Alpha Cancri

{{Short description|Star system in the constellation Cancer}}

{{Starbox begin

| name = α Cancri

}}

{{Starbox image

| image =

{{Location mark

| image=Cancer constellation map.svg | alt= | float=center | width=260

| label= | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=α Cnc

| x=385|y=670

}}

| caption = α Cancri, circled, is the bottom left star in the "crab".

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Cancer

| ra = {{RA|08|58|29.2042}}

| dec = {{DEC|+11|51|27.649}}

| appmag_v = {{val|4.20|to|4.27}}{{cite web | title=NSV 4327, database entry | url=http://www.sai.msu.su/groups/cluster/gcvs/gcvs/nsv/nsv.dat | work=New Catalogue of Suspected Variable Stars, the improved version | publisher=Sternberg Astronomical Institute | location=Moscow, Russia | access-date=October 20, 2009 }}

}}

{{Starbox character

| type =

| class = kA7VmF0/2III/IVSr{{cite journal | bibcode=1991JApA...12..133S | title=MK morphological study of AM stars at 66 A/Mm | last1=Sreedhar Rao | first1=S. | last2=Abhyankar | first2=K. D. | journal=Journal of Astrophysics and Astronomy | year=1991 | volume=12 | issue=2 | page=133 | doi=10.1007/BF02709302 | s2cid=59324843 }}

| u-b = +0.15{{cite web | url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=3572 | title=HR 3572, database entry | work=The Bright Star Catalogue | edition=5th Revised (Preliminary Version) | first1=D. | last1=Hoffleit | first2=W. H. | last2=Warren, Jr. | publisher=Centre de Données astronomiques de Strasbourg | id=[http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50] | access-date=October 20, 2009 }}

| b-v = +0.14

| r-i = +0.04

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|−12.1|0.8}}{{Cite journal | doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G | title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system | journal=Astronomy Letters | volume=32 | issue=11 | pages=759–771 | year=2006 | last=Gontcharov | first=G. A. | arxiv=1606.08053 | s2cid=119231169 }}

| prop_mo_ra = 42.181

| prop_mo_dec = −31.160

| pm_footnote =

| parallax = 18.3304

| p_error = 0.3216

| parallax_footnote = {{cite Gaia EDR3|604789257076233728}}

| absmag_v = 0.46{{Cite XHIP | 44066 }}

}}

{{Starbox detail

| component1 = A

| mass = 2.10{{cite journal | bibcode=1997A&AS..124...75T | title=MSC - a catalogue of physical multiple stars | journal=Astronomy and Astrophysics Supplement Series | volume=124 | pages=75–84 | last=Tokovinin | first=A. A. | year=1997 | doi=10.1051/aas:1997181 | doi-access=free}}

| radius = 3.655{{cite journal | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Watson | first3=R. A. | date=October 2017 | title=Fundamental parameters and infrared excesses of Tycho-Gaia stars | journal=Monthly Notices of the Royal Astronomical Society | volume=471 | pages=770–791 | doi=10.1093/mnras/stx1433 | doi-access=free | issn=0035-8711| arxiv=1706.02208 | bibcode=2017MNRAS.471..770M }} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/MNRAS/471/770&RAJ2000=134.621757 Acubens' database entry] at VizieR.

| luminosity = 49

| temperature = 7,943{{cite journal | bibcode=2018AJ....155...30B | title=Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer | journal=The Astronomical Journal | volume=155 | issue=1 | pages=30 | last1=Baines | display-authors=1 | first1=Ellyn K. | last2=Armstrong | first2=J. Thomas | last3=Schmitt | first3=Henrique R. | last4=Zavala | first4=R. T. | last5=Benson | first5=James A. | last6=Hutter | first6=Donald J. | last7=Tycner | first7=Christopher | last8=Van Belle | first8=Gerard T. | year=2018 | doi=10.3847/1538-3881/aa9d8b | doi-access=free | arxiv=1712.08109 | s2cid=119427037 }}

| gravity = 3.73

| metal_fe =

| rotational_velocity = 75{{cite journal | display-authors=1 | last1=Royer | first1=F. | last2=Grenier | first2=S. | last3=Baylac | first3=M.-O. | last4=Gómez | first4=A. E. | last5=Zorec | first5=J. | title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere | journal=Astronomy and Astrophysics | year=2002 | volume=393 | issue=3 | pages=897–911 | bibcode=2002A&A...393..897R | doi=10.1051/0004-6361:20020943|arxiv = astro-ph/0205255 | s2cid=14070763 }}

| age_gyr =

| component2 = B

| mass2 = 0.38

}}

{{Starbox catalog

| names = {{odlist | name=Acubens | name2=Sertan | name3=Sartan | B=α Cnc, Alpha Cancri, Alpha Cnc | F=65 Cancri, 65 Cnc | ADS=7115 A | BD=+12 1948 | CCDM=J08585+1151A | FK5=337 | GC=12406 | HD=76756 | HIP=44066 | HR=3572 | IDS=08530+1215 A | PPM=125972 | SAO=98267 }}{{cite simbad | title=alf Cnc | access-date=2009-09-20 }}

}}

{{Starbox reference

| Simbad = alpha+cancri

| Simbad2 = ADS+7115+B|sn2=B

}}

{{Starbox end}}

Alpha Cancri is a star system in the northern constellation of Cancer. Its name is a Bayer designation that is Latinized from α Cancri, and abbreviated Alpha Cnc or α Cnc. The primary component has the proper name Acubens, pronounced {{IPAc-en|ˈ|æ|k|juː|b|ɛ|n|z}}.{{cite book | last1=Kunitzsch | first1=Paul | last2=Smart | first2=Tim | date=2006 | edition=2nd rev. | title=A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations | publisher=Sky Publishing |location=Cambridge, Massachusetts | isbn=978-1-931559-44-7 }} It forms a fourth-magnitude star with an apparent magnitude of 4.20, making it barely visible to the naked eye under good viewing conditions. Based on parallax measurements, it is located at a distance of {{convert|178|ly|pc|abbr=out|lk=on}} from the Sun, but is drifting closer with a radial velocity of −12 km/s. Since it is near the ecliptic, it can be occulted by the Moon.{{cite journal | title=First Lunar Occultation Results from the 2.4 m Thai National Telescope Equipped with ULTRASPEC | display-authors=1 | last1=Richichi | first1=A. | last2=Irawati | first2=P. | last3=Soonthornthum | first3=B. | last4=Dhillon | first4=V. S. | last5=Marsh | first5=T. R. | journal=The Astronomical Journal | volume=148 | issue=5 | id=100 | date=November 2014 | doi=10.1088/0004-6256/148/5/100 | arxiv=1408.0073 | bibcode=2014AJ....148..100R }}