Epoch J2000 Equinox J2000
|Right ascension||23h 12m 05.9361s|
|Declination||+43° 28′ 19.4899″|
|Apparent magnitude (V)||6.3 - 18.0|
|Proper motion (μ)|| RA: −1.944±0.211 mas/yr |
Dec.: −0.368±0.204 mas/yr
|Parallax (π)||0.1378 ± 0.1377 mas|
|Absolute magnitude (MV)||−7.56 - +3.3|
|Luminosity||84,000 (max) L☉|
OS Andromedae, known also as Nova Andromedae 1986, is a classical nova that appeared in the constellation Andromeda during 1986. It reached a peak apparent visual magnitude of 6.3 and had an intrinsic decay time (for a three magnitude drop) of 25 days. At the estimated distance of 4.2 kiloparsec, its absolute magnitude at the peak was -7.56.
OS Andromedae was discovered when it was at 8th magnitude on December 5th. It reached its peak brightness two days later A sudden decrease in visual and ultraviolet light, which occurred 30 days after the peak, was due to dust formation during the nova event. It was estimated that 3.5×10−5 M☉ was ejected during the event. The chemical composition is typical of a CO nova.
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