| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 22m 14.00070s[2] |
| Declination | +29° 22′ 11.7179″[2] |
| Apparent magnitude (V) | 6.6[3] |
| Characteristics | |
| Spectral type | M3III[4] |
| U−Bcolor index | +1.46[3] |
| B−Vcolor index | +1.60[3] |
| Variable type | Irregular[5] |
| Astrometry | |
| Radial velocity (Rv) | −19.66±0.54[6] 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[7] |
| Details | |
| Mass | 1.8[2] M☉ |
| Radius | 71[2] R☉ |
| Luminosity | 943[2] L☉ |
| Temperature | 3,227[8] K |
| Age | 1.6[2] Gyr |
| Other designations | |
| CI Boötes,BD+30°2513,HD126009,HIP 70236,SAO 83312. | |
| Database references | |
| SIMBAD | data |
HD 126009 orCI Boötis is avariable star[4] in the northernconstellation ofBoötes. With anapparent magnitude of 6.6, it would be extremely difficult to see with thenaked eye even under the very best observing conditions, but can easily be seen with binoculars.
The German astronomer Wolfgang Strohmeier announced that HD 126009 is a variable star in 1960.[9] It was given itsvariable star designation, CI Boötis, in 1978.[10]
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