April 17, 2008
V2491 Cyg (Nova Cyg 2008 #2) now has a two-night BVRI photometric calibration from Sonoita Research Observatory. A sequence based on that calibration has been uploaded to VSP/VSD and is now available when you download a chart. This sequence should be adequate until the nova fades below V=13.5, at which time we will update the sequence. A .dat calibration file will be available shortly. Last reports to the AAVSO show the nova at V=9.6, but relatively constant since the rapid fade from its peak at V=7.4. Lynch, et al. (IAUC 8935) indicate that this nova has a highly unusual spectrum. Ibarra and Kuulkers (ATEL 1473, 1480) point out that this nova has been an X-ray source for several years and is being followed currently with Swift. Continue observing this peculiar nova! Arne Henden --------------------------------------------------- SUBMIT OBSERVATIONS TO THE AAVSO Information on submitting observations to the AAVSO may be found at: http://www.aavso.org/observing/submit/ SPECIAL NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION A Special Notice archive is available at the following URL: http://www.aavso.org/publications/specialnotice/ Subscribing and Unsubscribing may be done at the following URL: http://www.aavso.org/publications/email/