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.
V420 Aur
Special Notice #175: Request for observations of high-mass X-ray binaries
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AAVSO Special Notice #175
Request fo
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
Special Notice #186: Request for observations of high-mass X-ray binaries
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AAVSO Special Notice #186
Request fo
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
Alert Notice 554: Observations of V420 Aur (HD 34921) needed to support spectroscopy
Note added October 4, 2016: In the original version of this Alert Notice, V420 Aur was referred to as V420 Oph in the sections on creating charts and reporting observations. Also, the range was given as V=7.15-7.35 when the correct value is V=7.35-7.51. The text below has been corrected. Apologies to the PI's for the error.