David's Astronomy Pages Images - Session 588 (2015-05-13)

Images (S587)

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Images (S589)

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Session Notes

NGC 4725 - Spiral Galaxy (Herschel I-84)     Photometric Monitoring - Variables   - U Gem, AC Her, DY Per, UV Per     Astrometric Monitoring - Nearby Stars   - CN Leo - DX Cnc attempt failed (due to cloud)

- Late evening session (1.0 hrs duration) cut short when sky transparency reduced / thin clouds - Session operated under semi-automated control, with remote monitoring from indoors computer.   - Ambient Temperature:  tube temperature fell to +2.0°C (minimum) before rising to +4.0° by end of session as cloud developed - CCD operation -30°C (at 76% average cooling).  - Planned objectives of the session were to monitor selected variable stars & nearby stars -

NGC 4725 - Spiral Galaxy (Herschel I-84)

NGC 4725 / Herschel I-84 (Coma Berenices) (Image taken under poor sky conditions)

CCD Image (linear scale, 50% size) 90s exposure (single fra,e), 3x3 binning, C Filter 2015-05-13 22:51 h UT (#588051) 12" LX200R  (at f/10.4) + ST-10XME

NGC 4725 / Herschel I-84 - Earlier Image (2015-04-20) (NGC 4725 taken under good sky conditions)

CCD Image (linear scale, 50% size) 5 x 90s exposure (average combine), 3x3 binning, C Filter 2015-04-20 23:56 h UT (#585082-88) 12" LX200R  (at f/10.4) + ST-10XME [larger image, 75% size]

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