HD 1461

Coordinates: Sky map 00h 18m 41.62s, −8° 03′ 9.5″
Source: Wikipedia, the free encyclopedia.
HD 1461
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus[1]
Right ascension 00h 18m 41.8674s[2]
Declination −08° 03′ 10.8058″[2]
Apparent magnitude (V) 6.47[3]
Characteristics
Spectral type G3VFe0.5[4]
Apparent magnitude (B) 7.14
Apparent magnitude (J) 5.329
Apparent magnitude (H) 5.041
Apparent magnitude (K) 4.897
U−B color index 0.29
B−V color index 0.68
V−R color index 0.35
R−I color index 0.32
Variable type None
Distance
76.5 ± 0.1 ly
(23.47 ± 0.03 pc)
Absolute magnitude (MV)4.63±0.03[5]
Details
Gyr
GCRV 50265, 2MASS J00184182-0803105[10]
Database references
Exoplanet Archive
data
ARICNSdata

HD 1461 is a

apparent visual magnitude of 6.47.[3] The star is located at a distance of 76.5 light-years (23.5 parsecs) from the Sun based on parallax,[2] but is drifting closer with a radial velocity of −10 km/s.[3]

This object is a

luminosity of the Sun from its photosphere at an effective temperature of 5,386 K.[7]

Planetary system

On 14 December 2009, scientists announced the discovery at least one

planet orbiting around HD 1461.[11][12] The planet, a super-Earth with a 5.8-day orbit was designated HD 1461 b
. The data also contained evidence for additional planets with orbital periods of around 400 and 5000 days but the star showed small variations with similar periods, casting doubt on the interpretation of these signals as being caused by orbiting planets.

In 2011, a paper was published on the arXiv pre-print server giving an orbital solution incorporating data from the HARPS spectrograph. This solution recovered the previously-known planet HD 1461 b, and an additional planet in a 13.5-day orbit.[13] The 13.5-day planet HD 1461 c was confirmed in 2015.[14]

Other than HD 1461 b, the designations for the planets are inconsistent: in the original paper, Rivera et al. designated the 400 and 5000-day candidates as "c" and "d" respectively, whereas the Mayor et al. (2011) pre-print uses the "c" designation for the 13.5-day planet and does not mention the 400-day or 5000-day planets at all.

HD 1461 b has a mass 6.44 times that of the Earth while HD 1461 c has a mass times 5.59 that of the Earth.[14]

The HD 1461 planetary system[14]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥6.44±0.61 M🜨 0.0634±0.0022 5.77152±0.00045 <0.131 — —
c ≥5.59±0.73 M🜨 0.1117±0.0039 13.5052±0.0029 <0.228 — —

See also

References

  1. doi:10.1086/132034. Vizier query form
  2. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  3. ^
    S2CID 119257644
  4. ^
    doi:10.1086/191373
    .
  5. ^ Holmberg; et al. (2009). "HD 1461". Geneva-Copenhagen Survey of Solar neighbourhood III. Retrieved 2010-12-04.
  6. ^ a b c d M. Tsantaki1; S. G. Sousa1; V. Zh. Adibekyan1; N. C. Santos1; A. Mortier1; G. Israelian (April 2013). "Deriving precise parameters for cool solar-type stars Optimizing the iron line list?" (PDF): 4. {{cite journal}}: Cite journal requires |journal= (help)CS1 maint: numeric names: authors list (link)
  7. ^
    doi:10.1093/mnras/stt2360
    .
  8. ^
    S2CID 119511744
    , 21.
  9. ^ a b Gould, B. (1879). "32G Ceti". Uranometria Argentina. Retrieved 2012-05-24.
  10. ^ "HD 1461". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-02.
  11. S2CID 12840404
    .
  12. ^ Tim Stephens (2009-12-14). "New planet discoveries suggest low-mass planets are common around nearby stars". UCSC News. UC Santa Cruz. Archived from the original on 2009-12-23. Retrieved 2009-12-14.
  13. arXiv:1109.2497 [astro-ph.EP
    ].
  14. ^
    S2CID 118531921
    .

External links


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