NGTS-1

NGTS-1 is a solitary red dwarf located in the constellation Columba (constellation). 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).

NGTS-1
Observation data
Epoch J2000.0      Equinox J2000.0
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 mas/yr[1]
Dec.: -41.025 mas/yr[1]
Parallax (π)4.5558 ± 0.0216 mas[1]
Distance716 ± 3 ly
(220 ± 1 pc)
Details[4]
Mass0.617+0.023
−0.062 M☉
Radius0.573 ± 0.077 R☉
Luminosity7.02 ± 0.09%[1] L☉
Surface gravity (log g)4.71 ± 0.23 cgs
Temperature3916+71
−63 K
Rotational velocity (v sin i)<1 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
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

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]

The NGTS-1 planetary system
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. 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.
  2. 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.
  3. 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.
  4. 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. (2018-04-21). "NGTS-1b: A hot Jupiter transiting an M-dwarf". Monthly Notices of the Royal Astronomical Society. 475 (4): 4467–4475. arXiv:1710.11099. doi:10.1093/mnras/stx2778. ISSN 0035-8711.
  5. "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.
  6. "NGTS-1b – Scientists Find a Baffling New Monster Planet". 2018-01-14. Archived from the original on 2018-01-14. Retrieved 2022-07-19.


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