HD 15337
  | |
| Observation data Epoch J2000.0[1] Equinox J2000.0[1] | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 27m 28.37813s |
| Declination | −27° 38′ 06.7368″ |
| Apparent magnitude (V) | 9.09[2] |
| Characteristics | |
| Spectral type | K1V[3] |
| B−V color index | 0.86[4] |
| J−H color index | 0.338[4] |
| J−K color index | 0.509[4] |
| Astrometry | |
| Radial velocity (Rv) | −3.882[5] km/s |
| Proper motion (μ) | RA: -73.581[1] mas/yr Dec.: −211.935[1] mas/yr |
| Parallax (π) | 22.2922 ± 0.016[1] mas |
| Distance | 146.3 ± 0.1 ly (44.86 ± 0.03 pc) |
| Absolute magnitude (MV) | 5.56+0.05 −0.06[lower-alpha 1] |
| Details[6] | |
| Mass | 0.829±0.038 M☉ |
| Radius | 0.855±0.008 R☉ |
| Luminosity | 0.472+0.023 −0.024[7] L☉ |
| Surface gravity (log g) | 4.37±0.08 cgs |
| Temperature | 5131±74 K |
| Metallicity [Fe/H] | 0.03±0.04 dex |
| Rotation | 36.55 d |
| Age | 9.6+3.8 −3.9 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 15337 (TOI-402) is a star with an orbiting exoplanet in the southern constellation of Fornax. It has an apparent magnitude of 9.09, making it too faint to be observed by the naked eye from Earth, but readily visible using a small telescope.[8] It is located 146 light-years (45 parsecs) distant based on stellar parallax, and is currently heading towards the Solar System with a radial velocity of −3.9 km/s.
The star is about 15% smaller than the Sun in both mass and radius and radiates slightly less than half the Sun's luminosity from its photosphere. It has a spectral type of K1V and an effective temperature of 5,131 K (4,858 °C; 8,776 °F), giving the star an orange hue. It is 9.6+3.8
−3.9 billion years old, making it much older than the Solar System. The star has a solar-like metallicity and displays similar amounts of stellar activity to the Sun.[7]
Planetary system
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 6.519 M⊕ | 0.05245[7] | 4.7559804 | 0.058 | 89.30° | 1.770 R⊕ |
| c | 6.792 M⊕ | 0.1235[7] | 17.180546 | 0.096 | 88.41° | 2.526 R⊕ |
See also
- Kepler-93b: another hot super-Earth with precise measurements.
Notes
- ↑ Calculated from star's luminosity.
References
- ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. Unknown parameter
|s2cid=ignored (help) Gaia EDR3 record for this source at VizieR. - ↑ Høg, E.; et al. (February 2000). "The Tycho-2 Catalogue of the 2.5 Million Brightest Stars". Astronomy and Astrophysics. 355 (1): L27–L30. Bibcode:2000A&A...355L..27H.
- ↑ Gandolfi, Davide; et al. (2019-05-06). "The Transiting Multi-planet System HD15337: Two Nearly Equal-mass Planets Straddling the Radius Gap". The Astrophysical Journal Letters. American Astronomical Society. 876 (2): L24. doi:10.3847/2041-8213/ab17d9. ISSN 2041-8205.
- ↑ 4.0 4.1 4.2 4.3 "HD 15337". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-10-09.
- ↑ 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.
- ↑ 6.0 6.1 Rosário, N. M.; et al. (2024). "Precise characterisation of HD 15337 with CHEOPS: A laboratory for planet formation and evolution". Astronomy & Astrophysics. EDP Sciences. 686: A282. doi:10.1051/0004-6361/202347759. ISSN 0004-6361.
- ↑ 7.0 7.1 7.2 7.3 Dumusque, Xavier; et al. (2019-06-28). "Hot, rocky and warm, puffy super-Earths orbiting TOI-402 (HD 15337)". Astronomy & Astrophysics. EDP Sciences. 627: A43. doi:10.1051/0004-6361/201935457. ISSN 0004-6361.
- ↑ Sherrod, P. Clay; Koed, Thomas L. (2003). A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations. Astronomy Series. Courier Dover Publications. p. 9. ISBN 0-486-42820-6. Search this book on
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