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IC 2391
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<h2 id="description">Description</h2> <p>IC 2391 is centred about 490 <a href="/facts/Light-year/IGc5NdQb">light-years</a> away from <a href="/facts/Earth/HLLmDfj0">Earth</a> and can be seen with the <a href="/facts/Naked_eye/ePEIa0lK">naked eye</a>. It contains about 30 stars with a total <a href="/facts/Visual_magnitude/7pCTF1Me">visual magnitude</a> of 2.5, spread out across 50 arcminutes. </p> <h2 id="member-stars">Member stars</h2> <p>These are some of the prominent members of IC 2391:<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> </p> <table><tbody><tr><th>Name</th><th>Apparentmagnitude (V)</th><th>Spectral type</th><th>Distance (<a href="/facts/Light_year/IGc5NdQb">LY</a>)</th></tr><tr><td>HD 74195 (<a href="/facts/%25CE%259F_Velorum/hPNzmpte">ο Velorum</a>)</td><td>3.63 varies<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a></td><td>B3/5(V)<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a></td><td>496±30.5<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a></td></tr><tr><td><a href="/facts/HD_74560/cE5jeb3A">HD 74560</a> (HY Velorum) sp. binary</td><td>4.815<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a></td><td>B3IV<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a></td><td>490.4±6.9<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a></td></tr><tr><td>HD 74146 (NZ Velorum) sp. binary</td><td>5.19<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a></td><td>B5IV<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a></td><td>497.3±7.5<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a></td></tr><tr><td>HD 74071 (HW Velorum)</td><td>5.44<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a></td><td>B5V<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a></td><td>519.9±7.5<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a></td></tr><tr><td>HD 74196 cepheid variable</td><td>5.61<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a></td><td>B9/A0<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a></td><td>502±4.1<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a></td></tr><tr><td>HD 74535 (KT Velorum) alpha2 CVn variable</td><td>5.47<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a></td><td>B9III(pSi)<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a></td><td>421±17.5<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a></td></tr><tr><td>HD 75466</td><td>6.27<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a></td><td>B8V<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a></td><td>479±2.8<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a></td></tr><tr><td>HD 73952</td><td>6.43<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a></td><td>B8V<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a></td><td>483±5.8<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a></td></tr><tr><td><a href="/facts/HD_74438/kTt7oaUm">HD 74438</a>, youngest known quadruple star.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a><a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a><a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a></td><td>7.58<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a></td><td>A2mA5-A8<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a></td><td>472±5.2<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a></td></tr></tbody></table> <p>The stars' era of formation is similar to open cluster <a href="/facts/IC_2602/pd51nl4J">IC 2602</a> in neighbouring Carina,<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> and has a <a href="/facts/Lithium_depletion_boundary/eycnmqNU">lithium depletion boundary</a> age of about 50 million years.<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a> The latter group averages about the same distance, placed at about 485 light years away.<a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a> </p> <h2 id="argus-association">Argus Association</h2> <p>The components formed at about the same time as a nearer group, known as the "Argus Association" which one motion model suggests began in their own nebula cloud. These are in a similar direction, roughly the Vela constellation, within the local galactic arm.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a> The supposed association may chiefly comprise:<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a> </p> <table><tbody><tr><th>Name</th><th>Constellation</th><th>Distance</th><th>Radial velocity</th></tr><tr><td><a href="/facts/Epsilon_Pavonis/5E0GkT8q">Epsilon Pavonis</a></td><td>Pavo</td><td>105</td><td>−6.7</td></tr><tr><td><a href="/facts/HD_88955/YnYUKSQa">HD 88955</a></td><td>Vela</td><td>100</td><td>+7.4</td></tr><tr><td><a href="/facts/HD_61005/oTBMboKT">HD 61005</a></td><td>Puppis</td><td>119</td><td>+22</td></tr></tbody></table> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Omicron_Velorum/hPNzmpte">Omicron Velorum</a></li></ul> <h2 id="external-links">External links</h2> Wikimedia Commons has media related to IC 2391. <ul><li>Frommert, Harmut (29 March 1998). <a href="http://messier.seds.org/xtra/ngc/i2391.html">"Omicron Velorum (IC 2391)"</a>. <i>SEDS Messier Database</i>. Students for the Exploration and Development of Space.</li> <li></li> <li>IC 2391 on <a href="/facts/WikiSky/P0lUw52f">WikiSky</a>: <a href="http://www.wikisky.org/?object=IC+2391&img_source=DSS2">DSS2</a>, <a href="http://www.wikisky.org/?object=IC+2391&img_source=SDSS">SDSS</a>, <a href="http://www.wikisky.org/?object=IC+2391&img_source=GALEX">GALEX</a>, <a href="http://www.wikisky.org/?object=IC+2391&img_source=IRAS">IRAS</a>, <a href="http://www.wikisky.org/?object=IC+2391&img_source=HALPHA">Hydrogen α</a>, <a href="http://www.wikisky.org/?object=IC+2391&img_source=RASS">X-Ray</a>, <a href="http://www.wikisky.org/?object=IC+2391&img_source=IMG_all">Astrophoto</a>, <a href="http://www.wikisky.org/?object=IC+2391">Sky Map</a>, <a href="http://www.wikisky.org/starview?object=IC+2391">Articles and images</a></li> <li><a href="http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=IC+2391">"IC 2391"</a>. <i><a href="/facts/SIMBAD/KD6tl6fW">SIMBAD</a></i>. <a href="/facts/Centre_de_donn%25C3%25A9es_astronomiques_de_Strasbourg/Hm4pKLBL">Centre de données astronomiques de Strasbourg</a>.</li> <li><a href="http://www.atlasoftheuniverse.com/openclus.html">"Open Cluster"</a>. <i>An Atlas of The Universe</i>.</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Jones, Kenneth Glyn; Society, Webb (1979). Webb Society Deep-sky Observer's Handbook: Open and globular clusters. Enslow Publishers. ISBN 978-0-89490-034-1. Retrieved 2025-04-18. <a href="978-0-89490-034-1" target="_blank">978-0-89490-034-1</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Rooney, Anne (2017-12-15). The History of Astronomy. The Rosen Publishing Group, Inc. ISBN 978-1-5081-7703-6. Retrieved 2025-04-18. <a href="978-1-5081-7703-6" target="_blank">978-1-5081-7703-6</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Platais, I; Melo, C; Mermilliod, J. -C; Kozhurina-Platais, V; Fulbright, J. P; Méndez, R. A; Altmann, M; Sperauskas, J (2007). "WIYN open cluster study. XXVI. Improved kinematic membership and spectroscopy of IC 2391". Astronomy and Astrophysics. 461 (2): 509. arXiv:astro-ph/0611584. Bibcode:2007A&A...461..509P. doi:10.1051/0004-6361:20065756. S2CID 17173564. <a href="/wiki/ArXiv_(identifier)" target="_blank">/wiki/ArXiv_(identifier)</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Reed, B. Cameron (2003). "Catalog of Galactic OB Stars". The Astronomical Journal. 125 (5): 2531. Bibcode:2003AJ....125.2531R. doi:10.1086/374771. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>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 href="/wiki/Anthony_Brown_(scientist)" target="_blank">/wiki/Anthony_Brown_(scientist)</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. <a href="https://doi.org/10.1051%2F0004-6361%2F202243940" target="_blank">https://doi.org/10.1051%2F0004-6361%2F202243940</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". Vizier Online Data Catalog. 2237. Bibcode:2002yCat.2237....0D. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. <a href="https://doi.org/10.1051%2F0004-6361%2F202243940" target="_blank">https://doi.org/10.1051%2F0004-6361%2F202243940</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. <a href="https://doi.org/10.1051%2F0004-6361%2F202243940" target="_blank">https://doi.org/10.1051%2F0004-6361%2F202243940</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". Vizier Online Data Catalog. 2237. Bibcode:2002yCat.2237....0D. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. <a href="https://doi.org/10.1051%2F0004-6361%2F202243940" target="_blank">https://doi.org/10.1051%2F0004-6361%2F202243940</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> <li id="fn:21"><p>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 href="/wiki/Anthony_Brown_(scientist)" target="_blank">/wiki/Anthony_Brown_(scientist)</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></p></li> <li id="fn:22"><p>Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></p></li> <li id="fn:23"><p>Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></p></li> <li id="fn:24"><p>Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. <a href="https://doi.org/10.1051%2F0004-6361%2F202243940" target="_blank">https://doi.org/10.1051%2F0004-6361%2F202243940</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></p></li> <li id="fn:25"><p>Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></p></li> <li id="fn:26"><p>Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></p></li> <li id="fn:27"><p>Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. <a href="https://doi.org/10.1051%2F0004-6361%2F202243940" target="_blank">https://doi.org/10.1051%2F0004-6361%2F202243940</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></p></li> <li id="fn:28"><p>Merle, T. (December 2017). "The Gaia -ESO Survey: double-, triple-, and quadruple-line spectroscopic binary candidates". Astronomy & Astrophysics. 608: A95. arXiv:1707.01720. Bibcode:2017A&A...608A..95M. doi:10.1051/0004-6361/201730442. S2CID 119502806. <a href="https://doi.org/10.1051%2F0004-6361%2F201730442" target="_blank">https://doi.org/10.1051%2F0004-6361%2F201730442</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></p></li> <li id="fn:29"><p>Platais, I.; Melo, C.; Mermilliod, J.-C.; Kozhurina-Platais, V.; Fulbright, J. P.; Méndez, R. A.; Altmann, M.; Sperauskas, J. (January 2007). "WIYN open cluster study: XXVI. Improved kinematic membership and spectroscopy of IC 2391". Astronomy & Astrophysics. 461 (2): 509–522. arXiv:astro-ph/0611584. Bibcode:2007A&A...461..509P. doi:10.1051/0004-6361:20065756. 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Bibcode:2000A&A...355L..27H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></p></li> <li id="fn:32"><p>Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H. <a href="/wiki/Bibcode_(identifier)" target="_blank">/wiki/Bibcode_(identifier)</a> <a href="#fnref:32" class="footnote-back-ref">↩</a></p></li> <li id="fn:33"><p>Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR. <a href="https://doi.org/10.1051%2F0004-6361%2F202243940" target="_blank">https://doi.org/10.1051%2F0004-6361%2F202243940</a> <a href="#fnref:33" class="footnote-back-ref">↩</a></p></li> <li id="fn:34"><p>Stauffer, J.R.; et al. 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