HD 21242
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 03h 26m 35.36s |
| Declination | +28° 42′ 55.2″ |
| Apparent magnitude (V) | 6.47 |
| Characteristics | |
| Spectral type | G5IV |
| B−V color index | 0.882 ± 0.007 |
| Variable type | RS Canum Venaticorum variable |
| Astrometry | |
| Radial velocity (Rv) | 15.9 km/s |
| Proper motion (μ) | RA: 41.35 mas/yr Dec.: -104.29 mas/yr |
| Parallax (π) | 19.91 ± 1.25 mas |
| Distance | 160 ± 10 ly (50 ± 3 pc) |
| Absolute magnitude (MV) | 6.628 |
| Details | |
| Mass | 1.1 M☉ |
| Radius | 1.1 R☉ |
| Luminosity | 1.2 L☉ |
| Temperature | 5,000–6,000 K |
| Rotation | 6.39 days |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
HD 21242 or UX Arietis is a trinary star[citation needed] and variable star of RS CVn type.
References
External links
- Brinkman, Albert (2000). "High-Resolution Spectrum of UX Ari". Chandra Proposal ID #02200030. Bibcode:2000cxo..prop..392B.
- Drake, Stephen (1999). "Acis/hetg Spectroscopy of the Active Binaries Algol & UX Ari". Chandra Proposal ID #01200248. Bibcode:1999cxo..prop...20D.
- V. Aarum Ulvås and G. W. Henry (2003). "BV photometry of UX Ari in the period 1987-2002". Astronomy and Astrophysics.
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