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NGTS-1 - Wikipedia

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NGTS-1
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Columba
Right ascension	05^h 30^m 51.45227^s^[1]
Declination	−36° 37′ 50.8957″^[1]
Apparent magnitude (V)	15.57±0.03^[2]
Characteristics
Evolutionary stage	main sequence star^[3]
Spectral type	M0.5^[3]
B−V color index	+1.37^[2]
R−I color index	+1.39^[4]
Astrometry

Radial velocity (R_v)	97.18±0.01^[3] km/s
Proper motion (μ)	RA: −31.887 mas/yr^[1] Dec.: −41.077 mas/yr^[1]
Parallax (π)	4.5935 ± 0.017 mas^[1]
Distance	710 ± 3 ly (217.7 ± 0.8 pc)

Details^[3]

Mass	0.617^+0.023 _−0.062 `M`_☉
Radius	0.573±0.077 `R`_☉
Luminosity	(7.03±0.09)×10⁻²^[5] `L`_☉
Surface gravity (log g)	4.71±0.23 cgs
Temperature	3,916⁺⁷¹ ₋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,^[2] NGTS-1 can only be seen through a powerful telescope. Gaia DR3 parallax measurements imply a distance of 710 light-years^[1] and it is drifting away rapidly with a heliocentric radial velocity of 97.2 km/s.^[3]

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.^[3] 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.^[3] There was difficulty determining the metallicity of the object due to its faintness, but NGTS-1 is assumed to be around solar metallicity.^[3] 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.^[3]

Planetary system

The discovery of a hot Jupiter orbiting the star was reported in 2017 as part of the Next Generation Transit Survey.^[3] The media also dubbed NGTS-1b as "monstrous" since the planet is relatively large compared to its host star.^[6]

The NGTS-1 planetary system^[3]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.812+0.066 −0.075 $M$ _J	0.0326+0.0047 −0.0045	2.6473068±0.0000017^[7]	0.016+0.023 −0.012	85.27+0.61 −0.73°	1.33+0.61 −0.33 $R$ _J

References

^ ^a ^b ^c ^d ^e 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.
^ ^a ^b ^c 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k 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.

Constellation of Columba

Stars

Bayer	α (Phact) β (Wazn) γ δ ε η θ (Elkurud) κ λ (Tsze) μ ν¹ ν² ξ ο π¹ π² σ
Variable	WZ AF AP
HR	1721 1758 1835 1877 1958 2069 2082 2131 2149 2263 2288 2399 2411 2445 2446
HD	43848
Other	NGTS-1 NGTS-3 WASP-63

Exoplanets	NGTS-1b NGTS-3Ab NGTS-4b WASP-63b

Star clusters	NGC 1851

Galaxies

NGC	1792 1808 1989 1992 2090
Other	ESO 306-17 PKS 0521-365