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HD 123657 |
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Boötes |
| Right ascension | 01h 09m 43.9s |
| Declination | +35° 37′ 14″ |
| Apparent magnitude (V) | 2.07 |
| Characteristics | |
| Spectral type | M4.5:III |
| U-B color index | 1.66 |
| B-V color index | 1.59 |
| R-I color index | 1.66 |
| Variable type | Variable star (171) |
| Astrometry | |
| Radial velocity (Rv) | -35.8 km/s |
| Proper motion (μ) | RA: 11.73 mas/yr Dec.: -29.76 mas/yr |
| Parallax (π) | 7.01 ± 0.66 mas |
| Distance | 470 ± 40 ly (140 ± 10 pc) |
| Absolute magnitude (MV) | 6.71 |
| Details | |
| Mass | 0,4 M☉ |
| Radius | 0,5 R☉ |
| Luminosity | 0,04 L☉ |
| Temperature | 2,000–3,500 K |
| Other designations | |
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BY Boötis, JP11 2471, AG+44° 1162, GSC 03040-00969, 2MASS J14075576+4351160, TYC 3040-969-1, BD+44° 2325, HD 123657, N30 3210, UBV M 19995, CSV 7099, HIC 69038, PLX 3214, UBV 12478, DO 34564, HIP 69038, PMC 90-93 957, FK5 1368, HR 5299, PPM Star Catalogue 53940, GC 19084, IRAS 14059+4405, RAFGL 1680, AAVSO 1403+44, GCRV 8285, IRC +40253, SAO 44901.
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| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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HD 123657 or BY Boötis is a variable star. Variability spectral is 4.98 - 5.33V, " slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg). This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities, " § hypothetical.
References
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