 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 12m 05.936s[1] |
| Declination | +47° 28′ 19.49″[1] |
| Apparent magnitude (V) | 6.3 - 18.0[2] |
| Characteristics | |
| Variable type | Nova[3] |
| Astrometry | |
| Proper motion (μ) | RA: −1.944±0.211[1]mas/yr Dec.: −0.368±0.204[1]mas/yr |
| Parallax (π) | 0.1378±0.1377 mas[1] |
| Distance | 3298+1670 −524[3] pc |
| Absolute magnitude (MV) | −7.56[4] -+3.3[5] |
| Details | |
| White dwarf | |
| Mass | 1.0[4] M☉ |
| Luminosity | 84,000 (max)[4] L☉ |
| Donor star | |
| Other designations | |
| AAVSO 2307+46, Nova And 1986,Gaia DR2 1942264441241366144[3][6] | |
| Database references | |
| SIMBAD | data |
OS Andromedae, known also asNova Andromedae 1986, is aclassical nova that appeared in the constellationAndromeda during 1986. It was discovered at 10:34 UT on 5 December 1986 by Mitsuri Suzuki, a 28-year-old school teacher living inEna, Japan. He photographed the portion of theMilky Way that passes through northern Andromeda with a 200-mm telephoto lens, and found the nova when itsapparent magnitude was 8.0. Two days later it reached a peakapparent visual magnitude of 6.3.[7][5]
OS Andromedae had an intrinsic decay time (for a three magnitude drop) of 25 days, making it a "fast" nova. A sudden decrease in visual andultraviolet light, which occurred 30 days after the peak, was due to dust formation during the nova event. The mass of the white dwarf has been estimated to be 1.05M☉[8] and it was estimated that 3.5×10−5M☉ was ejected during the event. The chemical composition is typical of a CO nova.[4] At the estimated distance of 4.2 kiloparsec, itsabsolute magnitude at the peak was -7.56.[4]
