Nu2 Arae
Star in the constellation Ara
title: "Nu2 Arae" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["b-type-giants", "b-type-subgiants", "b-type-main-sequence-stars", "ara-(constellation)", "bayer-objects", "bright-star-catalogue-objects", "durchmusterung-objects", "henry-draper-catalogue-objects", "hipparcos-objects"] description: "Star in the constellation Ara" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Nu2_Arae" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Star in the constellation Ara ::
| name = Nu2 Arae | image= |image=Ara constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=ν2 Arae |x=364|y=592 |caption=Location of ν2 Arae (circled) | epoch = J2000.0 | ra = | dec = | appmag_v = 6.10 | constell = Ara | type = Main sequence | class = B9.5 III-IV | r-i = | v-r = | b-v = +0.010 | u-b = | variable = | radial_v = | prop_mo_ra = +14.823 | prop_mo_dec = +0.415 | pm_footnote = | parallax = 5.7871 | p_error = 0.0418 | parallax_footnote = | absmag_v = +0.14 | mass = 2.4 | radius = 3.9 | luminosity = 117 | temperature = 9,586 | gravity = 3.64 | metal_fe = | rotational_velocity = | age_myr = | names= | Simbad=HIP+87379
Nu2 Arae is a star in the southern constellation of Ara. Its name is a Bayer designation that is Latinized from ν2 Arae, and abbreviated Nu2 Ara or ν2 Ara. This star is faintly visible to the naked eye with an apparent visual magnitude of 6.10. Based on parallax measurements, it is located at a distance of approximately 564 ly from the Earth. It is drifting further away from the Sun with a radial velocity of +19 km/s.
The stellar classification of B9.5 III-IV shows this to be a B-type star with a spectrum that displays features of both the subgiant and giant star stages. Stellar models predict this is a main sequence (dwarf) star with 2.4 times the mass of the Sun and 3.9 times the Sun's radius. It is radiating 117 times the luminosity of the Sun from its photosphere at an effective temperature of 9,586 K.
The star is sometimes referred as Upsilon2 Arae (υ2 Arae).
References
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|title=The TESS Input Catalog and Candidate Target List | display-authors=1 | last1=Stassun | first1=Keivan G. | last2=Oelkers | first2=Ryan J. | last3=Pepper | first3=Joshua | last4=Paegert | first4=Martin | last5=De Lee | first5=Nathan | last6=Torres | first6=Guillermo | last7=Latham | first7=David W. | last8=Charpinet | first8=Stéphane | last9=Dressing | first9=Courtney D. | last10=Huber | first10=Daniel | last11=Kane | first11=Stephen R. | last12=Lépine | first12=Sébastien | last13=Mann | first13=Andrew | last14=Muirhead | first14=Philip S. | last15=Rojas-Ayala | first15=Bárbara | last16=Silvotti | first16=Roberto | last17=Fleming | first17=Scott W. | last18=Levine | first18=Al | last19=Plavchan | first19=Peter | journal=The Astronomical Journal | date=September 2018 | volume=156 | issue=3 | pages=102 | doi=10.3847/1538-3881/aad050 | doi-access=free | issn=0004-6256 | arxiv=1706.00495 | bibcode=2018AJ....156..102S }}
References
- Note for [http://vizier.u-strasbg.fr/viz-bin/VizieR?-6N&-out.form=H0&//*&-source%3DV/50/notes&HR%3D6632 HR 6632]
- {{Cite Gaia DR3. 5945048071337531776
- (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Dept. of Astronomy, University of Michigan.
- (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of Southern Africa.
- (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters.
- "HR 6632 -- Star". [[Centre de Données astronomiques de Strasbourg]].
::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::