HD 191984

HD 191984
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquila
	A
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	6.246
	B
Right ascension	Template:RA
Declination	Template:DEC
Apparent magnitude (V)	6.246
Characteristics
Spectral type	B9p CR(EU SR) + A0
U−B Template:Engvar	−0.033
B−V Template:Engvar	+0.090
Astrometry
A
Radial velocity (Rv)	−19.0 km/s
Proper motion (μ)	RA: +1.577 mas/yr ; Dec.: −21.256 mas/yr
Parallax (π)	6.4490±0.0534 mas
Distance	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd pc)
B
Radial velocity (Rv)	−21.0 km/s
Proper motion (μ)	RA: +4.733 mas/yr ; Dec.: −17.988 mas/yr
Parallax (π)	6.5263±0.0318 mas
Distance	Template:Rnd ± Template:Rnd ly ; (Template:Rnd ± Template:Rnd pc)
Details
A
Mass	2.6 Template:Solar mass
Radius	2.5 Template:Solar radius
Luminosity	60 Template:Solar luminosity
Surface gravity (log g)	3.96 cgs
Temperature	10,497 K
Metallicity [Fe/H]	−1.00 dex
Rotational velocity (v sin i)	150 km/s
Age	262 Myr
B
Mass	2.2 Template:Solar mass
Radius	2.3 Template:Solar radius
Luminosity	31 Template:Solar luminosity
Surface gravity (log g)	3.87 cgs
Temperature	8,801 K
Metallicity [Fe/H]	−1.42 dex
Age	574 Myr
Other designations
	BD+00°4444, HD 191984, HIP 99585, HR 7717.
Database references
SIMBAD	data
	A
	B

Script error: No such module "Check for unknown parameters".

HD 191984 is a double star in the equatorial constellation of Aquila. As of 2011, the components have an angular separation of 2.52″ along a position angle of 205.7°.^[9]

References

Script error: No such module "Check for unknown parameters".

Observation data Epoch J2000 Equinox J2000
Constellation	Aquila^[1]
A
Right ascension	Template:RA^[2]
Declination	Template:DEC^[2]
Apparent magnitude (V)	6.246^[3]
B
Right ascension	Template:RA^[4]
Declination	Template:DEC^[4]
Apparent magnitude (V)	6.246^[3]
Characteristics
Spectral type	B9p CR(EU SR)^[5] + A0^[6]
U−B Template:Engvar	−0.033^[3]
B−V Template:Engvar	+0.090^[3]
Astrometry
A
Radial velocity (R_v)	−19.0^[7] km/s
Proper motion (μ)	RA: +1.577^[2] mas/yr Dec.: −21.256^[2] mas/yr
Parallax (π)	6.4490±0.0534 mas^[2]
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
B
Radial velocity (R_v)	−21.0^[7] km/s
Proper motion (μ)	RA: +4.733^[4] mas/yr Dec.: −17.988^[4] mas/yr
Parallax (π)	6.5263±0.0318 mas^[4]
Distance	Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)
Details
A
Mass	2.6^[2] Template:Solar mass
Radius	2.5^[2] Template:Solar radius
Luminosity	60^[2] Template:Solar luminosity
Surface gravity (log g)	3.96^[2] cgs
Temperature	10,497^[2] K
Metallicity [Fe/H]	−1.00^[2] dex
Rotational velocity (v sin i)	150^[8] km/s
Age	262^[2] Myr
B
Mass	2.2^[4] Template:Solar mass
Radius	2.3^[4] Template:Solar radius
Luminosity	31^[4] Template:Solar luminosity
Surface gravity (log g)	3.87^[4] cgs
Temperature	8,801^[4] K
Metallicity [Fe/H]	−1.42^[4] dex
Age	574^[4] Myr
Other designations
BD+00°4444, HD 191984, HIP 99585, HR 7717.
Database references
SIMBAD	data
	A
	B