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HD 219134

HR 8832
PIA19832-StarHD219134-Location-20150730.jpg
Star HR 8832 (circled) lies just off the "W" shape of the constellation Cassiopeia.
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 23h 13m 16.97632s
Declination +57° 10′ 06.0823″
Apparent magnitude (V) 5.574
Characteristics
Spectral type K3V
U−B color index +0.902
B−V color index +0.983
Variable type Suspected
Astrometry
Radial velocity (Rv) –18.5 km/s
Proper motion (μ) RA: +2075.07±0.33 mas/yr
Dec.: +295.45±0.25 mas/yr
Parallax (π) 152.76 ± 0.29mas
Distance 21.35 ± 0.04 ly
(6.55 ± 0.01 pc)
Absolute magnitude (MV) 6.46
Details
Mass 0.794+0.037
−0.022
 M
Radius 0.80±0.04 R
Luminosity 0.28 L
Surface gravity (log g) 4.50 cgs
Temperature 4710 K
Metallicity [Fe/H] +0.20 dex
Rotational velocity (v sin i) 6.94 km/s
Age ~12.46 Gyr
Other designations
BD+56 2966, FK5 875, GCTP 5616.00, Gl 892, HD 219134, HIP 114622, LFT 1767, LHS 71, LTT 16826, SAO 35236.
Database references
SIMBAD data

HR 8832 (or HD 219134, or Gliese 892) is a main sequence star in the constellation of Cassiopeia. It is smaller and less luminous than our Sun, with a spectral class of K3V, which makes it an orange-red hued star. HR 8832 is relatively close to our system, with an estimated distance of 21.25 light years. This star is close to the limit of apparent magnitude that can still be seen by the unaided eye. The limit is considered to be magnitude 6 for most observers.

This star has a magnitude 9.4 companion at an angular separation of 106.6 arcseconds. The star is reported to host a rocky super-Earth, HD 219134 b, based on size (1.6 times the size of Earth), and density (6 grams per cubic cm). A further three exoplanets, two super-Earths and one Jovian world, have been deduced using Harps-N radial velocity data. Two more were discovered two months later.

Coordinates: Sky map23h 13m 16.98s, +57° 10′ 06.1″


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