HD 2039

Nomenclature

The designation HD 2039 from the Henry Draper Catalogue. The catalogue, which was published between 1918 and 1924, was based on the work of Annie Jump Cannon and her team between 1911 and 1915. HD 2039 does not have a common, colloquial name that is characteristic of stars like Sirius, Procyon, and Aldebaran.

Characteristics

HD 2039 is a stable G-type star, meaning it shines with white colour similar to the Sun. HD 2039 has a radius approximately 40 percent larger than the Sun's. The star is slightly hotter than the Sun; while HD 2039 has a temperature of , the Sun's surface temperature lies nearly 200 kelvins lower at . HD 2039 is unusually metal-rich, which has attracted the attention of astrophysicists.

Distance and visibility

The star's magnitude is 9.0; this signifies that the body is not visible with the naked eye, but can be seen with a telescope. HD 2039 lies 277 light years from the Sun, which is about as far from the Sun as the second brightest star in the night sky, Canopus.

Planetary system

In 2002, a planet was found by the Anglo-Australian Planet Search team to be orbiting the star in a very eccentric orbit. It has a minimum mass more than four times that of Jupiter and has an orbital period of over three years. The planet orbits its star at a distance of approximately two AU away; the planet Earth, in comparison, orbits at a distance of one AU away from the Sun. HD 2039 b's discovery was reported quietly; no press release was provided by the observatory that discovered the star's planet, and no formal announcement of the planet's existence was made. The entity was the 100th exoplanet to have been verified by the scientific community.

References

References

1. Holmberg. (2009). "HD 2039". Geneva-Copenhagen Survey of Solar neighbourhood III.
2. pp. 214–215 in The Henry Draper Memorial, Annie J. Cannon, ''Journal of the Royal Astronomical Society of Canada'' '''9''', #5 (May–June 1915), pp. 203–215, {{bibcode. 1915JRASC...9..203C.
3. The Henry Draper Catalogue, Annie J. Cannon and Edward C. Pickering, ''Annals of Harvard College Observatory'';
   hours 0 to 3, '''91''' (1918), {{bibcode. 1918AnHar..91....1C;
   hours 4 to 6, '''92''' (1918), {{bibcode. 1918AnHar..92....1C;
   hours 7 to 8, '''93''' (1919), {{bibcode. 1919AnHar..93....1C;
   hours 9 to 11, '''94''' (1919), {{bibcode. 1919AnHar..94....1C;
   hours 12 to 14, '''95''' (1920), {{bibcode. 1920AnHar..95....1C;
   hours 15 to 16, '''96''' (1921), {{bibcode. 1921AnHar..96....1C;
   hours 17 to 18, '''97''' (1922), {{bibcode. 1922AnHar..97....1C;
   hours 19 to 20, '''98''' (1923), {{bibcode. 1923AnHar..98....1C;
   hours 21 to 23, '''99''' (1924), {{bibcode. 1924AnHar..99....1C.
4. (2004). "Sun Factsheet". [[National Aeronautics and Space Administration]].
5. (2008). "Stellar Magnitudes". [[University of Tennessee]].
6. Rao, Joe. (February 17, 2005). "Great Star of the South". SPACE.com.
7. (2008). "Astronomical unit". National Aeronautics and Space Administration.
8. Britt, Robert. (July 2, 2002). "Planet Tally Soars to Near 100, Astronomers Scramble to Keep Track". SPACE.com.
9. (September 2010). "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity". The Astrophysical Journal.
10. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics.
11. {{Cite Gaia DR3. 4919009555730599936
12. "HD 2039".
13. {{cite constellation. HD 2039
14. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics.
15. (1975). "University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0".
16. (2003). "Four New Planets Orbiting Metal-enriched Stars". The Astrophysical Journal.
17. (2020). "Cool Jupiters greatly outnumber their toasty siblings: occurrence rates from the Anglo-Australian Planet Search". Monthly Notices of the Royal Astronomical Society.