![]() A light curve for 4 Cassiopeiae, plotted from Hipparcos data. [1] The assumed period is from Koen and Eyer (2002). [2] | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 23h 24m 50.26237s [3] |
Declination | +62° 16′ 58.1094″ [3] |
Apparent magnitude (V) | 4.96 [4] (4.95 – 5.00) [5] |
Characteristics | |
Evolutionary stage | AGB [6] |
Spectral type | M2− IIIab [4] |
B−V color index | 1.676±0.010 [4] |
Variable type | suspected [5] |
Astrometry | |
Radial velocity (Rv) | −38.99±0.23 [7] km/s |
Proper motion (μ) |
RA: +12.29
[3]
mas/
yr Dec.: −12.44 [3] mas/ yr |
Parallax (π) | 4.15 ± 0.21 mas [3] |
Distance | 790 ± 40
ly (240 ± 10 pc) |
Absolute magnitude (MV) | −1.94 [4] |
Details | |
Mass | 2.3 [8] M☉ |
Radius | 78 [9] R☉ |
Luminosity | 1,419 [9] L☉ |
Temperature | 4,000 [9] K |
Other designations | |
Database references | |
SIMBAD | data |
4 Cassiopeiae is a red giant in the northern constellation of Cassiopeia, [10] located approximately 790 light-years away from the Sun. [3] It is visible to the naked eye as a faint, red-hued star with a baseline apparent visual magnitude of 4.96. [4] At the distance of this system, its visual magnitude is diminished by an extinction of 0.56 due to interstellar dust. [11] This system is moving closer to the Earth with a heliocentric radial velocity of −39 km/s. [7]
An evolved red giant star, currently on the asymptotic giant branch, [6] 4 Cassiopeiae has a stellar classification of M2− IIIab. [4] It is a suspected variable star of unknown type with a brightness that varies from visual magnitude 4.95 down to 5.00. [5]
Multiple star catalogues list a number of companions to 4 Cassiopeiae, all unrelated stars at different distances. [12] As of 2011, the magnitude 9.88 component B lay at an angular separation of 96.10 ″ along a position angle of 226° relative to the primary. Components C, E, F, and G are all fainter and more than two arc-minutes from 4 Cassiopeiae, and components C and G are themselves close doubles. [13]
4 Cassiopeiae is 40' north of the open cluster Messier 52, near the constellation border with Cepheus, although it is not a member of the cluster. [14]
![]() A light curve for 4 Cassiopeiae, plotted from Hipparcos data. [1] The assumed period is from Koen and Eyer (2002). [2] | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 23h 24m 50.26237s [3] |
Declination | +62° 16′ 58.1094″ [3] |
Apparent magnitude (V) | 4.96 [4] (4.95 – 5.00) [5] |
Characteristics | |
Evolutionary stage | AGB [6] |
Spectral type | M2− IIIab [4] |
B−V color index | 1.676±0.010 [4] |
Variable type | suspected [5] |
Astrometry | |
Radial velocity (Rv) | −38.99±0.23 [7] km/s |
Proper motion (μ) |
RA: +12.29
[3]
mas/
yr Dec.: −12.44 [3] mas/ yr |
Parallax (π) | 4.15 ± 0.21 mas [3] |
Distance | 790 ± 40
ly (240 ± 10 pc) |
Absolute magnitude (MV) | −1.94 [4] |
Details | |
Mass | 2.3 [8] M☉ |
Radius | 78 [9] R☉ |
Luminosity | 1,419 [9] L☉ |
Temperature | 4,000 [9] K |
Other designations | |
Database references | |
SIMBAD | data |
4 Cassiopeiae is a red giant in the northern constellation of Cassiopeia, [10] located approximately 790 light-years away from the Sun. [3] It is visible to the naked eye as a faint, red-hued star with a baseline apparent visual magnitude of 4.96. [4] At the distance of this system, its visual magnitude is diminished by an extinction of 0.56 due to interstellar dust. [11] This system is moving closer to the Earth with a heliocentric radial velocity of −39 km/s. [7]
An evolved red giant star, currently on the asymptotic giant branch, [6] 4 Cassiopeiae has a stellar classification of M2− IIIab. [4] It is a suspected variable star of unknown type with a brightness that varies from visual magnitude 4.95 down to 5.00. [5]
Multiple star catalogues list a number of companions to 4 Cassiopeiae, all unrelated stars at different distances. [12] As of 2011, the magnitude 9.88 component B lay at an angular separation of 96.10 ″ along a position angle of 226° relative to the primary. Components C, E, F, and G are all fainter and more than two arc-minutes from 4 Cassiopeiae, and components C and G are themselves close doubles. [13]
4 Cassiopeiae is 40' north of the open cluster Messier 52, near the constellation border with Cepheus, although it is not a member of the cluster. [14]