{{Short description|Star in the constellation Vela}} {{Starbox begin}} {{Starbox observe | epoch = J2000.0 | constell = Vela | ra = {{RA|08|55|11.782}}<ref name=GaiaDR3/> | dec = {{DEC|−54|57|56.77}}<ref name=GaiaDR3/> | appmag_v = 5.71<ref name=Johnson1966/> }} {{Starbox character | type = main sequence<ref name=GaiaDR3/> | class = F6 V<ref name=Gray2006/> | b-v = +0.48<ref name=Johnson1966/> | u-b = +0.00<ref name=Johnson1966/> | variable = }} {{Starbox astrometry | radial_v = {{Val|−5.9|0.4}}<ref name=deBruijne2012/> | prop_mo_ra = +24.398 | prop_mo_dec = −91.363 | pm_footnote = <ref name=GaiaDR3/> | parallax = 41.0816 | p_error = 0.0360 | parallax_footnote = <ref name=GaiaDR3/> | absmag_v = +3.79<ref name=vonEiff2012/> }} {{Starbox detail | mass = 1.22<ref name=Shaya2011/> | radius = {{Val|1.35|0.02}}<ref name=Fuhrmann2012/> | luminosity = 2.72<ref name=Anderson2012/> | gravity = {{Val|4.28|0.10}}<ref name=Fuhrmann2012/> | metal_fe = {{Val|−0.01|0.07}}<ref name=Fuhrmann2012/> | temperature = {{Val|6296|80|fmt=commas}}<ref name=Fuhrmann2012/> | rotational_velocity = {{Val|10.3|0.5}}<ref name=vonEiff2012/> | age_myr = {{Val|770|540}}<ref name=Pace2013/> }} {{Starbox catalog | names = {{odlist | CPD=−54°1925 | GJ=3519 | HD=76653 | HIP=43797 | HR=3570 | SAO=236405 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad=HD+76653 }} {{Starbox end}}
'''HD 76653''' is a single<ref name=Fuhrmann2012/> star in the southern constellation Vela. It is faintly visible to the naked eye with an apparent visual magnitude of +5.71.<ref name=Johnson1966/> Based upon an annual parallax shift of {{val|41.08|ul=mas}} as seen from Earth, it is located 79 light years from the Sun. The star is moving closer to the Sun with a radial velocity of −6 km/s.<ref name=deBruijne2012/> It is a probable (96% chance) co-moving companion of the nearby Delta Velorum; the two have an estimated physical separation of {{Convert|0.6605|pc|ly|order=flip|abbr=on|sigfig=2}} with similar proper motions.<ref name=Shaya2011/> Both are likely members of the Ursa Major association.<ref name=Fuhrmann2012/>
This is an F-type main-sequence star with a stellar classification of F6 V.<ref name=Gray2006/> It is larger than the Sun, with 1.22<ref name=Shaya2011/> times the mass of the Sun and 1.35<ref name=Fuhrmann2012/> times the Sun's luminosity. The star is radiating 2.72<ref name=Anderson2012/> times the Sun's luminosity from its photosphere at an effective temperature of about 6,296 K.<ref name=Fuhrmann2012/> Pace (2013) estimates HD 76653 to be 770 million years old,<ref name=Pace2013/> while Fuhrmann and Chini (2012) date it to an age of around two billion years.<ref name=Fuhrmann2012/> However, is an X-ray source with a luminosity of {{Val|214.3e27|u=erg s<sup>−1</sup>}}, which is unusually high for the older age estimate.<ref name=Fuhrmann2012/> The metallicity is near solar and it is spinning with a projected rotational velocity of 10.3 km/s.<ref name=vonEiff2012/>
HD 76653 displays an infrared excess that suggests the presence of an orbiting debris disk. This excess was detected with the Spitzer Space Telescope both by the IRS instrument at 30−34 μm and weakly by MIPS at 70 μm. The dust has a temperature of about 73−77 K and is orbiting at a mean distance of 16−18 AU from the host star.<ref name=Lawler2009/>
==References== <references>
<ref name=GaiaDR3>{{Cite Gaia DR3|5317114850417299584}}</ref>
<ref name=Anderson2012>{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | postscript=. | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | s2cid=119257644 | doi=10.1134/S1063773712050015 | arxiv=1108.4971 }}</ref>
<ref name=Fuhrmann2012>{{citation | title=Multiplicity among F-type Stars | journal=The Astrophysical Journal Supplement | volume=203 | issue=2 | pages=30 | year=2012 | last1=Fuhrmann | first1=K | last2=Chini | first2=R | bibcode=2012ApJS..203...30F | postscript=. | doi=10.1088/0067-0049/203/2/30 | doi-access=free }}</ref>
<ref name=Lawler2009>{{citation | display-authors=1 | last1=Lawler | first1=S. M. | last2=Beichma | first2=C. A. | last3=Bryden | first3=G. | last4=Ciardi | first4=D. R. | last5=Tanner | first5=A. M. | last6=Su | first6=K. Y. L. | last7=Stapelfeldt | first7=K. R. | last8=Lisse | first8=C. M. | last9=Harker | first9=D. E. | title=Explorations Beyond the Snow Line: Spitzer/IRS Spectra of Debris Disks Around Solar-type Stars | journal=The Astrophysical Journal | volume=705 | issue=1 | pages=89–111 | date=November 2009 | doi=10.1088/0004-637X/705/1/89 | bibcode=2009ApJ...705...89L | arxiv=0909.0058 | s2cid=1272803 | postscript=. }}</ref>
<ref name=Shaya2011>{{citation | last1=Shaya | first1=Ed J. | last2=Olling | first2=Rob P. | title=Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue | journal=The Astrophysical Journal Supplement | volume=192 | issue=1 | page=2 | date=January 2011 | doi=10.1088/0067-0049/192/1/2 | bibcode=2011ApJS..192....2S | arxiv=1007.0425 | s2cid=119226823 | postscript=. }}</ref>
<ref name=deBruijne2012>{{citation | 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=. }}</ref>
<ref name=Pace2013>{{citation | last1=Pace | first1=G. | title=Chromospheric activity as age indicator. An L-shaped chromospheric-activity versus age diagram | journal=Astronomy & Astrophysics | postscript=. | volume=551 | id=L8 | pages=4 | date=March 2013 | doi=10.1051/0004-6361/201220364 | bibcode=2013A&A...551L...8P | arxiv=1301.5651 | s2cid=56420519 }}</ref>
<ref name=vonEiff2012>{{citation | last1=Ammler-von Eiff | first1=Matthias | last2=Reiners | first2=Ansgar | title=New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars? | journal=Astronomy & Astrophysics | arxiv=1204.2459 | volume=542 | page=A116 | date=June 2012 | postscript=. | doi=10.1051/0004-6361/201118724 | bibcode=2012A&A...542A.116A | s2cid=53666672 }}</ref>
<ref name=Johnson1966>{{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}</ref>
<ref name=Gray2006>{{citation | display-authors=1 | last1=Gray | first1=R. O. | last2=Corbally | first2=C. J. | last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T. | last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E. | last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R. | title=Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample | journal=The Astronomical Journal | volume=132 | pages=161–170 | year=2006 | issue=1 | doi=10.1086/504637 | bibcode=2006AJ....132..161G | arxiv=astro-ph/0603770 | s2cid=119476992 | postscript=. }}</ref>
<ref name=SIMBAD>{{cite simbad | title=HD 76653 | access-date=2017-10-25 | postscript=. }}</ref>
</references>
{{Stars of Vela|state=collapsed}}
Category:F-type main-sequence stars Category:Vela (constellation) 3570 Category:Durchmusterung objects 076653 043797