Mu Hydrae information

μ Hydrae
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Hydra
Right ascension	10h 26m 05.42630s
Declination	−14° 19′ 56.2675″
Apparent magnitude (V)	3.83
Characteristics
Spectral type	K4 III
U−B color index	+1.83
B−V color index	+1.47
Variable type	Suspected
Astrometry
Radial velocity (Rv)	+40.81±0.36 km/s
Proper motion (μ)	RA: −129.17 mas/yr ; Dec.: −79.76 mas/yr
Parallax (π)	13.93 ± 0.18 mas
Distance	234 ± 3 ly ; (71.8 ± 0.9 pc)
Absolute magnitude (MV)	−0.45
Details
Radius	45 R☉
Luminosity	332 L☉
Surface gravity (log g)	1.5 cgs
Temperature	3,999±8 K
Metallicity [Fe/H]	−0.12 dex
Rotational velocity (v sin i)	6.0 km/s
Other designations
	μ Hya, 42 Hydrae, BD−16° 3052, FK5 389, HD 90432, HIP 51069, HR 4094, SAO 155980.
Database references
SIMBAD	data

μ Hydrae, Latinised as Mu Hydrae, is a solitary,^[8] orange-hued star in the equatorial constellation of Hydra. It is visible to the naked eye with an apparent visual magnitude of 3.83.^[2] Positioned just 1.8° to the south-southwest is the planetary nebula NGC 3242.^[9] Mu Hydrae has an annual parallax shift of 13.93 mas,^[1] which yields a distance estimate of 234 light years.

This is an evolved K-type giant star with a stellar classification of K4 III,^[3] having used up its core hydrogen and has expanded to around 45 times the radius of the Sun.^[5] It is a suspected variable star, with a brightness that varies about 0.03 in magnitude.^[4] The relatively cool outer atmosphere has an effective temperature of 3999 K.^[5]

^ ^a ^b ^c ^d ^e ^f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Houk1988 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference gcvs2009 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
^ Cite error: The named reference OMeara2007 was invoked but never defined (see the help page).

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).

[Mermilliod1986-2] Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).

[Houk1988-3] Cite error: The named reference Houk1988 was invoked but never defined (see the help page).

[gcvs2009-4] Cite error: The named reference gcvs2009 was invoked but never defined (see the help page).

[Massarotti2008-5] Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).

[Anderson2012-6] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[SIMBAD-7] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[Eggleton2008-8] Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).

[OMeara2007-9] Cite error: The named reference OMeara2007 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Hydra
Right ascension	10^h 26^m 05.42630^s^[1]
Declination	−14° 19′ 56.2675″^[1]
Apparent magnitude (V)	3.83^[2]
Characteristics
Spectral type	K4 III^[3]
U−B color index	+1.83^[2]
B−V color index	+1.47^[2]
Variable type	Suspected^[4]
Astrometry

Radial velocity (R_v)	+40.81±0.36^[5] km/s
Proper motion (μ)	RA: −129.17^[1] mas/yr Dec.: −79.76^[1] mas/yr
Parallax (π)	13.93 ± 0.18 mas^[1]
Distance	234 ± 3 ly (71.8 ± 0.9 pc)
Absolute magnitude (M_V)	−0.45^[6]

Details^[5]

Radius	45 `R`_☉
Luminosity	332^[6] `L`_☉
Surface gravity (log g)	1.5 cgs
Temperature	3,999±8 K
Metallicity [Fe/H]	−0.12 dex
Rotational velocity (v sin i)	6.0 km/s

Other designations
μ Hya, 42 Hydrae, BD−16° 3052, FK5 389, HD 90432, HIP 51069, HR 4094, SAO 155980.^[7]
Database references
SIMBAD	data

Mu Hydrae information

and 19 Related for: Mu Hydrae information

Mu Hydrae

Upsilon1 Hydrae

Kappa Hydrae

List of brightest natural objects in the sky

List of smallest known stars

List of Nakshatras

Flag of Brazil

Bow shock

Water

Stellar kinematics

Magnetosphere

Nakshatra

Feng shui

Methanol

Zeta Aquilae

HD 82943

List of Arabic star names

Star system

List of astronomy acronyms