198
2454551.71670     +1.741   0.021       198
2454551.71853     +1.731   0.020       198
2454551.72035     +1.711   0.020       198
2454551.72218     +1.778   0.021       198
2454551.72490     +1.737   0.021       198
2454551.72673     +1.759   0.021       198
2454551.72856     +1.768   0.021       198
2454551.73038     +1.699   0.020       198
2454551.73221     +1.762   0.021       198
2454551.73497     +1.698   0.019       198
2454551.73680     +1.747   0.020       198
2454551.73862     +1.731   0.019       198
2454551.74045     +1.624   0.018       198
2454551.74228     +1.603   0.017       198
2454551.74478     +1.583   0.017       198
2454551.74661     +1.600   0.017       198
2454551.74843     +1.599   0.017       198
2454551.75026     +1.546   0.016       198
2454551.75209     +1.519   0.015       198
2454551.75481     +1.529   0.016       198
2454551.75663     +1.516   0.015       198
2454551.75846     +1.474   0.015       198
2454551.76029     +1.448   0.015       198
2454551.76211     +1.419   0.014       198
2454551.76456     +1.453   0.015       198
2454551.76638     +1.425   0.014       198
2454551.76821     +1.415   0.015       198
2454551.77003     +1.403   0.015       198
2454551.77186     +1.396   0.015       198
2454551.77460     +1.377   0.014       198
2454551.77643     +1.359   0.015       198
2454551.77825     +1.329   0.014       198
2454551.78008     +1.339   0.014       198
2454551.78190     +1.303   0.014       198
2454551.78462     +1.325   0.014       198
2454551.78644     +1.284   0.014       198
2454551.78827     +1.269   0.014       198
2454551.79010     +1.269   0.014       198
2454551.79192     +1.265   0.013       198
2454551.79465     +1.250   0.013       198
2454551.79648     +1.259   0.014       198
2454551.79830     +1.235   0.013       198
2454551.80013     +1.253   0.013       198
2454551.80195     +1.227   0.014       198
2454551.80466     +1.243   0.014       198
2454551.80647     +1.217   0.014       198
2454551.80829     +1.240   0.014       198
2454551.81012     +1.229   0.014       198
2454551.81194     +1.220   0.014       198
2454551.81464     +1.212   0.014       198
2454551.81647     +1.246   0.014       198
2454551.81829     +1.258   0.015       198
2454551.82012     +1.214   0.015       198
2454551.82192     +1.236   0.015       198
2454551.82438     +1.254   0.015       198
2454551.82620     +1.243   0.015       198
2454551.82803     +1.273   0.015       198
2454551.82986     +1.243   0.015       198
2454551.83168     +1.243   0.015       198
2454551.83438     +1.277   0.015       198
2454551.83621     +1.281   0.015       198
2454551.83801     +1.284   0.015       198
2454551.83983     +1.272   0.015       198
2454551.84166     +1.284   0.015       198
2454551.84437     +1.308   0.015       198
2454551.84620     +1.318   0.015       198
2454551.84802     +1.313   0.015       198
2454551.84985     +1.316   0.015       198
2454551.85167     +1.340   0.016       198
2454551.85436     +1.352   0.016       198
2454551.85617     +1.374   0.016       198
2454551.85799     +1.370   0.016       198
2454551.85979     +1.345   0.016       198
2454551.86162     +1.400   0.017       198
2454551.86401     +1.423   0.018       198
2454551.86584     +1.422   0.018       198
2454551.86764     +1.454   0.018       198
2454551.86947     +1.418   0.018       198
2454551.87129     +1.481   0.019       198
2454551.87371     +1.500   0.019       198
2454551.87553     +1.498   0.019       198
2454551.87735     +1.531   0.019       198
2454551.87916     +1.500   0.019       198
2454551.88657     +1.601   0.021       198
2454551.88837     +1.620   0.021       198
2454551.89018     +1.651   0.022       198
2454551.89200     +1.672   0.022       198
2454551.89468     +1.699   0.023       198
2454551.89650     +1.677   0.022       198
2454551.89831     +1.755   0.024       198
2454551.90013     +1.726   0.024       198
2454551.90193     +1.732   0.024       198
2454551.90434     +1.785   0.025       198
2454551.90616     +1.752   0.025       198
2454551.90797     +1.756   0.025       198
2454551.90977     +1.774   0.026       198
2454551.91159     +1.751   0.025       198
2454551.91419     +1.724   0.025       198
2454551.91597     +1.745   0.025       198
2454551.91777     +1.725   0.025       198
2454551.91960     +1.709   0.025       198
2454551.92143     +1.732   0.026       198
2454551.92407     +1.707   0.026       198
2454551.92590     +1.691   0.025       198
2454551.92770     +1.661   0.025       198
2454551.92953     +1.632   0.024       198
2454551.93135     +1.583   0.024       198
2454551.93378     +1.617   0.025       198
2454551.93561     +1.535   0.024       198
2454551.93744     +1.561   0.024       198
2454551.93923     +1.599   0.025       198
2454551.94106     +1.532   0.024       198
2454551.94374     +1.542   0.025       198
2454551.94554     +1.506   0.024       198
2454551.94737     +1.526   0.025       198
2454551.94919     +1.501   0.024       198
2454551.95100     +1.444   0.023       198
2454551.95339     +1.480   0.024       198
2454551.95520     +1.413   0.023       198
2454551.95702     +1.436   0.024       198
2454551.95883     +1.350   0.022       198
2454551.96065     +1.393   0.023       198
2454551.96305     +1.364   0.023       198
2454551.96488     +1.326   0.023       198
2454551.96671     +1.319   0.023       198
2454551.96851     +1.286   0.024       198
2454551.97033     +1.328   0.025       198
2454551.97297     +1.280   0.025       198
2454551.97477     +1.303   0.027       198
2454553.65668     +1.614   0.031       200
2454553.66161     +1.508   0.026       200
2454553.66563     +1.569   0.026       200
2454553.66967     +1.500   0.024       200
2454553.67367     +1.506   0.023       200
2454553.67766     +1.458   0.022       200
2454553.68242     +1.436   0.021       200
2454553.68641     +1.428   0.021       200
2454553.69040     +1.403   0.019       200
2454553.69439     +1.294   0.017       200
2454553.69833     +1.290   0.017       200
2454553.70303     +1.293   0.017       200
2454553.70696     +1.245   0.015       200
2454553.71093     +1.289   0.015       200
2454553.71491     +1.229   0.015       200
2454553.71886     +1.209   0.014       200
2454553.72355     +1.227   0.014       200
2454553.72751     +1.236   0.014       200
2454553.73146     +1.250   0.014       200
2454553.73536     +1.247   0.013       200
2454553.73930     +1.253   0.013       200
2454553.74372     +1.245   0.013       200
2454553.74768     +1.260   0.013       200
2454553.75160     +1.265   0.013       200
2454553.75557     +1.327   0.014       200
2454553.75948     +1.309   0.013       200
2454553.76392     +1.371   0.014       200
2454553.76784     +1.398   0.014       200
2454553.77173     +1.423   0.014       200
2454553.77566     +1.407   0.013       200
2454553.77961     +1.445   0.014       200
2454553.78417     +1.479   0.014       200
2454553.78809     +1.531   0.015       200
2454553.79200     +1.568   0.015       200
2454553.79592     +1.601   0.015       200
2454553.79980     +1.636   0.015       200
2454553.80417     +1.670   0.016       200
2454553.80807     +1.685   0.016       200
2454553.81199     +1.764   0.017       200
2454553.81590     +1.741   0.017       200
2454553.81978     +1.763   0.017       200
2454553.82430     +1.780   0.017       200
2454553.82819     +1.775   0.017       200
2454553.83206     +1.757   0.017       200
2454553.83592     +1.712   0.016       200
2454553.83980     +1.686   0.016       200
2454553.84430     +1.640   0.016       200
2454553.84821     +1.589   0.016       200
2454553.85208     +1.631   0.016       200
2454553.85594     +1.553   0.016       200
2454553.85979     +1.521   0.016       200
2454553.86403     +1.521   0.016       200
2454553.86789     +1.437   0.015       200
2454553.87174     +1.424   0.015       200
2454553.87767     +1.395   0.015       202
2454553.88152     +1.340   0.014       202
2454553.88629     +1.303   0.014       202
2454553.89017     +1.300   0.014       202
2454553.89399     +1.251   0.014       202
2454553.89784     +1.250   0.014       202
2454553.90170     +1.253   0.014       202
2454553.90614     +1.227   0.014       202
2454553.90998     +1.213   0.014       202
2454553.91380     +1.230   0.014       202
2454553.91764     +1.232   0.015       202
2454553.92147     +1.217   0.015       202
2454553.92591     +1.234   0.015       202
2454553.92975     +1.235   0.015       202
2454553.93358     +1.250   0.016       202
2454553.93743     +1.251   0.016       202
2454553.94126     +1.305   0.017       202
2454553.94565     +1.260   0.017       202
2454553.94948     +1.339   0.019       202
2454553.95329     +1.376   0.021       202
2454553.95714     +1.348   0.020       202
2454553.96092     +1.408   0.022       202
2454553.96508     +1.416   0.022       202
2454553.96887     +1.385   0.022       202
 
END OF FIXED DATA SECTION. DO NOT MAKE ANY CHANGES ABOVE THIS LINE.

 

 

 

Contents © 2008 James W Brinsfield / Via Capote Observatory