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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ara |
| Right ascension | 16h40m 44.39899s[2] |
| Declination | −51° 28′ 41.7258″[2] |
| Apparent magnitude (V) | 6.30[3] |
| Characteristics | |
| Spectral type | A9 V[4]orF1 V nn m-4[5] |
| B−V color index | 0.321±0.006[6] |
| Variable type | γ Dor[3] |
| Astrometry | |
| Radial velocity (Rv) | 45.9±0.5[7] km/s |
| Proper motion (μ) | RA: +11.741[2] mas/yr Dec.: +131.264[2] mas/yr |
| Parallax (π) | 19.5759 ± 0.0521 mas[2] |
| Distance | 166.6 ± 0.4 ly (51.1 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.83[6] |
| Details | |
| Mass | 1.60[8] M☉ |
| Radius | 1.70+0.08 −0.12[2] R☉ |
| Luminosity | 6.27±0.02[2] L☉ |
| Surface gravity (log g) | 4.21±0.14[8] cgs |
| Temperature | 7,003+257 −159[2] K |
| Rotational velocity (v sin i) | 136[9] km/s |
| Age | 1.144[8] Gyr |
| Other designations | |
V872 Arae, NSV 20726, CD–51°10403, CPD–51°9815, HD 149989, HIP 81650, SAO 244058[10] | |
| Database references | |
| SIMBAD | data |
HD 149989 is a single,[3] variable star in the southern constellationofAra, located near the western constellation border with Norma. It has the variable star designation V872 Arae, while HD 149989 is the identifier from the Henry Draper Catalogue. This is a dim star near the lower limit of visibility to the naked eye with an apparent visual magnitude that fluctuates around 6.30.[3] It is located at a distance of 167 light years from the Sun based on parallax, and is drifting further away with a radial velocity of 46 km/s.[7]
This object is an A-type main-sequence star with a stellar classification of A9 V.[4] A 2016 survey of γ Doradus stars found a class of F1 V nn m-4, where the 'nn' indicates "nebulous" lines due to rapid rotation and the 'm-4' means a metal-poor star with metal lines that match a class of A7.[5] This is a confirmed variable star of the Gamma Doradus type with a period of 0.42658 days.[3] It is around 1.1[8] billion years old and is spinning with a projected rotational velocity of 136 km/s.[9]
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