15 Arietis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 02h 10m 37.59642s[1] |
| Declination | +19° 30′ 01.2099″[1] |
| Apparent magnitude (V) | 5.74[2] |
| Characteristics | |
| Spectral type | M3 III[3] |
| U−B color index | +1.91[4] |
| B−V color index | +1.64[4] |
| Variable type | Pulsating |
| Astrometry | |
| Radial velocity (Rv) | +62.04 ± 0.22[5] km/s |
| Proper motion (μ) | RA: +87.88[1] mas/yr Dec.: -27.82[1] mas/yr |
| Parallax (π) | 5.84 ± 0.49[1] mas |
| Distance | 560 ± 50 ly (170 ± 10 pc) |
| Details | |
| Radius | 67[6] R☉ |
| Other designations | |
15 Arietis (abbreviated 15 Ari) is a single[2] variable star in the northern constellation of Aries. 15 Arietis is the Flamsteed designation; it also bears the variable star designation AV Arietis. It has an apparent visual magnitude of 5.74,[2] which is just bright enough to be visible to the naked eye from dark suburban skies. An annual parallax shift of 5.84 mas[1] corresponds to a physical distance of approximately 560 light-years (170 parsecs) from Earth. At that distance, the star's brightness is reduced by 0.33[5] in magnitude because of extinction from interstellar gas and dust.
This is a red giant star with a stellar classification of M3 III.[3] The measured angular diameter of this star is 3.67 ± 0.11 mas.[7] At the estimated distance of Delta Ophiuchi,[1] this yields a physical size of about 67 times the radius of the Sun.[6] It is a pulsating variable; the first pulsation period is 18.1 days with an amplitude of 0.028 magnitudes, while the second is 21.9 days and 0.030 in magnitude.[3]
References
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