HR 4428 (HIP 56078)

HR 4428 is a white main-sequence star in the constellation Crater. At 442 light years away, it shines at an apparent visual magnitude of 5.77. HR 4428 is a multiple-star system. It is moving through the Galaxy at a speed of 36.8 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,000 and 28,300 light years from the center of the Galaxy.

Sky position: RA 11h 29.6m, Dec -24 27.6'

Common designations: HIP 56078, HD 99922, HR 4428

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Galactic Orbit of HR 4428

(compared to the Sun)

Eccentricity: 10.3% vs. 16.0%

Angle φ : -57.6 vs. 26.0

Semi-major axis : 7,873 pc vs. 8,686 pc

Semi-minor axis: 7,831 pc vs. 8,574 pc

Focus-to-center: 812 pc vs. 1,388 pc

Semilatus rectum : 7,789 pc vs. 8,464 pc

Perigalacticon: 7,061 pc vs. 7,297 pc

Apogalacticon: 8,685 pc vs. 10,074 pc
 


Some Tabulated XHIP Data for HR 4428
(see also: SIMBAD)

Astrometry
2007A&A...474..653V
  Position Proper Motion
Right Ascension: 172.41103191 0.47 mas -56.40 1.50 mas/yr.
Declination: -24.46405886 0.42 mas 9.70 1.30 mas/yr.
     
Galactic Longitude: 280.15805851 -55.88 mas/yr.
Galactic Latitude: 34.76465818 -12.37 mas/yr.

Parallax: 7.32 0.61 mas


Spectrography

Spectral Type: A0 V 1988MSS...C04....0H.

Radial Velocity: -2.50 1.20 km/s [B rating] 2007AN....328..889K.

Iron Abundance [Fe/H]: n/a
 



Photometry
 
band magnitude Abs. Mag.
U
B 5.84 0.18
V 5.77 0.11
R
I 5.66 0.00
J
H
K

  B-V: +0.07       V-I: +0.11


Derivations

Heliocentric distance: 135.48 pc (8.3% margin of error)

Galactocentric distance: 7,382 pc

Transverse velocity: 36.8 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) 19.6 pc -109.6 pc 77.3 pc
Velocity (U, V, W) -34.9 km/s -8.8 km/s -8.0 km/s

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