Mu Pictoris

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Mu Pictoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pictor
μ Pic A
Right ascension 06h 31m 58.31011s[1]
Declination −58° 45′ 13.8114″[1]
Apparent magnitude (V) 5.71[2]
μ Pic B
Right ascension 06h 31m 58.0685s[3]
Declination −58° 45′ 15.4103″[3]
Apparent magnitude (V) 9.43[2]
Characteristics
Spectral type B9 Ve[4] or B9 IVn + A8 V:p?[5]
U−B color index −0.17[6]
B−V color index −0.06[6]
Astrometry
μ Pic A
Radial velocity (Rv)+0.40±1.00[7] km/s
Proper motion (μ) RA: −1.302 mas/yr[1]
Dec.: +1.637 mas/yr[1]
Parallax (π)5.3553±0.0358 mas[1]
Distance609 ± 4 ly
(187 ± 1 pc)
Absolute magnitude (MV)0.20[8]
μ Pic B
Proper motion (μ) RA: +0.881 mas/yr[3]
Dec.: +0.918 mas/yr[3]
Parallax (π)5.3644±0.0286 mas[3]
Distance608 ± 3 ly
(186.4 ± 1.0 pc)
Absolute magnitude (MV)3.75[8]
Details
μ Pic A
Mass3.32[1] M☉
Radius4.43[1] R☉
Luminosity205[1] L☉
Surface gravity (log g)3.612[1] cgs
Temperature10,375[1] K
Rotational velocity (v sin i)228[9] km/s
Age258[1] Myr
μ Pic B
Mass1.18[10] M☉
Radius1.26[11] R☉
Luminosity5.23[11] L☉
Surface gravity (log g)4.25[10] cgs
Temperature7,770[11] K
Other designations
μ Pic, CPD−58°722, HD 46860, HIP 31137, HR 2412, SAO 234564[12]
Database references
SIMBADμ Pic A
μ Pic B

μ Pictoris, Latinised as Mu Pictoris, is a binary star[2] system in the southern constellation Pictor. It is bright enough to be dimly visible to the naked eye, having a combined apparent visual magnitude of 5.69.[6] Based upon an annual parallax shift of 5.4 mas as seen from Earth,[1] the system is located roughly 610 light years distant from the Sun. As of 2010, the pair have an angular separation of 2.46 arc seconds along a position angle of 221°.[4]

The primary, designated component A, is a blue-white star with a visual magnitude of 5.71[2] and a stellar classification of B9 Ve[4] or B9 IVn.[5] The first classification suggests is a B-type main-sequence star, with the 'e' suffix indicating a Be star. The second may instead indicate a somewhat more evolved B-type star that is spinning rapidly, resulting in "nebulous" absorption lines. Photometrically, it shows a pulsation period of 0.397 days, which is likely the same as the rotation period.[13]

The secondary companion, component B, is a white-hued star of magnitude 9.43[2] with a classification of A8 V:p?.[5] This indicates it is an A-type main-sequence star, with the 'p?' suffix suggesting it may be chemically peculiar while the ':' notation says there is some uncertainty about the general classification. The star has a radius of 1.26 R☉ and a luminosity around 5.2 L☉,[11] values unusually low compared to the average for an A8-type dwarf star.[14]

References

[edit | edit source]
  1. ^ a b c d e f g h i j k Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  2. ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  3. ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  4. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  6. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  8. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  9. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  10. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  11. ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR2 record for this source at VizieR.
  12. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  13. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  14. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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