| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia[2] |
| AB | |
| Right ascension | 23h 30m 01.93946s[3] |
| Declination | +58° 32′ 56.1120″[3] |
| Apparent magnitude (V) | 4.883 (4.912 / 8.814)[4] |
| CD | |
| Right ascension | 23h 29m 52.2802s[5] |
| Declination | +58° 32′ 54.458″[5] |
| Apparent magnitude (V) | 7.09[6] |
| Characteristics | |
| AB | |
| Spectral type | B4 V + A6 V[4] |
| U−B color index | −0.62[7] |
| B−V color index | −0.12[7] |
| Variable type | Algol[8] |
| CD | |
| Spectral type | B9 V[6] |
| U−B color index | −0.14[7] |
| B−V color index | +0.01[7] |
| FG | |
| Spectral type | F7 IV + F9 V[9] |
| Astrometry | |
| Radial velocity (Rv) | −15.9±0.9[10] km/s |
| Proper motion (μ) | RA: 17.90[3] mas/yr Dec.: 4.15[3] mas/yr |
| Parallax (π) | 5.25 ± 0.52 mas[3] |
| Distance | 620 ± 60 ly (190 ± 20 pc) |
| Aa | |
| Absolute magnitude (MV) | −1.87±0.13[4] |
| Absolute bolometric magnitude (Mbol) | −3.56±0.13[4] |
| Ab | |
| Absolute magnitude (MV) | 2.20±0.11[4] |
| Absolute bolometric magnitude (Mbol) | 2.18±0.11[4] |
| Orbit[4] | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 6.0663170 d |
| Eccentricity (e) | 0.240 |
| Inclination (i) | 85.34±0.50° |
| Periastron epoch (T) | JD 2436847.9404±0.0055 |
| Argument of periastron (ω) (secondary) | 41.82±0.47° |
| Details[4] | |
| Aa | |
| Mass | 5.90±0.20 M☉ |
| Radius | 5.05±0.06 R☉ |
| Surface gravity (log g) | 3.80±0.02 cgs |
| Temperature | 17,200±500 K |
| Ab | |
| Mass | 1.86±0.06 M☉ |
| Radius | 1.60±0.03 R☉ |
| Surface gravity (log g) | 4.30±0.02 cgs |
| Temperature | 8,150±200 K |
| Other designations | |
| AR Cassiopeiae (AB): 1H. Cas[11], AR Cas, BD+57°2748, HD 221253, HIP 115990, HR 8926, SAO 35478[8] | |
| HD 221237 (CD): BD+57°2747, HD 221237, SAO 35476 | |
| FG: UCAC4 743-089692 | |
| Database references | |
| SIMBAD | AR Cas (AB) |
| CD | |
| D | |
| F | |
| G | |
AR Cassiopeiae (AR Cas) is a variable star in the constellation of Cassiopeia. It is thought to be a member of a septuple star system, one of only two known star systems with a multiplicity of 7, the other being Nu Scorpii.[12][9]
- ^ Cite error: The named reference
MASTwas invoked but never defined (see the help page). - ^ WikiSky, "HD 221253" (accessed 2010-10-27)
- ^ a b c d e van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b c d e f g h Holmgren, D. E.; Hadrava, P.; Harmanec, P.; Eenens, P.; Corral, L. J.; Yang, S.; Ak, H.; Bozić, H. (1999). "Search for forced oscillations in binaries. III. Improved elements and the detection of line-profile variability of the B4V + A6V: system AR Cassiopeiae". Astronomy and Astrophysics. 345: 855. Bibcode:1999A&A...345..855H.
- ^ a b Gaia Collaboration (2016). "Gaia Data Release 1". Astronomy & Astrophysics. 595: A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.
- ^ a b "HD 221237". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 August 2017.
- ^ a b c d Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ a b "V* AR Cas". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 23 August 2017.
- ^ a b Cite error: The named reference
MSCwas invoked but never defined (see the help page). - ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
- ^ Cite error: The named reference
Somervillewas invoked but never defined (see the help page). - ^ Cite error: The named reference
Eggletonwas invoked but never defined (see the help page).