| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Sculptor1 |
| HD 4113 A | |
| Right ascension | 00h 43m 12.59559s2 |
| Declination | −37° 58′ 57.4777″2 |
| Apparent magnitude (V) | 7.880±0.0133 |
| HD 4113 B | |
| Right ascension | 00h 43m 11.89423s4 |
| Declination | −37° 58′ 09.1687″4 |
| Apparent magnitude (V) | 12.70±0.023 |
| Characteristics | |
| Spectral type | G5V and M0–1V3 |
| B−V color index | 0.716±0.0033 |
| Astrometry | |
| HD 4113 A | |
| Radial velocity (Rv) | 5.05±0.122 km/s |
| Proper motion (μ) | RA: 49.412±0.016 mas/yr2 Dec.: −114.290±0.024 mas/yr2 |
| Parallax (π) | 23.8256±0.0240 mas2 |
| Distance | 136.9 ± 0.1 ly (41.97 ± 0.04 pc) |
| Absolute magnitude (MV) | 4.780±0.0463 |
| HD 4113 B | |
| Radial velocity (Rv) | 4.44±0.394 km/s |
| Proper motion (μ) | RA: 53.733±0.022 mas/yr4 Dec.: −113.983±0.032 mas/yr4 |
| Parallax (π) | 23.9023±0.0327 mas4 |
| Distance | 136.5 ± 0.2 ly (41.84 ± 0.06 pc) |
| Absolute magnitude (MV) | 9.600±0.0493 |
| Orbit5 | |
| Name | HD 4113 C |
| Period (P) | 348.325+21.932 −15.139 yr |
| Semi-major axis (a) | 50.438+2.060 −1.420 AU |
| Eccentricity (e) | 0.648+0.008 −0.007 |
| Inclination (i) | 83.456+2.342 −1.269° |
| Longitude of the node (Ω) | 225.686+0.704 −1.486° |
| Periastron epoch (T) | 2324305.035+127045.323 −7894.349 |
| Argument of periastron (ω) (secondary) | 249.665+3.552 −4.805° |
| Semi-amplitude (K1) (primary) | 0.263535+0.002058 −0.003037 km/s |
| Details6 | |
| A | |
| Mass | 1.02+0.02 −0.03 M☉ |
| Radius | 1.08+0.02 −0.047 R☉ |
| Luminosity | 1.085+0.04 −0.037 L☉ |
| Surface gravity (log g) | 4.31±0.04 cgs |
| Temperature | 5,638±50 K |
| Metallicity [Fe/H] | 0.20±0.04 dex |
| Rotational velocity (v sin i) | 2.3243 km/s |
| Age | 7.29+1.91 −1.46 or 5.0+1.3 −1.73 Gyr |
| B | |
| Mass | 0.553 M☉ |
| Surface gravity (log g) | 4.763 cgs |
| Temperature | 3,8333 K |
| C | |
| Mass | 51.913+0.604 −0.4585 MJup |
| Radius | 1.4–1.53 RJup |
| Surface gravity (log g) | 4.5–53 cgs |
| Temperature | 500–6003 K |
| Other designations | |
| CD−38°223, GC 858, HD 4113, HIP 3391, SAO 192693, GSC 03654-021318 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 4113 is a double star system in the southern constellation of Sculptor. It is too faint to be viewed with the naked eye, having an apparent visual magnitude of 7.88.3 The distance to this star, as estimated by parallax measurements, is 137 light years.2 It is receding away from the Sun with a radial velocity of +5 km/s.2
System components
The primary member of this system, component A, is a Sun-like G-type main-sequence star with a stellar classification of G5V.3 Estimates of its age are five3 to seven6 billion years old, and it is spinning with a leisurely projected rotational velocity of 2.3 km/s.3 The star is metal rich, with nearly the same mass,6 radius, and luminosity7 as the Sun.
Orbiting this star is a giant planet and a brown dwarf (HD 4113 C); the latter has been directly imaged. It also has a co-moving stellar companion, designated component B, which is a red dwarf with a class of M0–1V at an angular separation of 43″. This angle is equivalent to a projected separation of 2,000 AU.3
The most recent parameters for HD 4113 C as of 2022 come from a combination of data from radial velocity, astrometry, and imaging, showing that it is about 52 times the mass of Jupiter, and on an eccentric orbit with a semi-major axis of about 50.4 AU and an orbital period of about 348 years.5
Observations with SPHERE found a lack of a detection of HD 4113 C in H3, likely due to methane absorption in the H-band. Using the extracted spectrum the team estimated a spectral type of T9.3 Observation with GRAVITY+ showed strong methane absorption in the K-band spectrum of HD 4113 C. The inconsistency between temperature and isochronal mass estimate is seen as potential evidence for a binary brown dwarf.9
Planetary system
On 26 October 2007, Tamuz et al. used the radial velocity method to find a planet with a minimum mass one and half times that of Jupiter orbiting at 1.28 AU away from HD 4113 A. The planet's orbit is highly eccentric.10
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | ≥1.703+0.040 −0.059 MJ |
1.280±0.004 | 1.442+0.0002 −0.0001 |
0.899+0.004 −0.003 |
— | — |
References
References
- Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- Cheetham, A.; et al. (June 2018). "Direct imaging of an ultracool substellar companion to the exoplanet host star HD 4113 A". Astronomy & Astrophysics. 614: 19. arXiv:1712.05217. Bibcode:2018A&A...614A..16C. doi:10.1051/0004-6361/201630136. S2CID 119084543. A16.
- Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21): 21. arXiv:2208.12720. Bibcode:2022ApJS..262...21F. doi:10.3847/1538-4365/ac7e57. S2CID 251864022.
- Aguilera-Gómez, Claudia; et al. (June 2018). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy & Astrophysics. 614: 15. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. S2CID 62799777. A55.
- 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.
- "HD 4113". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-11-04.
- GRAVITY+ Collaboration (2025). "First Light for the GRAVITY+ Adaptive Optics: Extreme Adaptive Optics for the Very Large Telescope Interferometer". arXiv:2509.21431 [astro-ph.IM].
- Tamuz, O.; et al. (2008). "The CORALIE survey for southern extra-solar planets XV. Discovery of two eccentric planets orbiting HD 4113 and HD 156846". Astronomy and Astrophysics. 480 (3): L33–L36. arXiv:0710.5028. Bibcode:2008A&A...480L..33T. doi:10.1051/0004-6361:20078737. S2CID 11350536.
External links
External links
- "Notes for star HD 4113". Extrasolar Planets Encyclopaedia. Archived from the original on November 6, 2007. Retrieved 2008-08-24.