HD 126009
Star in the constellation Boötes
From Wikipedia, the free encyclopedia
HD 126009 or CI Boötis is a variable star[4] in the northern constellation of Boötes. With an apparent magnitude of about 6.5, it would be difficult to see with the naked eye even under the very best observing conditions, but can easily be seen with binoculars.
Right ascension14h 22m 14.00070s[2]
Declination+29° 22′ 11.7179″[2]
Apparentmagnitude(V)6.47 – 6.81[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 22m 14.00070s[2] |
| Declination | +29° 22′ 11.7179″[2] |
| Apparent magnitude (V) | 6.47 – 6.81[3] |
| Characteristics | |
| Spectral type | M3III[4] |
| U−B color index | +1.46[5] |
| B−V color index | +1.60[5] |
| Variable type | Irregular[6] |
| Astrometry | |
| Radial velocity (Rv) | −19.66±0.54[7] km/s |
| Proper motion (μ) | RA: −39.980[2] mas/yr Dec.: −26.201[2] mas/yr |
| Parallax (π) | 4.5229±0.0973 mas[2] |
| Distance | 720 ± 20 ly (221 ± 5 pc) |
| Absolute magnitude (MV) | −0.268[8] |
| Details | |
| Mass | 1.8[2] M☉ |
| Radius | 71[2] R☉ |
| Luminosity | 943[2] L☉ |
| Temperature | 3,227[9] K |
| Age | 1.6[2] Gyr |
| Other designations | |
| CI Boötes, BD+30°2513, HD126009, HIP 70236, SAO 83312. | |
| Database references | |
| SIMBAD | data |
The German astronomer Wolfgang Strohmeier announced that HD 126009 is a variable star in 1960.[10] It was given its variable star designation, CI Boötis, in 1978.[11]
