Astronomy:NGTS-1
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Short description: High proper motion red dwarf
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 05h 30m 51.41s[1] |
| Declination | −36° 37′ 51.53″[1] |
| Apparent magnitude (V) | 15.524 ± 0.083[2] |
| Characteristics | |
| Spectral type | M0.5 V |
| B−V color index | +1.37[2] |
| R−I color index | +1.39[3] |
| Astrometry | |
| Radial velocity (Rv) | 97.18 ± 0.01[4] km/s |
| Proper motion (μ) | RA: -31.902[1] mas/yr Dec.: -41.025[1] mas/yr |
| Parallax (π) | 4.5558 ± 0.0216[1] mas |
| Distance | 716 ± 3 ly (220 ± 1 pc) |
| Details[4] | |
| Mass | 0.617+0.023 −0.062 M☉ |
| Radius | 0.573 ± 0.077 R☉ |
| Luminosity | 7.02 ± 0.09%[1] L☉ |
| Surface gravity (log g) | 4.71 ± 0.23 cgs |
| Temperature | 3916+71 −63 K |
| Rotational velocity (v sin i) | <1 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
NGTS-1 is a solitary red dwarf located in the constellation Columba. With an apparent magnitude of 15.52, it requires a powerful telescope to be seen. The star is located 716 light years away from the Solar System, and is drifting away with a high radial velocity of 97.2 km/s (60.4 mi/s).
Properties
NGTS-1 is an ordinary red dwarf with 61% the mass of the Sun, and is 42.7% smaller than the latter. It radiates at about 7% the Sun’s luminosity from its photosphere and has an effective temperature of 3,916 K, which gives it the orange hue of a M-type star. NGTS-1 has a solar metallicity, and rotates at a rate too low to be measured accurately.
Planetary system
The red dwarf is known to have one hot Jupiter orbiting it, which is very unusual for stars its type.[5][6]
| 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 |
2.647298±0.000020 | 0.016+0.023 −0.012 |
85.27+0.61 −0.73° |
1.33+0.61 −0.33 RJ |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 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. doi:10.1088/0004-6256/145/2/44. ISSN 0004-6256. Bibcode: 2013AJ....145...44Z. https://ui.adsabs.harvard.edu/abs/2013AJ....145...44Z.
- ↑ 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. https://ui.adsabs.harvard.edu/abs/2005yCat.2263....0D.
- ↑ 4.0 4.1 Bayliss, Daniel; Gillen, Edward; Eigmuller, Philipp; McCormac, James; Alexander, Richard D.; Armstrong, David J.; Booth, Rachel S.; Bouchy, Francois et al. (2018-04-21). "NGTS-1b: A hot Jupiter transiting an M-dwarf". Monthly Notices of the Royal Astronomical Society 475 (4): 4467–4475. doi:10.1093/mnras/stx2778. ISSN 0035-8711.
- ↑ "NGTS-1b – Scientists Find a Baffling New Monster Planet" (in en-US). 2017-11-06. https://factslegend.org/ngts-1b-hot-jupiter-baffling-new-monster-planet/.
- ↑ "NGTS-1b – Scientists Find a Baffling New Monster Planet". 2018-01-14. https://factslegend.org/ngts-1b-hot-jupiter-baffling-new-monster-planet/.
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