HAT-P-4
HAT-P-4 is a wide binary star consisting of a pair of G-type main-sequence stars[5] in the constellation of Boötes.[1] It is also designated BD+36°2593.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes[1] |
HAT-P-4A | |
Right ascension | 15h 19m 57.9205s[2] |
Declination | +36° 13′ 46.7380″[2] |
Apparent magnitude (V) | 11.159±0.010[3] |
HAT-P-4B | |
Right ascension | 15h 20m 00.0129s[4] |
Declination | +36° 12′ 18.5209″[4] |
Apparent magnitude (V) | 11.534±0.01[3] |
Characteristics | |
Spectral type | G0V/G2V[5] |
B−V color index | 0.771 |
Astrometry | |
HAT-P-4A | |
Proper motion (μ) | RA: −21.661±0.035[2] mas/yr Dec.: −24.250±0.058[2] mas/yr |
Parallax (π) | 3.0919 ± 0.0273[2] mas |
Distance | 1,055 ± 9 ly (323 ± 3 pc) |
HAT-P-4B | |
Proper motion (μ) | RA: −21.536±0.032[4] mas/yr Dec.: −24.229±0.056[4] mas/yr |
Parallax (π) | 3.0739 ± 0.0272[4]> mas |
Distance | 1,061 ± 9 ly (325 ± 3 pc) |
Details | |
HAT-P-4A | |
Mass | ~ 1.26 M☉ |
Radius | 1.59 ± 0.07 R☉ |
Luminosity | 0.41 L☉ |
Surface gravity (log g) | 4.33±0.13[6] cgs |
Temperature | 6036±46[6] K |
Metallicity [Fe/H] | 0.277±0.007[6] dex |
Rotational velocity (v sin i) | 5.6 ± 0.9[7] km/s |
Age | ~4.2 Gyr |
HAT-P-4B | |
Surface gravity (log g) | 4.38±0.14[6] cgs |
Temperature | 6037±37[6] K |
Metallicity [Fe/H] | 0.175±0.006[6] dex |
Position (relative to HAT-P-4A)[5] | |
Component | HAT-P-4B |
Epoch of observation | 1999/02/07 |
Angular distance | 91.760±0.099″ |
Position angle | 163.97±0.06° |
Observed separation (projected) | 28446 AU |
Other designations | |
Database references | |
SIMBAD | data |
Extrasolar Planets Encyclopaedia | data |
Data sources: | |
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
The star exhibits an infrared excess noise of unknown origin.[8]
Planetary System
The primary star is home to the transiting extrasolar planet HAT-P-4b.[9]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.651+0.033 −0.037 MJ |
0.04449+0.00083 −0.0012 |
3.0565254±0.0000012 | <0.0073 | — | — |
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See also
References
- Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Henden, A. A.; et al. (2016). "VizieR Online Data Catalog: AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)". VizieR On-line Data Catalog: II/336. Originally Published in: 2015AAS...22533616H. 2336. Bibcode:2016yCat.2336....0H. Vizier catalog entry for component A Vizier catalog entry for component B
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Mugrauer, M.; Ginski, C.; Seeliger, M. (2014). "New wide stellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 439 (1): 1063–1070. Bibcode:2014MNRAS.439.1063M. doi:10.1093/mnras/stu044.
- Saffe, C.; et al. (2017). "Signatures of rocky planet engulfment in HAT-P-4. Implications for chemical tagging studies". Astronomy and Astrophysics Letters. 604. L4. arXiv:1707.02180. Bibcode:2017A&A...604L...4S. doi:10.1051/0004-6361/201731430.
- Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161.
- EXTRASOLAR PLANET TRANSITS OBSERVED AT KITT PEAK NATIONAL OBSERVATORY, 2012, arXiv:1202.2799
- Kovács, G.; et al. (2007). "HAT-P-4b: A Metal-rich Low-Density Transiting Hot Jupiter". The Astrophysical Journal Letters. 670 (1): L41–L44. arXiv:0710.0602. Bibcode:2007ApJ...670L..41K. doi:10.1086/524058.
- Bonomo, A. S.; et al. (2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy and Astrophysics. 602. A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.
- Sada, Pedro V.; et al. (2012). "Extrasolar Planet Transits Observed at Kitt Peak National Observatory". Publications of the Astronomical Society of the Pacific. 124 (913): 212–229. arXiv:1202.2799. Bibcode:2012PASP..124..212S. doi:10.1086/665043.
External links
- Image HAT-P-4
- "HAT-P-4". Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-05-10.
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