IC 2602

IC 2602

IC 2602, an open cluster in Carina
Observation data (J2000 epoch)
Constellation Carina
Right ascension 10h 42m 57.5s[1]
Declination −64° 23′ 39″
Distance 547 ly[2] (167.7 pc)
Apparent magnitude (V) 1.9[3]
Apparent dimensions (V) 50′ × 50′
Physical characteristics
Mass 74 M☉
Estimated age 13.7 M.yr−1
Other designations Theta Carinae Cluster, Caldwell 102, Melotte 102, Collinder 229, VDBH 103[2]

IC 2602, generally known as the Southern Pleiades or Theta Carinae Cluster, is an open cluster in the constellation Carina that was discovered by Abbe Lacaille in 1751 from South Africa. Easily seen with the naked eye, this cluster is one of the closest to us, whose distance is about 167.7 parsecs (547 light-years) away from Earth.

The Southern Pleiades (IC 2602) has a total apparent magnitude of 1.9, which is 70% fainter than the Taurean Pleiades, and contains about seventy-four stars. It is the third-brightest open cluster in the sky, following the Hyades. Like its northern counterpart, the Southern Pleiades spans a sizeable area of sky, approximately 50 arcminutes, so it is best viewed with large binoculars or telescope with a wide-angle eyepiece.

Theta Carinae is the brightest star within the open cluster, being third-magnitude with the apparent photometric magnitude of +2.74. All the other stars within the cluster are of the fifth magnitude and fainter. The cluster is thought to have the same age as the open cluster IC 2391,[4] which has a lithium depletion boundary age of 50 million years old,[5] though the accepted true age is 13.7 million years.[6] IC 2602 is also likely part of the Lower Scorpius-Centaurus OB Association.[7][8]

See also

References

  1. ↑ "NED results for object IC 2602". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 23 January 2017.
  2. 1 2 "IC 2602". SIMBAD. Centre de données astronomiques de Strasbourg.
  3. ↑ "IC 2602 - SEDS Messier Database". Retrieved 23 January 2016.
  4. ↑ Stauffer, J.R.; et al. (1997). "Rotational Velocities and Chromospheric/Coronal Activity of Low-Mass Stars in the Young Open Clusters IC 2391 and IC 2602". Astrophysical Journal. 479 (2): 776. Bibcode:1997ApJ...479..776S. doi:10.1086/303930.,
  5. ↑ Barrado y Navascues, D; Stauffer, J.R.; Jayawardhana, R. (2002). "Spectroscopy of Very Low Mass Stars and Brown Dwarfs in IC 2391: Lithium Depletion and Hα Emission". Astrophysical Journal. 614 (1): 386–397. Bibcode:2004ApJ...614..386B. arXiv:astro-ph/0406436 Freely accessible. doi:10.1086/423485.
  6. ↑ "WEBDA page for open cluster IC 2602". WEBDA. Retrieved 2017-04-11.
  7. ↑ Whiteoak, J.B. (1961). "A study of the galactic cluster IC 2602. I. A photoelectric and spectroscopic investigation". Monthly Notices of the Royal Astronomical Society. 123: 245–256. Bibcode:1961MNRAS.123..245W. doi:10.1093/mnras/123.3.245.
  8. ↑ Blaauw, A. (1964). "The O Associations in the Solar Neighborhood". Annual Review of Astronomy and Astrophysics. 2: 213–246. Bibcode:1964ARA&A...2..213B. doi:10.1146/annurev.aa.02.090164.001241.

Coordinates: 10h 42m 56s, −64° 23′ 42″

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