HR 8881 (HIP 115218)

HR 8881 is an orange dwarf star in the constellation Cassiopeia. At 1,034 light years away, it shines at an apparent visual magnitude of 6.39. It is moving through the Galaxy at a speed of 39.5 km/s relative to the Sun. Its projected Galactic orbit carries it between 16,900 and 24,800 light years from the center of the Galaxy. It will come closest to the Sun 7.3 million years from now when it will brighten to magnitude 4.15 from a distance of 368 light years. HR 8881 has one confirmed planet known to date (Dec. 2012).

Sky position: RA 23h 20.2m, Dec +61° 58.2'

Common designations: HIP 115218, HD 220074, HR 8881

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Galactic Orbit of HR 8881
(compared to the Sun)

Eccentricity: 19.0% vs. 16.0%

Angle φ : 162.6° vs. 26.0°

Semi-major axis : 6,392 pc vs. 8,686 pc

Semi-minor axis: 6,275 pc vs. 8,574 pc

Focus-to-center: 1,217 pc vs. 1,388 pc

Semilatus rectum : 6,160 pc vs. 8,464 pc

Perigalacticon: 5,175 pc vs. 7,297 pc

Apogalacticon: 7,608 pc vs. 10,074 pc
 
Some Tabulated XHIP Data for HR 8881
(see also: SIMBAD)

Astrometry
 2007A&A...474..653V
  Position Proper Motion
Right Ascension: 350.05987535° ±0.34 mas 7.61 ±0.42 mas/yr.
Declination: 61.97014036° ±0.36 mas -5.42 ±0.40 mas/yr.
     
Galactic Longitude: 112.43812785° 5.27 mas/yr.
Galactic Latitude: 0.97080467° -7.71 mas/yr.

Parallax: 3.08 ± 0.43 mas

Spectrography

Spectral Type: K1 V 1967POHP....9...27G.

Radial Velocity: -36.89 ±0.21 km/s [A rating] 2005A&A...430..165F.

Iron Abundance [Fe/H]: n/a
 


Photometry
 
band magnitude Abs. Mag.
U
B 8.07 0.56
V 6.39 -1.12
R
I 4.89 -2.62
J 3.18 -4.33
H 2.37 -5.13
K 2.01 -5.50

  B-V: +1.68       V-I: +1.50

Derivations

Heliocentric distance: 317.25 pc (14.0% margin of error)

Galactocentric distance: 7,527 pc

Transverse velocity: 14.1 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) -121.1 pc 293.2 pc 5.4 pc
Velocity (U, V, W) 6.7 km/s -36.9 km/s -12.2 km/s

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