Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda [1] |
ADS 48 A | |
Right ascension | 00h 05m 41.0219s [2] |
Declination | +45° 48′ 43.545″ [2] |
Apparent magnitude (V) | 8.826 [3] |
ADS 48 B | |
Right ascension | 00h 05m 41.0028s [4] |
Declination | +45° 48′ 37.354″ [4] |
Apparent magnitude (V) | 8.995 [3] |
Characteristics | |
ADS 48 A | |
Spectral type | K6V [5] |
B−V color index | +1.344 [3] |
ADS 48 B | |
Spectral type | M0.5V [5] |
B−V color index | +1.345 [3] |
Astrometry | |
Radial velocity (Rv) | 1.49±0.1 [6] km/s |
Proper motion (μ) | RA: 887.48±1.02 [7] mas/yr Dec.: −152.02±1.04 [7] mas/yr |
Parallax (π) | 88.44±1.56 mas [7] |
Distance | 36.9 ± 0.7 ly (11.3 ± 0.2 pc) |
Absolute magnitude (MV) | +7.93 [1] |
Orbit [8] | |
Period (P) | 557±120 yr |
Semi-major axis (a) | 74±10 AU |
Eccentricity (e) | 0.19±0.08 |
Inclination (i) | 54.3±2.3° |
Longitude of the node (Ω) | 12.5±2.8° |
Periastron epoch (T) | 2110±30 |
Argument of periastron (ω) (secondary) | 256±31° |
Details | |
ADS 48 A | |
Mass | 0.50 [9] M☉ |
ADS 48 B | |
Mass | 0.53 [9] M☉ |
Other designations | |
HD 38, HIP 473, GJ 4, CCDM J00057+4548AB, WDS J00057+4549AB | |
ADS 48 A: HD 38A, SAO 36046, GC 71, GJ 4 A, CCDM J00057+4548A, WDS J00057+4549A | |
ADS 48 B: HD 38B, SAO 36048, GC 72, GJ 4 B, CCDM J00057+4548B, WDS J00057+4549B | |
Database references | |
SIMBAD | AB |
A | |
B |
ADS 48 is a binary system in the constellation of Andromeda.
The components have apparent visual magnitudes of 8.826 and 8.995. [3] Component A is a K-type main-sequence star, while component B is an M-type main-sequence star (red dwarf). [5] The stars are orbiting with a period of 550 years and a separation of 74 AU . [8]
Multiple stars lie close to ADS 48 in the line of sight, and have been considered components C, D and E of the system, but are background objects. ADS 48 F is at a similar distance from the pair and share similar proper motions, but is moving faster than the escape velocity of the pair and thus is not gravitationally bound. [10] It has also been proposed the existence of an unseen companion of 0.05 M☉, [9] but this was refuted. [8]