Astronomy:42 Draconis b
| Discovery | |
|---|---|
| Discovered by | Doellinger et al. |
| Discovery site | TLS |
| Discovery date | March 20, 2009 |
| radial velocity | |
| Orbital characteristics | |
| astron|astron|helion}} | 1.64 AU (245,000,000 km) |
| astron|astron|helion}} | 0.74 AU (111,000,000 km) |
| 1.19 ± 0.01 AU (178,000,000 ± 1,500,000 km) | |
| Eccentricity | 0.38 ± 0.06 |
| Orbital period | 479.1 ± 6.2 d 1.312 ± 0.017 y |
| astron|astron|helion}} | 2452757.4 ± 3.7 |
| 218.7 ± 10.6 | |
| Star | 42 Draconis |
| Physical characteristics | |
| Mass | ≥3.88±0.85 Jupiter mass |
42 Draconis b (abbreviated 42 Dra b), formally named Orbitar /ˈɔːrbɪtɑːr/, is a candidate extrasolar planet located approximately 315 light years from Earth in the constellation of Draco. It orbits the 5th magnitude K-type giant star 42 Draconis with a period of 479 days and 38% orbital eccentricity.[1] The planet was discovered using the radial velocity method on March 20, 2009.[1]
Following its discovery the planet was designated 42 Draconis b. In July 2014 the International Astronomical Union launched NameExoWorlds, a process for giving proper names to certain exoplanets and their host stars.[2] The process involved public nomination and voting for the new names.[3] In December 2015, the IAU announced the winning name was Orbitar for this planet.[4] The winning name was submitted by the Brevard Astronomical Society of Brevard County, Florida, United States .[5] Orbitar is a contrived word paying homage to the space launch and orbital operations of NASA.[6]
A 2021 study found that more recent radial velocity measurements of 42 Draconis were inconsistent with the proposed planetary orbit, casting serious doubt on 42 Draconis b's existence, but with a two-planet solution still being a possibility. The study suggests that the radial velocity signal is likely caused by a yet unknown stellar phenomenon, which might be common in giant stars.[7]
See also
References
- ↑ 1.0 1.1 Döllinger, M. P. et al. (2009). "Planetary companion candidates around the K giant stars 42 Draconis and HD 139357". Astronomy and Astrophysics 499 (3): 935–942. doi:10.1051/0004-6361/200810837. Bibcode: 2009A&A...499..935D. http://www.aanda.org/articles/aa/full_html/2009/21/aa10837-08/aa10837-08.html.
- ↑ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014
- ↑ "NameExoWorlds". http://nameexoworlds.iau.org/process.
- ↑ Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015.
- ↑ Website
- ↑ "NameExoWorlds". http://nameexoworlds.iau.org/names.
- ↑ Döllinger, M. P.; Hartmann, M. (September 2021). "A Sanity Check for Planets around Evolved Stars". The Astrophysical Journal Supplement Series 256 (1): 10. doi:10.3847/1538-4365/ac081a. Bibcode: 2021ApJS..256...10D.
External links
- Jean Schneider (2011). "Notes for Planet 42 Dra b". Extrasolar Planets Encyclopaedia. https://exoplanet.eu/catalog/42_dra_b--545/.
Coordinates: 
18h 25m 59.1381s, +65° 33′ 48.530″
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