David's Astronomy Pages CCD Images - Session 50 (2003-08-08 / 2003-08-09) Images (S49)   Images (Main)   Home Page   Images (S51)

Notes (S00050)

Sky transparency was fairly poor, with despite the conditions a number of deep sky objects were imaged. 188 CCD frames were taken over a period of 5.2 hours, including a sequence of 103 images (60 sec exposures) of the minor planet Illapa (37655).

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IC 5146 (Cocoon Nebula) - Cluster with nebulosity

IC 5146 (in Cygnus)

CCD image,  4 x 60 sec exposures (summed & smoothed) 2003-08-08  23:12 to 23:18 h UT (#50014-17) 11.1 x 7.2 arc mins

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NGC 7331 (Deer Lick Group) - Spiral Galaxy / Galaxy cluster

Deer Lick Group  (in Pegasus) comprising NGC 7331 (catalog mag +10.3 ),  NGC 7335 (+14.3), NGC 7337 (+15.2)

CCD image,  7 x 300 sec exposures (average combine) 2003-08-08  23:41 to 2003-08-09  00:25 h UT (#50026-35) 11.4 x 7.6 arc mins

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NGC 7479 - Spiral Galaxy

NGC 7479  (in Pegasus)

CCD image,  5 x 60 sec exposures (summed) 2003-08-09  03:31 to 03:27 h UT (#50154-58) 11.4 x 7.6 arc mins

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Illapa (37655) - Minor Planet

Illapa  (moving into Aquarius) Composite image recorded over 2 hours  showing Illapa's rapid movement of 3.87 arc min per hour due to its close distance to Earth, 0.117 AU from Earth

CCD image,  108 x 60 sec exposures (summed) 2003-08-09  01:12 to 03:19h UT (#50049-152) 11.4 x 7.6 arc mins

Animated sequence of CCD Images showing movement of Illapa (37655)  click on image below to run animation

60 sec exposures 2003-08-09  01:08 to 03:16h UT (#50048-150)

Light curve for 37655 Illapa

Light Curve for 37655 Illapa, generated from 101 CCD Images (60 sec exposures)   taken over a period of 2 hours. The light curve records an apparent 0.3 mag variation  (unfiltered mag range of c. +15.25  to +15.5).  Possible trough at 02:15 to 02:20h UT, but unconfirmed due to time gap in images. Data quality isn't sufficient to be confident in  assessing a rotational period for the minor planet.   2003-08-09  01:08 to 03:16h UT (#50048-152)

See images of Illapa on 2003-08-03 when movement was recorded as 1.25 arc min per hour. 

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Linear Satellite / Meteor Tracks

During the course of 2 hours observation of Illapa(37655), 3 satellite or meteors crossed the CCD FOV (only 11.4 x 7.6 arc mins). This was quite unusual 

Linear track (1) (#50066)

Linear track 2 (#50095)

Linear track 3 (#50121)

CCD images,  60 sec exposures  11.4 x 7.6 arc mins

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