HD 123657
Star in the constellation Boötes / From Wikipedia, the free encyclopedia
HD 123657, or BY Boötis, is a variable star of magnitude 4.98–5.33V. This makes it a dim naked eye star. The star is located near the end of the handle of the Big Dipper, but just within the boundaries of the constellation Boötes.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 14h 07m 55.756s[1] |
Declination | 43° 51′ 16.03″[1] |
Apparent magnitude (V) | 5.28[2] (4.98-5.33[3]) |
Characteristics | |
Spectral type | M4.5III[4] |
U−B color index | 1.66[2] |
B−V color index | 1.58[2] |
R−I color index | 1.66[2] |
Variable type | LB[4] |
Astrometry | |
Radial velocity (Rv) | -36.24[5] km/s |
Proper motion (μ) | RA: 11.63[1] mas/yr Dec.: -30.08[1] mas/yr |
Parallax (π) | 6.36 ± 0.26 mas[1] |
Distance | 510 ± 20 ly (157 ± 6 pc) |
Absolute magnitude (MV) | −0.90[6] |
Details | |
Radius | 70[7] R☉ |
Luminosity | 1,380[8] L☉ |
Temperature | 3,500[8] K |
Metallicity [Fe/H] | −0.03[9] dex |
Other designations | |
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. | |
Database references | |
SIMBAD | data |
Close
It is a slow irregular red giant variable star with a range of less than half a magnitude. It is over a thousand times as luminous as the sun, only 3,500 K but with a large expanded atmosphere.