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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 05 30 51.45227 |
| Declination | −36° 37′ 50.8957″ |
| Apparent magnitude (V) | 15.57±0.03 |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | M0.5 |
| B−V color index | +1.37 |
| R−I color index | +1.39 |
| Astrometry | |
| Radial velocity (Rv) | 97.18±0.01 km/s |
| Proper motion (μ) | RA: −31.887 mas/yr Dec.: −41.077 mas/yr |
| Parallax (π) | 4.5935 ± 0.017 mas |
| Distance | 710 ± 3 ly (217.7 ± 0.8 pc) |
| Details | |
| Mass | 0.617 −0.062 M☉ |
| Radius | 0.573±0.077 R☉ |
| Luminosity | (7.03±0.09)×10 L☉ |
| Surface gravity (log g) | 4.71±0.23 cgs |
| Temperature | 3,916 −63 K |
| Rotational velocity (v sin i) | <1.0 km/s |
| Other designations | |
| UCAC2 16099071, NGTS-1, UCAC4 267-006604, DENIS J053051.4-363750, TIC 192826603 USNO-B1.0 0533-00066386, 2MASS J05305145-3637508,UCAC3 107-15281, Gaia DR2 4821739369794767744 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
NGTS-1, also designated as TOI-551 is a solitary star located in the southern constellation Columba, the dove. With an apparent magnitude of 15.52, NGTS-1 can only be seen through a powerful telescope. Gaia DR3 parallax measurements imply a distance of 710 light-years and it is drifting away rapidly with a heliocentric radial velocity of 97.2 km/s.
Properties
NGTS-1 has a stellar classification of M0.5, indicating that is an early M-type star. It has 61% of the mass of the Sun and over half of its radius. Since red dwarfs are fully convective, they do not burn as much as more massive stars. As a result, NGTS-1 only radiates 7.02% of the luminosity of the Sun from its photosphere at an effective temperature of 3,916 K. There was difficulty determining the metallicity of the object due to its faintness, but NGTS-1 is assumed to be around solar metallicity. In addition, this also provided some uncertainty about the star's properties since red dwarfs properties are dependent on their metallicity. It spins too slowly for it to be measured accurately, having a projected rotational velocity lower than 1.0 km/s.
Planetary system
The discovery of a hot Jupiter orbiting the star was reported in 2017 as part of the Next Generation Transit Survey. The media also dubbed NGTS-1b as "monstrous" since the planet is relatively large compared to its host star.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.812+0.066 −0.075 MJ |
0.0326+0.0047 −0.0045 |
2.6473068±0.0000017 | 0.016+0.023 −0.012 |
85.27+0.61 −0.73° |
1.33+0.61 −0.33 RJ |
References
- ^ 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.
- ^ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2013-02-01). "The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". The Astronomical Journal. 145 (2): 44. arXiv:1212.6182. Bibcode:2013AJ....145...44Z. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. S2CID 119299381.
- ^ Bayliss, Daniel; Gillen, Edward; Eigmuller, Philipp; McCormac, James; Alexander, Richard D.; Armstrong, David J.; Booth, Rachel S.; Bouchy, Francois; Burleigh, Matthew R.; Cabrera, Juan; Casewell, Sarah L. (April 21, 2018). "NGTS-1b: A hot Jupiter transiting an M-dwarf". Monthly Notices of the Royal Astronomical Society. 475 (4): 4467–4475. arXiv:1710.11099. Bibcode:2018MNRAS.475.4467B. doi:10.1093/mnras/stx2778. ISSN 0035-8711.
- Denis, Consortium (2005-09-01). "VizieR Online Data Catalog: The DENIS database (DENIS Consortium, 2005)". VizieR Online Data Catalog: B/denis. Bibcode:2005yCat.2263....0D.
- 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.
- "NGTS-1b – Scientists Find a Baffling New Monster Planet". Facts Legend. 2017-11-06. Archived from the original on 2018-01-14. Retrieved 2021-02-18.
- Kokori, A.; et al. (March 1, 2023). "ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations". The Astrophysical Journal Supplement Series. 265 (1): 4. arXiv:2209.09673. Bibcode:2023ApJS..265....4K. doi:10.3847/1538-4365/ac9da4. ISSN 0067-0049. S2CID 252383631.
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