AR Cassiopeiae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia |
| AB | |
| Right ascension | 23h 30m 01.93946s |
| Declination | +58° 32′ 56.1120″ |
| Apparent magnitude (V) | 4.883 (4.912 / 8.814) |
| C | |
| Right ascension | 23h 29m 52.27982s |
| Declination | +58° 32′ 54.4530″ |
| Apparent magnitude (V) | 7.23±0.01 |
| D | |
| Right ascension | 23h 29m 52.18197s |
| Declination | +58° 32′ 53.3423″ |
| Apparent magnitude (V) | 9.00 - 9.05 |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
| Constellation | Cassiopeia |
| F | |
| Right ascension | 23h 29m 58.79260s |
| Declination | +58° 33′ 58.3908″ |
| G | |
| Right ascension | 23h 30m 00.11097s |
| Declination | +58° 34′ 01.5021″ |
| Characteristics | |
| AB | |
| Spectral type | B4 V + A6 V |
| U−B color index | −0.62 |
| B−V color index | −0.12 |
| Variable type | Algol |
| CD | |
| Spectral type | B9 V |
| U−B color index | −0.14 |
| B−V color index | +0.01 |
| FG | |
| Evolutionary stage | main sequence |
| Spectral type | F7 IV + F9 V |
| Astrometry | |
| Radial velocity (Rv) | −15.9±0.9 km/s |
| Proper motion (μ) | RA: 17.90 mas/yr Dec.: 4.15 mas/yr |
| Parallax (π) | 5.25±0.52 mas |
| Distance | 620 ± 60 ly (190 ± 20 pc) |
| Aa | |
| Absolute magnitude (MV) | −1.87±0.13 |
| Absolute bolometric magnitude (Mbol) | −3.56±0.13 |
| Ab | |
| Absolute magnitude (MV) | 2.20±0.11 |
| Absolute bolometric magnitude (Mbol) | 2.18±0.11 |
| C | |
| Proper motion (μ) | RA: 18.797±0.024 mas/yr Dec.: 1.953±0.024 mas/yr |
| Parallax (π) | 4.7329±0.0236 mas |
| Distance | 689 ± 3 ly (211 ± 1 pc) |
| D | |
| Proper motion (μ) | RA: 20.435±0.059 mas/yr Dec.: 1.802±0.051 mas/yr |
| Parallax (π) | 4.6548±0.0362 mas |
| Distance | 701 ± 5 ly (215 ± 2 pc) |
| F | |
| Radial velocity (Rv) | −12.86±1.18 km/s |
| Proper motion (μ) | RA: 20.240±0.011 mas/yr Dec.: 1.884±0.011 mas/yr |
| Parallax (π) | 4.7301±0.0109 mas |
| Distance | 690 ± 2 ly (211.4 ± 0.5 pc) |
| G | |
| Radial velocity (Rv) | −13.20±1.65 km/s |
| Proper motion (μ) | RA: 20.452±0.016 mas/yr Dec.: 2.050±0.014 mas/yr |
| Parallax (π) | 4.7539±0.0138 mas |
| Distance | 686 ± 2 ly (210.4 ± 0.6 pc) |
| Orbit | |
| Primary | Aa |
| Name | 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 | |
| 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 |
| C | |
| Mass | 3.125±0.046 M☉ |
| Radius | 2.415+0.053 −0.054 R☉ |
| Luminosity | 112.2±2.2 L☉ |
| Temperature | 12,083 K |
| D | |
| Temperature | 5,095 K |
| F | |
| Mass | 1.139±0.040 M☉ |
| Radius | 1.139±0.023 R☉ |
| Luminosity | 1.666+0.011 −0.010 L☉ |
| Temperature | 6098+27 −26 K |
| G | |
| Mass | 1.044+0.040 −0.041 M☉ |
| Radius | 1.144±0.012 R☉ |
| Luminosity | 1.493+0.014 −0.015 L☉ |
| Temperature | 5934±67 K |
| Other designations | |
| ADS 16795, CCDM J23300+5833, WDS J23300+5833 | |
| AR Cassiopeiae (AB): 1H. Cas, AR Cas, BD+57°2748, HD 221253, HIP 115990, HR 8926, SAO 35478 | |
| HD 221237 (CD): BD+57°2747, HD 221237, SAO 35476 | |
| FG: UCAC4 743-089692 | |
| Database references | |
| SIMBAD | AR Cas (AB) |
| CD | |
| C | |
| 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.