SS Ursae Minoris
SS Ursae Minoris is a cataclysmic variable star system in the constellation Ursa Minor. It was discovered visually and by its X-ray emissions separately in 1982 before they were understood to be coming from the same object.[4] It is classified as a SU Ursae Majoris variable subclass of dwarf nova in that it has both 'normal' outbursts of increased brightness as well as even brighter 'superoutbursts'. However, unlike other SU Ursae Majoris stars, the superoutbursts are of longer duration than the regular outbursts.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Minor |
| Right ascension | 15h 51m 22.3401s[1] |
| Declination | +71° 45′ 11.8343″[1] |
| Characteristics | |
| Variable type | dwarf nova[2] |
| Astrometry | |
| Proper motion (μ) | RA: 13.085±0.080[1] mas/yr Dec.: −12.260±0.088[1] mas/yr |
| Parallax (π) | 1.8871 ± 0.0497[1] mas |
| Distance | 1,730 ± 50 ly (530 ± 10 pc) |
| Details | |
| Other designations | |
| Database references | |
| SIMBAD | data |
The two stars orbit each other every 98 minutes.[2]
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Chen, J.-S.; Liu, X.-W.; Wei, M.-Z. (1991). "CCD photometry of the SU Ursae Majoris cataclysmic variable SS Ursae Minoris (PG 1551 + 719)". Astronomy and Astrophysics. 242 (2): 397–400. Bibcode:1991A&A...242..397C. ISSN 0004-6361.
- "V* SS UMi". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-07.
- Udalski, A. (1990). "SS Ursae Minoris: a Normal U Gem Type Dwarf Nova". Information Bulletin on Variable Stars. 3425 (3425): 1–4. Bibcode:1990IBVS.3425....1U.
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