Return to Home Page
> Would someone try to coordinate this simultaneous observation? SS Aur is currently reported to be V=16 or fainter, providing the best opportunity!< I'm afraid this is yet another case of scatter being introduced into the data by the use of different sequences to some extent. Simultaneous observations by observers using divergent sequences will not clarify the situation. As was discussed regarding SU UMa recently, the older AAVSO sequences are usually not accurate in the faint end. I do not have a copy of the BAAVSS chart so I cannot speak to the sequence accuracy there, but below is a table comparing the current AAVSO CCD chart mags to the AAVSO visual sequence and Henden photometry. (Why the AAVSO has a different sequence for CCD vs. visual, and has not adopted the Henden photometry is beyond my understanding) The AAVSO CCD sequence does not utilize the same comp stars for anything fainter than 14.6V. The AAVSO visual sequence is 0.2V too bright. I suspect the BAAVSS chart suffers from the same problem. CCD AAVSO HENDEN 11.0 108 109 12.5 125 124 13.2 132 131 14.0 139 139 14.6 145 146 15.1 NA NA 15.8 NA NA NA 148 152 NA 152 154 NA 158 NA NA NA 160 I can nearly always see the 152 or 154 Henden comp and rarely detect SS Aur. I have on occasion glimpsed the 160 Henden comp and not seen SS Aur. It is in fact one of the great disappointments I have experienced after upgrading to a larger telescope, that I still cannot see many of my program stars in quiescence. From previously existing data I expected to be able to see SS Aur and many others when faint, but rarely do. Mike Simonsen
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
