Diphda, a yellow bright giant star in Cetus
Diphda is a yellow bright giant star in the constellation Cetus. At 96 light years away, it is the 52nd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 2.04.
Diphda (HIP 3419)
Diphda is a yellow bright giant star in the constellation Cetus. At 96 light years away, it is the 52nd brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 2.04. The iron abundance of Diphda is +0.02 (104.7% of the Sun). It is moving through the Galaxy at a speed of 35.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,800 and 27,200 light years from the center of the Galaxy.
Sky position: RA 0h 43.6m, Dec -17° 59.4'
Common designations: Diphda, Beta Ceti, 16 Ceti, HIP 3419, HD 4128, Gliese 31
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Brightest stars in Cetus:
(list all)
1
| 2.04
) Diphda
| Rank | Mag. | Star |
| 2 | 2.54 | Alpha Ceti |
| 3 | 3.46 | Dheneb |
| 4 | 3.47 | Kaffaljidhma |
| 5 | 3.49 | Tau Ceti |
| 6 | 3.56 | Deneb Kaitos Shemali |
| 7 | 3.60 | Theta Ceti |
| 8 | 3.74 | Baten Kaitos |
| 9 | 3.99 | Upsilon Ceti |
| 10 | 4.08 | Delta Ceti |
| 11 | 4.24 | Pi Ceti |
| 12 | 4.27 | Mu Ceti |
| 13 | 4.30 | Xi-2 Ceti |
| 14 | 4.36 | Xi-1 Ceti |
| 15 | 4.44 | 7 Ceti |
| 16 | 4.55 | 2 Ceti |
| 17 | 4.66 | Chi Ceti |
Hover over other bright stars to identify or click to jump.
Galactic Orbit of Diphda
(compared to the Sun)
E
ccentricity: 8.7% vs. 16.0%Angle φ : -70.5°vs. 26.0°
Semi-major axis : 7,676 pc vs. 8,686 pc
Semi-minor axis: 7,646 pc vs. 8,574 pc
Focus-to-center
: 670 pcvs. 1,388 pcSemilatus rectum : 7,617 pc vs. 8,464 pc
Perigalacticon: 7,006 pc vs. 7,297 pc
Apogalacticon
: 8,346 pcvs. 10,074 pcSome Tabulated XHIP Data for Diphda
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 10.89678447° ±0.13 mas | 232.55 ±0.18 mas/yr. |
| Declination: | -17.98668407° ±0.12 mas | 31.99 ±0.12 mas/yr. |
| Galactic Longitude: | 111.32671768° | 234.41 mas/yr. |
| Galactic Latitude: | -80.68104653° | -12.36 mas/yr. |
Parallax: 33.86 ± 0.16 mas
Spectrography
Spectral Type: G9II-III 2006AJ....132..161G.
Radial Velocity: 13.10 ±0.10 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
0.02 dex
2011A&A...525A..71W, 2007A&A...475.1003H, 1995AJ....110.2968L, 1990ApJS...74.1075M, 1986A&A...169..201G, 1981ApJ...248..228L.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 3.06 | 0.71 |
| V | 2.04 | -0.31 |
| R | ||
| I | 1.16 | -1.19 |
| J | 0.37 | -1.98 |
| H | -0.22 | -2.57 |
| K | -0.27 | -2.63 |
B-V: +1.02 V-I: +0.88
Derivations
Heliocentric distance: 29.53 pc (0.5% margin of error)
Galactocentric distance: 7,402 pc
Transverse velocity: 32.9 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | -1.7 pc | 4.5 pc | -29.1 pc |
| Velocity (U, V, W) | -30.7 km/s | -11.5 km/s | -13.2 km/s |