25 Cancri

{{about|d² Cancri|other stars with this Bayer designation|d Cancri}}

{{Starbox begin

| name = 25 Cancri

}}

{{Starbox observe

| epoch = J2000.0

| constell = Cancer

| ra = {{RA|08|25|49.87726}}

| dec = {{DEC|+17|02|46.5717}}

| appmag_v = 6.11

}}

{{Starbox character

| type =

| class = F6 V

| b-v = {{Val|0.448|0.005}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+37.56|0.13}}

| prop_mo_ra = −191.567

| prop_mo_dec = −151.554

| parallax = 21.9803

| p_error = 0.0321

| parallax_footnote =

| absmag_v = 2.85

}}

{{Starbox detail

| source =

| component1 = 25 Cnc A

| mass = 1.51

| radius = 2.0

| luminosity = 6.60

| temperature = 6,487

| gravity = 4.01

| metal_fe = −0.10

| rotational_velocity = {{Val|37.74|0.55}}

| age_gyr = 2.50

| component2 = 25 Cnc B

| mass2 = 0.34

}}

{{Starbox catalog

| names = {{odlist | B=d² Cnc | F=25 Cnc | BD=+17°1842 | HD=71030 | HIP=41319 | HR=3299 | SAO=97806 | WDS=08258+1703 }}

}}

{{Starbox reference

| Simbad = 25+Cnc

}}

25 Cancri is a common proper motion star system in the zodiac constellation of Cancer, located around 148 light-years away from the Sun. It has the Bayer designation d² Cancri (d² Cnc); 25 Cancri (25 Cnc) is the Flamsteed designation. It is near the lower limit of visibility to the naked eye in good viewing conditions, appearing as a dim, yellow-white-hued star with a combined apparent visual magnitude of 6.11. The pair have a relatively high proper motion, traversing the celestial sphere at an angular rate of {{Val|0.245|ul=arcsecond}} per year. It is moving further from the Earth with a heliocentric radial velocity of +38 km/s.

Based upon a stellar classification of F6 V, the brighter component is an F-type main-sequence star that is generating energy through hydrogen fusion at its core. Cowley (1976) listed a class of F5 IIIm?, which suggests it may be an Am star. However, this has not been confirmed. It is about 2.5 billion years old with 1.51 times the mass of the Sun. The star is radiating 6.6 times the Sun's luminosity from its photosphere at an effective temperature of {{val|6487|ul=K|fmt=commas}}.

The companion is 4.19 magnitudes fainter than the primary, and lies at an angular separation of {{Val|16.798|ul=arcsecond}} along a position angle of 310°, as of 2013. If the pair are gravitationally bound, then they orbit each other with a period of around {{convert|1.48e9|day|Myr|disp=out|sigfig=3|abbr=off}}.

References

{{Reflist|refs=

{{citation

| title=Spectral classification of the bright F stars

| last1=Cowley | first1=A. P.

| journal=Publications of the Astronomical Society of the Pacific

| volume=88 | pages=95–110 | date=April 1976

| doi=10.1086/129905 | bibcode=1976PASP...88...95C | doi-access= }}.

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters | arxiv=1108.4971

| volume=38 | issue=5 | page=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| s2cid=119257644}}.

{{citation

| last1=Harlan | first1=E. A.

| title=MK classifications for F- and G-type stars. I

| journal=Astronomical Journal

| volume=74 | pages=916–919 | date=September 1969

| doi=10.1086/110881 | bibcode=1969AJ.....74..916H

}}.

{{citation

| last1=Lépine | first1=Sébastien | last2=Shara | first2=Michael M.

| title=A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)

| journal=The Astronomical Journal

| volume=129 | issue=3 | pages=1483–1522 | date=March 2005

| doi=10.1086/427854 | bibcode=2005AJ....129.1483L

| arxiv=astro-ph/0412070 | s2cid=2603568}}.

{{citation

| title=From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs

| journal=The Astronomical Journal

| volume=147 | issue=4 | page=87 | year=2014

| last1=Tokovinin | first1=Andrei

| doi=10.1088/0004-6256/147/4/87

| bibcode=2014AJ....147...87T | arxiv=1401.6827 | s2cid=56066740

}}.

{{citation

| last1=Casagrande | first1=L. | last2=Schönrich | first2=R.

| last3=Asplund | first3=M. | last4=Cassisi | first4=S.

| last5=Ramírez | first5=I. | last6=Meléndez | first6=J.

| last7=Bensby | first7=T. | last8=Feltzing | first8=S.

| title=New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey

| display-authors=1 | journal=Astronomy and Astrophysics

| volume=530 | page=A138 | date=June 2011

| doi=10.1051/0004-6361/201016276

| bibcode=2011A&A...530A.138C | arxiv=1103.4651 | s2cid=56118016 }}.

{{citation

| display-authors=1 | last1=Riddle | first1=Reed L.

| last2=Tokovinin | first2=Andre | last3=Mason | first3=Brian D.

| last4=Hartkopf | first4=William I. | last5=Roberts | first5=Lewis C. Jr.

| last6=Baranec | first6=Christoph | last7=Law | first7=Nicholas M.

| last8=Bui | first8=Khanh | last9=Burse | first9=Mahesh P.

| title=A Survey of the High Order Multiplicity of Nearby Solar-type Binary Stars with Robo-AO

| journal=The Astrophysical Journal