David's Astronomy Pages
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 Images (S304) |
 Images Sessions |
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 Images (S306) |
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Objects Session Notes
DY Per - RCB Variable Star SS Cyg - Dwarf Nova Astrometric & Photometric Monitoring - SS Cyg (dwarf nova)
- R CrB, RU Peg, DY Per (variables)- SAO 70474 attempt failed (due to cloud)
- Short evening session (1.4 hrs), cut short by developing cloud. - Ambient Temperature 11.5 degC . - CCD operation of -15 degC
(at 72% average cooling).- main objective of the session was to acquire images of key selected stars for ongoing photometric and astrometric analysis. - a secondary objective, to test revised routine for automated guiding between frames, was not possible due to early termination of the session. -
| DY Per (Perseus) Images from the last three session (2008-09-21, 2008-09-22 & 2008-09-25) suggest that DY Per has begun a dimming event. At mag +11.8 (V), the star is around 0.4 mag dimmer than it was 15 days ago and around 1.1 mag dimmer than it was 10 months ago. (At this stage it is impossible to say whether the decline will be shallow or deep. It may dim to mag +13/+14 or even as low as +15.5 !. (See Graph of DY Per on AAVSO - last 2000 days ) On the other-hand it may simply return to its previous brightness at around mag +11.5) (Progress will be tracked on DY Per section on Eruptive Variable Stars page) |
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Follow-up - 2008-10-11 (showing that September decline was part of significant downward trend) |
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| SS Cyg (Cygnus) Images from session S305 (2008-09-25) show an unexpected brightening in SS Cyg. The star normal enters a low 'normal' state for between 2 and 4 weeks before rising. Today's measure +11.0 (V) is unusual given it had been recently dimming and had reached +11.85 (V) just 3 days ago. (See Graph of SS Cyg on AAVSO - last 60 days ) (Progress will be tracked on SS Cyg / Cataclysmic Variable Stars page) |
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| SS Cyg - Follow up (2008-10-11) |
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Images collected for Astrometric Monitoring
of Nearby Stars Project
Images collected for Photometric Monitoring
of Variable Stars
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| This Web Page: | CCD Images - Session 305 (2008-09-25) |
| Last Updated : | 2015-05-16 |
| Site Owner : | David Richards |
| Home Page : | David's Astronomy Web Site |
