David's Astronomy Pages Images - Session 495 (2012-01-13)

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Images (S496)

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QSO APM 08279 +5255 - quasar (redshift z=3.87) Variable Stars Photometric Monitoring - Variables - RX And, U And, W And, Z And, BL Lac, FO Ori, FU Ori, DY Per, GK Per, RR Tau     Astrometric Monitoring - Nearby Stars - None

- Late evening session. Very good sky conditions and no wind. Session ended when observatory laptop hung in mid session - reason unknown. - Session parts operated under semi-automated control, with remote monitoring from indoors computer.    - Ambient Temperature: -3°C (minimum)  - CCD operation -30°C (at 61% average cooling).   - main objective of the session was to acquire images of distant quasar QSO APM 08279 +05255 (redshift, z= 3.87) and images of selected project stars for ongoing photometric analysis  -

QSO APM 08279 +5255 - quasar (redshift z = 3.87)

QSO APM 08279 +5255 (Lynx)   Quasar is marked by white cross-hairs. Estimated magnitude +15.7  Only discovered in 1998, it is very remote object with catalog redshift of 3.87 Discovery Paper : THE ASTROPHYSICAL JOURNAL 505:529-535, 1998 October 1 Four or five foreground galaxies are visible in same image. These include  PGC 2423692 (catalog mag +17.3) & PGC 2421539 (catalog mag +17.3)

CCD Image (cropped) 6 x 90 sec exposure (average combine), 3x3 binning, C Filter  2012-01-13 23:22 h UT  (#495025-30) 12" LX200R  (at f/9.7) + ST-10XME [ See spectra with calculation of redshift of this quasar by Robin Leadbeater at http://www.threehillsobservatory.co.uk/astro/spectra_22.htm ]

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