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Star in the constellation Microscopium
ι Microscopii ,
Latinized as Iota Microscopii , is a suspected
astrometric binary
[10]
star system in the southern
constellation of
Microscopium , near the southern constellation border with
Indus . It is visible to the naked eye as a dim, yellow-white hued point of light with an
apparent visual magnitude of 5.11.
[2] This object is 121
light years from the Sun based on
parallax , but is drifting closer with a
radial velocity of −14 km/s.
[1]
The visible component is an ordinary
F-type main-sequence star with a
stellar classification of F2V,
[3] which indicates it is generating energy through
core
hydrogen fusion . It is around a billion years old with 1.4 times the
mass of the Sun
[6] and 2.4
[7] times the
Sun's radius . The star is radiating 13
[2] times the
luminosity of the Sun from its
photosphere at an
effective temperature of 6,997 K.
[6] It has a high rate of spin with a
projected rotational velocity of 115 km/s, which is giving the star an
equatorial bulge that is 6% larger than the polar radius.
[8]
Iota Microscopii has one visual companion, first observed in 1932, with a separation of 4.3" and a visual magnitude of 15.5.
[11]
References
^
a
b
c
d
e
f
Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018).
"Gaia Data Release 2: Summary of the contents and survey properties" .
Astronomy & Astrophysics . 616 . A1.
arXiv :
1804.09365 .
Bibcode :
2018A&A...616A...1G .
doi :
10.1051/0004-6361/201833051 .
Gaia DR2 record for this source at
VizieR .
^
a
b
c
d
e
f Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331.
arXiv :
1108.4971 .
Bibcode :
2012AstL...38..331A .
doi :
10.1134/S1063773712050015 .
S2CID
119257644 .
Vizier catalog entry
^
a
b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars . Vol. 2. Ann Arbor: Department of Astronomy, University of Michigan.
Bibcode :
1978mcts.book.....H .
^ Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie . 2168 .
Bibcode :
2006yCat.2168....0M .
Vizier catalog entry
^ Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers . 42 (2): 443.
Bibcode :
2014JAVSO..42..443M .
Vizier catalog entry
^
a
b
c
d
e
f David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal . 804 (2): 146.
arXiv :
1501.03154 .
Bibcode :
2015ApJ...804..146D .
doi :
10.1088/0004-637X/804/2/146 .
S2CID
33401607 .
Vizier catalog entry
^
a
b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics . 352 : 555–562.
arXiv :
astro-ph/9911002 .
Bibcode :
1999A&A...352..555A .
Vizier catalog entry
^
a
b van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review , 20 (1): 51,
arXiv :
1204.2572 ,
Bibcode :
2012A&ARv..20...51V ,
doi :
10.1007/s00159-012-0051-2 ,
S2CID
119273474
^
"iot Mic" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2019-09-04 .
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems".
Monthly Notices of the Royal Astronomical Society . 389 (2): 869–879.
arXiv :
0806.2878 .
Bibcode :
2008MNRAS.389..869E .
doi :
10.1111/j.1365-2966.2008.13596.x .
S2CID
14878976 .
^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001).
"The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" . The Astronomical Journal . 122 (6): 3466.
Bibcode :
2001AJ....122.3466M .
doi :
10.1086/323920 .
Vizier catalog entry