Special Notice #118: Request extended to observe High-Mass X-Ray Binaries (HMXBs) in support of radial velocity observations
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HMXB campaign extended until further notice.
HMXB
Special Notice #129: Request extended to observe High-Mass X-Ray Binaries (HMXBs) in support of radial velocity observations
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HMXB campaign extended until further notice.
Special Notice #143: Request extended to observe High-Mass X-Ray Binaries (HMXBs) in support of radial velocity observations
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HMXB campaign extended until further notice.
Special Notice #146: Request to monitor the candidate high-mass X-ray binary BG Gem
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AAVSO Special Notice #146
Request to
Special Notice #159: Request for observations of high-mass X-ray binaries
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AAVSO Special Notice #159
Request fo
Special Notice #163: Request for observations of high-mass X-ray binaries
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AAVSO Special Notice #163
Request fo
Special Notice #175: Request for observations of high-mass X-ray binaries
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AAVSO Special Notice #175
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Special Notice #180: Request for observations of V420 Aur in support of Spitzer Space Telescope observations
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AAVSO Special Notice #180
Request fo
Alert Notice 559: Observations of CI Cam needed to support spectroscopy
October 19, 2016: Kelly Gourdji and Marcella Wijngaarden (graduate students at the University of Amsterdam/Anton Pannekoek Institute for Astronomy) have requested AAVSO observers' assistance in providing optical photometry of CI Cam in support of their high-resolution spectroscopy with the Mercator telescope + Hermes spectrograph in La Palma from now through January 2017.
Alert Notice 555: Correction to Alert Notice 554 on V420 Aur (HD 34921)
October 4, 2016: In AAVSO Alert Notice 554 the star was inadvertently referred to as V420 Oph in the sections creating charts and reporting observations.
Charts with a comparison star sequence for V420 Aur may be created using the AAVSO Variable Star Plotter (VSP).
Please submit observations to the AAVSO International Database using the name V420 AUR.
Coordinates for V420 Aur (2000.0): R.A. 05 22 35.23 Dec. +37 40 33.6