Mu2 Scorpii information

μ² Scorpii
(Pipirima)
	Location of μ2 Scorpii (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Scorpius
Right ascension	16h 52m 20.14532s
Declination	−38° 01′ 03.1258″
Apparent magnitude (V)	+3.56
Characteristics
Spectral type	B2 IV
U−B color index	−0.878
B−V color index	−0.219
Astrometry
Radial velocity (Rv)	+1.4 km/s
Proper motion (μ)	RA: −11.09 mas/yr ; Dec.: −23.32 mas/yr
Parallax (π)	6.88 ± 0.12 mas
Distance	474 ± 8 ly ; (145 ± 3 pc)
Absolute magnitude (MV)	−2.25
Details
Mass	8.7±0.2 M☉
Radius	7.0 R☉
Luminosity	2,385 L☉
Temperature	23,113 K
Rotational velocity (v sin i)	58 km/s
Age	18.5±3.2 Myr
Other designations
	Pipirima, μ2 Scorpii, CD−37° 11037, HD 151985, HIP 82545, HR 6252, SAO 208116.
Database references
SIMBAD	data

Mu² Scorpii (μ² Scorpii, abbreviated Mu² Sco, μ² Sco), also named Pipirima /pɪˈpɪrɪmə/,^[11] is a star in the zodiac constellation of Scorpius. It has an apparent visual magnitude of +3.56,^[2] which is bright enough to be seen with the naked eye. Its distance from the Sun is about 474 light-years, as determined by parallax measurements.^[1] It is a member of the Upper Centaurus–Lupus subgroup of the Scorpius–Centaurus association.^[12]

^ ^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 Gutierrez-Moreno1968 was invoked but never defined (see the help page).
^ Cite error: The named reference Hiltner1969 was invoked but never defined (see the help page).
^ Cite error: The named reference rgcrv was invoked but never defined (see the help page).
^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Underhill1979 was invoked but never defined (see the help page).
^ Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
^ Cite error: The named reference Uesugi1970 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ "Naming Stars". IAU.org. Retrieved 16 December 2017.
^ Cite error: The named reference Bobylev2007 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).

[Gutierrez-Moreno1968-2] Cite error: The named reference Gutierrez-Moreno1968 was invoked but never defined (see the help page).

[Hiltner1969-3] Cite error: The named reference Hiltner1969 was invoked but never defined (see the help page).

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

[Anderson2012-5] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[Tetzlaff2011-6] Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).

[Underhill1979-7] Cite error: The named reference Underhill1979 was invoked but never defined (see the help page).

[Mcdonald2012-8] Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).

[Uesugi1970-9] Cite error: The named reference Uesugi1970 was invoked but never defined (see the help page).

[SIMBAD-10] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[IAU-LSN-11] "Naming Stars". IAU.org. Retrieved 16 December 2017.

[Bobylev2007-12] Cite error: The named reference Bobylev2007 was invoked but never defined (see the help page).

Observation data Epoch J2000 Equinox J2000
Location of μ² Scorpii (circled)
Constellation	Scorpius
Right ascension	16^h 52^m 20.14532^s^[1]
Declination	−38° 01′ 03.1258″^[1]
Apparent magnitude (V)	+3.56^[2]
Characteristics
Spectral type	B2 IV^[3]
U−B color index	−0.878^[2]
B−V color index	−0.219^[2]
Astrometry

Radial velocity (R_v)	+1.4^[4] km/s
Proper motion (μ)	RA: −11.09^[1] mas/yr Dec.: −23.32^[1] mas/yr
Parallax (π)	6.88 ± 0.12 mas^[1]
Distance	474 ± 8 ly (145 ± 3 pc)
Absolute magnitude (M_V)	−2.25^[5]

Details

Mass	8.7±0.2^[6] `M`_☉
Radius	7.0^[7] `R`_☉
Luminosity	2,385^[8] `L`_☉
Temperature	23,113^[7] K
Rotational velocity (v sin i)	58^[9] km/s
Age	18.5±3.2^[6] Myr

Other designations
Pipirima, μ² Scorpii, CD−37° 11037, HD 151985, HIP 82545, HR 6252, SAO 208116.^[10]
Database references
SIMBAD	data

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