NGTS-3

Binary star in the constellation Columba.

NGTS-3  Observation data
Epoch J2000 Equinox J2000

Constellation | Columba
Right ascension | 06h 17m 46.75s[1]
Declination | −35° 42′ 23.05″[1]
Apparent magnitude (V) | 14.67±0.01[2]
Characteristics
Spectral type | G6 V + K1 V
B−V color index | +0.77[2]
R−I color index | +0.36[2]
Astrometry
Radial velocity (Rv)| 8.57±0.05[3] km/s
Proper motion (μ)|  RA: -8.838[1] mas/yr
Dec.: +8.771[1] mas/yr
Parallax (π)| 1.3153 ± 0.0193 mas[1]
Distance| 2,480 ± 40 ly
(760 ± 10 pc)
Details[3]

Mass| 1.02±0.09 M☉
Radius| 0.93±0.23 R☉
Luminosity| 0.72±0.03[1] L☉
Surface gravity (log g)| 4.45[4] cgs
Temperature| 5,600±150 K
Metallicity [Fe/H]| 0.12±0.15 dex
Rotational velocity (v sin i)| 1.0±0.7 km/s
Other designations

Gaia DR2 2885350546895266432

Database references
SIMBAD| data
Exoplanet Archive| data

NGTS-3 is a star system located in the southern constellation Columba. With an apparent magnitude of 14.67, it requires a powerful telescope to observe. However, NGTS-3 is actually an unresolved spectroscopic binary system. The system is located approximately 2,480 light years away, based on parallax measurement, and is receding with a radial velocity of 8.57 km/s.

The system consists of two main sequence stars, classified as G6 and K1, respectively; however, only the properties of the primary star are known. NGTS-3A has a similar mass to that of the Sun, but is 7% smaller in radius. It radiates at 72% of the Sun's luminosity from its photosphere at an effective temperature of 5,600 K, which gives it the typical yellow hue characteristic of a G-type star.

## Planetary System

[edit]

In 2018, the NGTS survey discovered an inflated hot Jupiter orbiting NGTS-3A despite the components being visually unresolved.[3]

The NGTS-3A planetary system[3] Companion
(in order from star) | Mass | Semimajor axis
(AU) | Orbital period
(days) | Eccentricity | Inclination | Radius

|
|
|
|
|
|

b | 2.38 ± 0.26 MJ | 0.023+0.007
−0.005 | 1.6753728 ± 0.0000030  | 0?  | 89.56+0.31
−0.48° | 1.48 ± 0.37 RJ

## References

[edit]

1. ^ a b c d e f 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. ^ a b c Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (February 2013). "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. ^ a b c d Günther, Maximilian N.; et al. (August 2018). "Unmasking the hidden NGTS-3Ab: a hot Jupiter in an unresolved binary system". Monthly Notices of the Royal Astronomical Society. 478 (4): 4720–4737\. arXiv:1805.01378. Bibcode:2018MNRAS.478.4720G. doi:10.1093/mnras/sty1193. ISSN 0035-8711.4720-4737&rft.date=2018-08&rft_id=info:arxiv/1805.01378&rft.issn=0035-8711&rft_id=info:doi/10.1093/mnras/sty1193&rft_id=info:bibcode/2018MNRAS.478.4720G&rft.aulast=Günther&rft.aufirst=Maximilian+N.&rft.au=Queloz,+Didier&rft.au=Gillen,+Edward&rft.au=Delrez,+Laetitia&rft.au=Bouchy,+François&rft.au=McCormac,+James&rft.au=Smalley,+Barry&rft.au=Almleaky,+Yaseen&rft.au=Armstrong,+David+J.&rft.au=Bayliss,+Daniel&rft.au=Burdanov,+Artem&rft.au=Burleigh,+Matthew&rft.au=Cabrera,+Juan&rft.au=Casewell,+Sarah+L.&rft.au=Cooke,+Benjamin+F.&rft.au=Csizmadia,+Szilárd&rft.au=Ducrot,+Elsa&rft.au=Eigmüller,+Philipp&rft.au=Erikson,+Anders&rft.au=Gänsicke,+Boris+T.&rft.au=Gibson,+Neale+P.&rft.au=Gillon,+Michaël&rft.au=Goad,+Michael+R.&rft.au=Jehin,+Emmanuël&rft.au=Jenkins,+James+S.&rft.au=Louden,+Tom&rft.au=Moyano,+Maximiliano&rft.au=Murray,+Catriona&rft.au=Pollacco,+Don&rft.au=Poppenhaeger,+Katja&rft.au=Rauer,+Heike&rft.au=Raynard,+Liam&rft.au=Smith,+Alexis+M.+S.&rft.au=Sohy,+Sandrine&rft.au=Thompson,+Samantha+J.&rft.au=Udry,+Stéphane&rft.au=Watson,+Christopher+A.&rft.au=West,+Richard+G.&rft.au=Wheatley,+Peter+J.&rft_id=https://doi.org/10.1093%2Fmnras%2Fsty1193&rfr_id=info:sid/en.wikipedia.org:NGTS-3" class="Z3988">
4. ^ Stassun, Keivan G.; et al. (October 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. hdl:1721.1/124721. ISSN 0004-6256. S2CID 166227927.

* v
* t
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Constellation of Columba

* List of stars in Columba
* Columba in Chinese astronomy

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

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* e

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*[RA:]: Right Ascension
*[Dec.:]: Declination
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*[e]: Edit this template