Gamma-2 Delphini (HIP 102532)

Gamma-2 Delphini is an orange subgiant star in the constellation Delphinus. At 101 light years away, it shines at an apparent visual magnitude of 4.27. Gamma-2 Delphini is the primary component of a multiple-star system. The iron abundance of Gamma-2 Delphini is +0.22 (166.0% of the Sun). It is moving through the Galaxy at a speed of 30.2 km/s relative to the Sun. Its projected Galactic orbit carries it between 19,500 and 26,800 light years from the center of the Galaxy.

Sky position: RA 20h 46.7m, Dec +16 7.2'

Common designations: Gamma-2 Delphini, 12 Delphini, HIP 102532, HD 197964, HR 7948

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Outstanding Lunar Images


Brightest stars in Delphinus:
(list all)

1

|    3.64

)   Rotanev

2

|    3.77

)   Svalocin

3

|    4.03

)   Deneb Dulfim

4

|    4.27

)   Gamma-2 Delphini

5

|    4.43

)   Delta Delphini

6

|    4.64

)   Zeta Delphini

7

|    4.94

)   Rho Aquilae

8

|    5.07

)   Kappa Delphini

9

|    5.15

)   Gamma-1 Delphini

10

|    5.19

)   17 Delphini

11

|    5.39

)   Eta Delphini

12

|    5.42

)   Iota Delphini

13

|    5.51

)   HR 8030

14

|    5.54

)   16 Delphini

15

|    5.57

)   13 Delphini

16

|    5.69

)   Theta Delphini

17

|    5.69

)   HR 8044

Location of Gamma-2 Delphini circled
Map detail from Stars of the Northern Hemisphere
Hover over other bright stars to identify or click to jump.


Galactic Orbit of Gamma-2 Delphini

(compared to the Sun)

Eccentricity: 15.8% vs. 16.0%

Angle φ : 113.8 vs. 26.0

Semi-major axis : 7,091 pc vs. 8,686 pc

Semi-minor axis: 7,002 pc vs. 8,574 pc

Focus-to-center: 1,122 pc vs. 1,388 pc

Semilatus rectum : 6,914 pc vs. 8,464 pc

Perigalacticon: 5,969 pc vs. 7,297 pc

Apogalacticon: 8,213 pc vs. 10,074 pc
 


Some Tabulated XHIP Data for Gamma-2 Delphini
(see also: SIMBAD)

Astrometry
2007A&A...474..653V
  Position Proper Motion
Right Ascension: 311.66465833 1.20 mas -30.50 0.70 mas/yr.
Declination: 16.12477326 0.87 mas -198.40 0.80 mas/yr.
     
Galactic Longitude: 61.49423406 -179.17 mas/yr.
Galactic Latitude: -16.57766457 -90.51 mas/yr.

Parallax: 32.14 1.19 mas


Spectrography

Spectral Type: K1IV 1993BICDS..43....5T : S.

Radial Velocity: -6.41 0.09 km/s [A rating] 2005A&A...430..165F.

Iron Abundance [Fe/H]: 0.22 0.02 dex  2011A&A...525A..71W, 2008A&A...480...91S, 2006AJ....131.3069L, 2004A&A...425..187T, 2003AJ....126.2015H, 1990ApJS...74.1075M.
 



Photometry
 
band magnitude Abs. Mag.
U
B 5.31 2.85
V 4.27 1.81
R 4.10 1.64
I 3.35 0.89
J
H
K

  B-V: +1.04       V-I: +0.92


Derivations

Heliocentric distance: 31.06 pc (3.7% margin of error)

Galactocentric distance: 7,386 pc

Transverse velocity: 29.6 km/s

3D heliocentric position and motion:

toward:   

Galactic center Galactic rotation North Galactic Pole
Position ( X, Y, Z) 14.2 pc 26.2 pc -8.9 pc
Velocity (U, V, W) 18.4 km/s -21.3 km/s -10.9 km/s

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