Upsilon1 Cancri

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title: "Upsilon1 Cancri" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["f-type-giants", "cancer-(constellation)", "bayer-objects", "bright-star-catalogue-objects", "durchmusterung-objects", "flamsteed-objects", "henry-draper-catalogue-objects", "hipparcos-objects"] description: "Star in the constellation Cancer" topic_path: "general/f-type-giants" source: "https://en.wikipedia.org/wiki/Upsilon1_Cancri" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Cancer ::

| name = Upsilon1 Cancri | epoch = J2000.0 | equinox = J2000.0 (ICRS) | constell = Cancer | ra = | dec = | appmag_v = +5.694 | class = F0 IIIn | b-v = +0.309 | u-b = | r-i = | variable = | radial_v = | prop_mo_ra = −80.791 | prop_mo_dec = −44.858 | pm_footnote = | parallax = 13.6180 | p_error = 0.0415 | parallax_footnote = | absmag_v = +1.29 | source = | mass = 1.47 | radius = 3.20 | luminosity = 25 | temperature = | gravity = 3.51 | metal_fe = | rotational_velocity = 109.2 | age_myr = 570 | names = | Simbad = ups01+Cnc Upsilon1 Cancri is a solitary, yellow-white-hued star in the constellation Cancer. Its name is a Bayer designation that is Latinized from υ1 Cancri, and abbreviated Upsilon1 Cnc or υ1 Cnc. This star is faintly visible to the naked eye, having an apparent visual magnitude of +5.7. Based upon an annual parallax shift of as seen from Earth, this system is 239.5 ly distant from the Sun. It is drifting further away with a line of sight velocity of +19 km/s.

This object has a stellar classification of F0 IIIn, presenting as an F-type giant star. The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation, and it shows a relatively high projected rotational velocity of 109.2 km/s. It is a variable star of unknown type that changes brightness with an amplitude of 0.05 magnitude. The star is about 570 million years old and is spinning rapidly with a projected rotational velocity of 109.2 km/s. It has an estimated mass of 1.47 times that of the Sun and 3.2 times the Sun's radius. On average, it is radiating 25 times the Sun's luminosity from its photosphere at an effective temperature of .

References

| title=On the Variability of A3-F0 Luminosity Class III-V Stars | last=Adelman | first=S. J. | journal=Information Bulletin on Variable Stars | issue=4969 | page=1 | date=October 2000 | volume=4969 | bibcode=2000IBVS.4969....1A | postscript=. }}

| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}

| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | s2cid=59451347 | postscript=. }}

| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. | title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | journal=The Astrophysical Journal | volume=804 | issue=2 | pages=146 | year=2015 | bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146 | arxiv=1501.03154 | s2cid=33401607 | postscript=. }}

| title=Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo | last1=Schröder | first1=C. | last2=Reiners | first2=Ansgar | last3=Schmitt | first3=Jürgen H. M. M. | display-authors=1 | journal=Astronomy and Astrophysics | volume=493 | issue=3 | pages=1099–1107 | date=January 2009 | doi=10.1051/0004-6361:200810377 | doi-access=free | bibcode=2009A&A...493.1099S }}

| title=The Tycho-2 catalogue of the 2.5 million brightest stars | display-authors=1 | last1=Høg | first1=E. | last2=Fabricius | first2=C. | last3=Makarov | first3=V. V. | last4=Urban | first4=S. | last5=Corbin | first5=T. | last6=Wycoff | first6=G. | last7=Bastian | first7=U. | last8=Schwekendiek | first8=P. | last9=Wicenec | first9=A. | journal=Astronomy and Astrophysics | volume=355 | pages=L27–L30 | date=March 2000 | bibcode=2000A&A...355L..27H | doi=10.1888/0333750888/2862}}

| title=ups01 Cnc | mode=cs2 | postscript=. | access-date=2017-06-10 }}

References

1. {{Cite Gaia DR3. 678464752411817344
2. {{Cite XHIP. 41816

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