David's Astronomy Pages Images - Session 584 (2015-04-17)

Images (S583)

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Images (S585)

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Session Notes

NGC 2129 - Open Cluster (Herschel VIII-26) NGC 3384 - Elliptical Galaxy     Photometric Monitoring - Variables   - U Gem, RZ LMi, DY Per, GK Per, ER UMa     Astrometric Monitoring - Nearby Stars   - DX Cnc (Gliese 1111), CN Leo (Wolf 359)

- Short evening session (1.3 hrs duration).  Whilst conditions (clear, windless, excellent seeing) were initially very promising for a a good night of observing  sky transparency rapidly degraded and observing had to be quickly abandoned. - Session operated under semi-automated control, with remote monitoring from indoors computer.   - Ambient Temperature:  tube temperature rapidly fell from +10°  to +1.5°C (minimum) - CCD operation -25°C (at 65% average cooling).  - Planned objectives of the session were to monitor selected variable stars & nearby stars and to take gallery images of selected deep sky objects  in Canes Venatici, Leo and Virgo. -   - Notes: RZ LMi images (90s, C filter, -25deg C) wouldn't link until after a Hot Pixel repair operation is performed.

NGC 2129 - Open Cluster (Herschel VIII-26)

NGC 2129 / Herschel VIII-26 (Gemini) (near border with Taurus)

CCD Image (50% size) 4 x 20s sec exposure (average combine), 3x3 binning, C Filter 2014-12-17 21:33 h UT (#584021-25) 12" LX200R  (at f/10.4) + ST-10XME [larger image 75% size ]

NGC 2129 / Herschel VIII-26 - Earlier Image

CCD Image (50% size) 7 x 30s sec exposure (average combine), 3x3 binning, C Filter 2014-12-04 01:45 h UT (#574433-39) 12" LX200R  (at f/10.4) + ST-10XME [larger image 75% size ]

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NGC 3384 - Elliptical Galaxy

NGC 3384 (Leo) Image quality badly affected by poor sky transparency

CCD Image (cropped) 3 x 120s exposure (average combine), 3x3 binning, C Filter  2015-04-17 22:21 hUT (#584081-83) 12" LX200R  (at f/10.4) + ST-10XME

NGC 3384 - Earlier Image (2010) (acquired under better sky conditions)

CCD Image (cropped) 5  x 60s exposure (average combine), 3x3 binning, C Filter  2010-02-18 00:44 hUT (#413054-58) 12" LX200R  (at f/9.7) + ST-10XME

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