BD+29 5007
Star in the constellation Pegasus
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BD+29 5007 is a K-type star, located 77 light-years away in the constellation Pegasus.[3] It has a large-separation companion that was identified in 2016.[10] The pair was identified as a possible member of the 45-million year old Argus association,[11] though this is disputed.[12]
BD+29 5007 and its companion | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Pegasus[1] |
| Right ascension | 23h 50m 27.862s[2] |
| Declination | +30° 21′ 11.73″[2] |
| Apparent magnitude (V) | 9.35[1] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | K5V[3] |
| B−V color index | 1.226±0.024[1] |
| Astrometry | |
| Radial velocity (Rv) | −3.77±0.19[1] km/s |
| Proper motion (μ) | RA: 255.381 mas/yr Dec.: 10.628 mas/yr |
| Parallax (π) | 42.2919±0.0166 mas[2] |
| Distance | 77.12 ± 0.03 ly (23.645 ± 0.009 pc) |
| Absolute magnitude (MV) | 7.46[1] |
| Details | |
| Mass | 0.671±0.021[4] M☉ |
| Radius | 0.703±0.021[4] R☉ |
| Luminosity | 0.160±0.004[4] L☉ |
| Surface gravity (log g) | 4.51[5] cgs |
| Temperature | 4,327±144[4] K |
| Metallicity [Fe/H] | −0.05[5] dex |
| Rotation | 13.99 days[6] |
| Rotational velocity (v sin i) | 4.5[7] km/s |
| Age | 5[8] Gyr |
| Other designations | |
| BD+29°5007, GJ 9841, HIP 117559, SAO 73544, PPM 89170[9] | |
| Database references | |
| SIMBAD | data |
Properties
Companion
The companion is 2MASS J23512200+3010540 (short: 2MASS J2351+3010) that was discovered in 2010[13] and first identified as a possibly young low-mass object in 2014 by the BANYAN II survey. The authors find a L5.5 dwarf with red near-infrared colors. If it is a member of Argus, it should have a mass of 9−11 MJ, according to the authors.[14] However, the BANYAN VII survey in 2015 revised the status of 2MASS J2351+3010 to a field object, i.e. not a member of any stellar cluster or association.[12] This is also suggested by measured surface gravity of 2MASS J2351+3010, consistent with that of a field object.[15][16] This would mean that the companion is too massive to have a planetary mass (i.e. its mass is larger than 13 MJ).[16]
In 2016 it was identified as a possible companion to BD+29 5007.[10] In 2024 it was again identified as an Argus member with a mass of 11.9+0.4
−0.2 MJ. The same authors calculate that this system has a probability of 1.71% to be a false-positive match.[11][3] The companion is separated by 935 arcseconds, which translates into 22,100 astronomical units at this distance.[3] This high separation is larger than the 12,000 AU projected separation of Gliese 900 b,[17] currently the planetary-mass object with the longest known orbit, and is similar to brown dwarfs such as UCAC4 328-061594.[18]