HD 984 information

HD 984
	; HD 984 is the brightest star in this Sloan Digital Sky Survey image. The spiral galaxy NGC 47 can be seen at upper left.
Observation data; Epoch J2000 Equinox J2000
Constellation	Cetus
Right ascension	00h 14m 10.25s
Declination	−07° 11′ 56.82″
Apparent magnitude (V)	7.32
Characteristics
A
Evolutionary stage	F-type main-sequence star
Spectral type	F7V
B−V color index	0.522±0.01
B
Evolutionary stage	Brown dwarf
Spectral type	M6.5±1.5
Apparent magnitude (J)	13.28±0.06
Apparent magnitude (H)	12.6±0.05
Astrometry
Radial velocity (Rv)	1.04±0.25 km/s
Proper motion (μ)	RA: 104.775 mas/yr ; Dec.: −68.016 mas/yr
Parallax (π)	21.877 ± 0.0249 mas
Distance	149.1 ± 0.2 ly ; (45.71 ± 0.05 pc)
Absolute magnitude (MV)	3.95±0.07
Orbit
Primary	A
Companion	B
Period (P)	140+50; −30 yr
Semi-major axis (a)	28+7; −4 AU
Eccentricity (e)	0.76±0.05
Inclination (i)	120.8+1.8; −1.6°
Details
A
Mass	1.2±0.06 M☉
Radius	1.247±0.053 R☉
Luminosity	2.218 L☉
Surface gravity (log g)	4.38±0.06 cgs
Temperature	6326±80 K
Metallicity [Fe/H]	−0.01±0.12 dex
Rotation	1.39±0.05 d
Rotational velocity (v sin i)	42.13±1.65 km/s
Age	30–200 Myr
B
Mass	61±4 MJup
Radius	0.162 R☉
Luminosity	1.318×10−3 L☉
Temperature	2730+120; −180 K
Metallicity [Fe/H]	−0.62±0.02 dex
Rotational velocity (v sin i)	12.72+0.03; −0.02 km/s
Position (relative to A)
Component	B
Epoch of observation	2015
Angular distance	201.6±0.4 mas
Position angle	92.2±0.5°
Other designations
	BD−08 24, Gaia DR2 2431157720981843200, Gaia DR3 2431157720981843200, HIP 1134, SAO 128650, PPM 182008, TIC 408012676, TYC 4670-773-1, GSC 04670-00773, 2MASS J00141025-0711569
Database references
SIMBAD	data

HD 984 is a F-type main-sequence star located in the equatorial constellation Cetus. It is a young star, estimated 30 to 200 million years old, and is orbited by a brown dwarf companion. Parallax measurements by the Gaia spacecraft imply a distance of 150 light-years (46 pc) to HD 984. At an apparent magnitude of 7.32, the star is too dim to be visible to the naked eye.

^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference costes was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g ^h Cite error: The named reference meshkat was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference dynamical was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference johnson-groh was invoked but never defined (see the help page).
^ Cite error: The named reference bowler was invoked but never defined (see the help page).

Cite error: There are <ref group=note> tags on this page, but the references will not show without a {{reflist|group=note}} template (see the help page).
Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).

[GaiaDR3-1] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).

[SIMBAD-3] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[costes-4] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference costes was invoked but never defined (see the help page).

[meshkat-5] ^ ^a ^b ^c ^d ^e ^f ^g ^h Cite error: The named reference meshkat was invoked but never defined (see the help page).

[dynamical-6] Cite error: The named reference dynamical was invoked but never defined (see the help page).

[johnson-groh-7] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference johnson-groh was invoked but never defined (see the help page).

[bowler-8] Cite error: The named reference bowler was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
HD 984 is the brightest star in this Sloan Digital Sky Survey image. The spiral galaxy NGC 47 can be seen at upper left.
Constellation	Cetus^{[note 1]}
Right ascension	00^h 14^m 10.25^s^[1]
Declination	−07° 11′ 56.82″^[1]
Apparent magnitude (V)	7.32^[2]
Characteristics
A
Evolutionary stage	F-type main-sequence star^[3]
Spectral type	F7V^[3]
B−V color index	0.522±0.01^[4]
B
Evolutionary stage	Brown dwarf^[4]^[5]
Spectral type	M6.5±1.5^[6]
Apparent magnitude (J)	13.28±0.06^[6]
Apparent magnitude (H)	12.6±0.05^[6]
Astrometry

Radial velocity (R_v)	1.04±0.25^[1] km/s
Proper motion (μ)	RA: 104.775 mas/yr^[1] Dec.: −68.016 mas/yr^[1]
Parallax (π)	21.877 ± 0.0249 mas^[1]
Distance	149.1 ± 0.2 ly (45.71 ± 0.05 pc)^[1]
Absolute magnitude (M_V)	3.95±0.07^[4]

Orbit^[5]
Primary	A
Companion	B
Period (P)	140+50 −30 yr
Semi-major axis (a)	28+7 −4 AU
Eccentricity (e)	0.76±0.05
Inclination (i)	120.8+1.8 −1.6°
Details
A
Mass	1.2±0.06^[4] `M`_☉
Radius	1.247±0.053^[4] `R`_☉
Luminosity	2.218^[6] `L`_☉
Surface gravity (log g)	4.38±0.06^[3] cgs
Temperature	6326±80^[3] K
Metallicity [Fe/H]	−0.01±0.12^[3] dex
Rotation	1.39±0.05^[7] d
Rotational velocity (v sin i)	42.13±1.65^[4] km/s
Age	30–200^[4] Myr
B
Mass	61±4^[5] M_Jup
Radius	0.162^[6]^[a] `R`_☉
Luminosity	1.318×10⁻³^[6] `L`_☉
Temperature	2730+120 −180^[6] K
Metallicity [Fe/H]	−0.62±0.02^[3]^{[note 2]} dex
Rotational velocity (v sin i)	12.72+0.03 −0.02^[3] km/s
Position (relative to A)^[4]

Component	B
Epoch of observation	2015
Angular distance	201.6±0.4 mas
Position angle	92.2±0.5°
Other designations
BD−08 24, Gaia DR2 2431157720981843200, Gaia DR3 2431157720981843200, HIP 1134, SAO 128650, PPM 182008, TIC 408012676, TYC 4670-773-1, GSC 04670-00773, 2MASS J00141025-0711569
Database references
SIMBAD	data

HD 984 information

and 25 Related for: HD 984 information

HD 984

List of smallest known stars

List of stars in Cetus

Zeta Ceti

Rho Ceti

Chi Ceti

3C 75

List of brown dwarfs

Theta Ceti

9io9

Iota Ceti

Phi4 Ceti

Epsilon Ceti

Cetus Dwarf

Kappa2 Ceti

9 Ceti

Pi Ceti

Arp 147

SN 2005gj

Phi3 Ceti

Upsilon Ceti

Phi1 Ceti

Arp 256

Sigma Ceti

13 Ceti