Eta Crateris: Difference between revisions
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{{Short description|Star in the constellation Crater}} |
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'''Eta Crateris''' (η Crt) is a 5.17 [[apparent magnitude|vmag]], A1III white [[giant star]], 251 [[light year|ly]] from Earth that marks the lip of the tilted bowl on the left side in the constellation [[Crater (constellation)|Crater]]. Eta Crateris lies in the sky NE of [[Zeta Crateris]] and NNW of [[31 Crateris]], the three stars forming an almost perfect right triangle with Eta at the right angle and 31 and Zeta the ends of the hypotenuse. Eta Crateris a;sp lies to the right (west) of the bright star [[Gamma Corvi]]. |
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{{Starbox begin |
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| name = η Crateris |
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}} |
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{{Starbox image |
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| image= |
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{{Location mark |
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|image=Crater constellation map.svg|alt=|float=center|width=240 |
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|label=|position=right |
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|mark=Red circle.svg|mark_width=10|mark_link=η Crt |
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|x=196|y=530 |
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}} |
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|caption=Location of η Crateris (circled) |
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}} |
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{{Starbox observe |
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| epoch = [[J2000.0]] |
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| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) |
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| constell = [[Crater (constellation)|Crater]] |
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| ra = {{RA|11|56|00.95323}}<ref name=vanLeeuwen2007/> |
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| dec = {{DEC|−17|09|02.9781}}<ref name=vanLeeuwen2007/> |
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| appmag_v = 5.17<ref name=Mermilliod1986/> |
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}} |
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{{Starbox character |
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| class = A0 V<ref name=Royer2007/> |
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| b-v = −0.03<ref name=Mermilliod1986/> |
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| u-b = −0.06<ref name=Mermilliod1986/> |
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| r-i = |
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| variable = |
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}} |
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{{Starbox astrometry |
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| radial_v = {{Val|+15.0|4.2}}<ref name=deBruijne2012/> |
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| prop_mo_ra = −49.74<ref name=vanLeeuwen2007/> |
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| prop_mo_dec = −7.58<ref name=vanLeeuwen2007/> |
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| parallax = 12.97 |
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| p_error = 0.23 |
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| parallax_footnote = <ref name=vanLeeuwen2007/> |
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| absmag_v = +1.00<ref name=Gontcharov2012/> |
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}} |
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{{Starbox detail |
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| source = |
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| mass = |
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| radius = 2.7<ref name=PasinettiFracassini2001/> |
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| luminosity = 48.5<ref name=Mcdonald2012/> |
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| temperature = 9,687<ref name=Mcdonald2012/> |
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| gravity = |
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| metal_fe = |
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| rotational_velocity = 65<ref name=Royer2007/> |
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| age_myr = 350<ref name=Gontcharov2012/> |
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}} |
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{{Starbox catalog |
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| names = {{odlist | B=η Crt | F=30 Crateris | BD=−16°3358 | FK5=1309 | HD=103632 | HIP=58188 | HR=4567 | SAO=156988 }}<ref name=SIMBAD/> |
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}} |
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{{Starbox reference |
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| Simbad = eta+Crt |
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}} |
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{{Starbox end}} |
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'''Eta Crateris''', [[Romanization of Greek|Latinized]] from '''η Crateris''', is a solitary<ref name=Eggleton2008/> [[star]] in the southern [[constellation]] of [[Crater (constellation)|Crater]]. It marks the lip of the tilted bowl on the left side in the constellation. Eta Crateris lies in the sky NE of [[Zeta Crateris]] and NNW of [[31 Crateris]], the three stars forming an almost perfect right triangle with Eta at the right angle and 31 and Zeta the ends of the hypotenuse. Eta Crateris also lies to the right (west) of the bright star [[Gamma Corvi]]. |
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==References== |
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This star is faintly visible to the naked eye with an [[apparent visual magnitude]] of 5.17.<ref name=Mermilliod1986/> With an annual [[stellar parallax|parallax shift]] of 12.97 [[milliarcsecond|mas]] as seen from Earth,<ref name=vanLeeuwen2007/> it is located around 280 [[light year]]s from the [[Sun]]. At that distance, the visual magnitude is diminished by an [[extinction (astronomy)|extinction factor]] of 0.08 due to [[interstellar dust]].<ref name=Gontcharov2012/> The star is receding from the Sun with a [[radial velocity]] of +15 km/s.<ref name=deBruijne2012/> |
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Eta Crateris is an ordinary [[A-type main sequence star]] with a [[stellar classification]] of A0 V.<ref name=Royer2007/> It is about 2.7<ref name=PasinettiFracassini2001/> times the radius of the [[Sun]] and radiates 48.5 times the [[solar luminosity]] from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 9,687 K.<ref name=Mcdonald2012/> It 350<ref name=Gontcharov2012/> million years old and is spinning with a [[projected rotational velocity]] of 65 km/s.<ref name=Royer2007/> |
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==References== |
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{{reflist|refs= |
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<ref name=vanLeeuwen2007>{{citation |
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| title=Validation of the new Hipparcos reduction |
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| last1=van Leeuwen | first1=F. |
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| journal=Astronomy and Astrophysics |
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| volume=474 | issue=2 | pages=653–664 | date=2007 |
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| arxiv=0708.1752 | bibcode=2007A&A...474..653V |
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| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}</ref> |
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<ref name=PasinettiFracassini2001>{{citation |
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| last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L. |
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| last3=Covino | first3=S. | last4=Pozzi | first4=A. |
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| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) |
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| journal=Astronomy and Astrophysics | display-authors=1 |
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| volume=367 | pages=521–524 | date=February 2001 | edition=3rd |
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| doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P |
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| arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}</ref> |
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<ref name=Eggleton2008>{{citation |
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| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. |
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| title=A catalogue of multiplicity among bright stellar systems |
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| journal=[[Monthly Notices of the Royal Astronomical Society]] |
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| volume=389 | issue=2 | pages=869–879 | date=September 2008 |
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| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E |
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| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref> |
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<ref name=Mcdonald2012>{{citation |
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| display-authors=1 | last1=McDonald | first1=I. |
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| last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. |
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| title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars |
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| journal=Monthly Notices of the Royal Astronomical Society |
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| volume=427 | issue=1 | pages=343–57| date=2012 |
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| bibcode=2012MNRAS.427..343M | arxiv=1208.2037 |
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| doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | s2cid=118665352 | postscript=. }}</ref> |
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<ref name=Gontcharov2012>{{citation |
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| title=Spatial distribution and kinematics of OB stars |
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| last1=Gontcharov | first1=G. A. |
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| journal=Astronomy Letters |
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| volume=38 | issue=11 | pages=694–706 | date=November 2012 |
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| doi=10.1134/S1063773712110035 | bibcode=2012AstL...38..694G |
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| arxiv=1606.09028 | s2cid=119108982 | postscript=. }}</ref> |
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<ref name=deBruijne2012>{{citation |
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| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. |
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| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project |
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| journal=Astronomy & Astrophysics |
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| volume=546 | id=A61 | pages=14 | date=October 2012 |
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| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D |
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| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}</ref> |
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<ref name=Royer2007>{{citation |
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| display-authors=1 | last1=Royer | first1=F. |
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| last2=Zorec | first2=J. | last3=Gómez | first3=A. E. |
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| title=Rotational velocities of A-type stars. III. Velocity distributions |
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| journal=Astronomy and Astrophysics |
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| volume=463 | issue=2 | pages=671–682 | date=February 2007 |
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| doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R |
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| arxiv=astro-ph/0610785 | s2cid=18475298 | postscript=. }}</ref> |
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<ref name=Mermilliod1986>{{citation |
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| last1=Mermilliod | first1=J.-C. |
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| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) |
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| journal=Catalogue of Eggen's UBV Data |
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| year=1986 | publisher=[[SIMBAD]] |
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| bibcode=1986EgUBV........0M | postscript=. }}</ref> |
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<ref name=SIMBAD>{{cite simbad |
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| title=eta Crt |
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| access-date=2017-02-26 }}</ref> |
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}} |
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{{Stars of Crater|state=collapsed}} |
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{{DEFAULTSORT:Eta Crateris}} |
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[[Category:A-type main-sequence stars]] |
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[[Category:Crater (constellation)]] |
[[Category:Crater (constellation)]] |
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[[Category:Bayer objects|Crateris, Eta]] |
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{{Star-stub}} |
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[[Category:Durchmusterung objects]] |
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[[Category:Flamsteed objects|Crateris, 30]] |
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[[Category:Henry Draper Catalogue objects|103632]] |
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[[Category:Hipparcos objects|058188]] |
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[[Category:Bright Star Catalogue objects|4567]] |
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Latest revision as of 00:09, 23 August 2024
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Crater |
| Right ascension | 11h 56m 00.95323s[1] |
| Declination | −17° 09′ 02.9781″[1] |
| Apparent magnitude (V) | 5.17[2] |
| Characteristics | |
| Spectral type | A0 V[3] |
| U−B color index | −0.06[2] |
| B−V color index | −0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | +15.0±4.2[4] km/s |
| Proper motion (μ) | RA: −49.74[1] mas/yr Dec.: −7.58[1] mas/yr |
| Parallax (π) | 12.97 ± 0.23 mas[1] |
| Distance | 251 ± 4 ly (77 ± 1 pc) |
| Absolute magnitude (MV) | +1.00[5] |
| Details | |
| Radius | 2.7[6] R☉ |
| Luminosity | 48.5[7] L☉ |
| Temperature | 9,687[7] K |
| Rotational velocity (v sin i) | 65[3] km/s |
| Age | 350[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Eta Crateris, Latinized from η Crateris, is a solitary[9] star in the southern constellation of Crater. It marks the lip of the tilted bowl on the left side in the constellation. Eta Crateris lies in the sky NE of Zeta Crateris and NNW of 31 Crateris, the three stars forming an almost perfect right triangle with Eta at the right angle and 31 and Zeta the ends of the hypotenuse. Eta Crateris also lies to the right (west) of the bright star Gamma Corvi.
This star is faintly visible to the naked eye with an apparent visual magnitude of 5.17.[2] With an annual parallax shift of 12.97 mas as seen from Earth,[1] it is located around 280 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.08 due to interstellar dust.[5] The star is receding from the Sun with a radial velocity of +15 km/s.[4]
Eta Crateris is an ordinary A-type main sequence star with a stellar classification of A0 V.[3] It is about 2.7[6] times the radius of the Sun and radiates 48.5 times the solar luminosity from its outer atmosphere at an effective temperature of 9,687 K.[7] It 350[5] million years old and is spinning with a projected rotational velocity of 65 km/s.[3]
References
[edit]- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b c d Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
- ^ a b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ a b c d Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ "eta Crt". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-02-26.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
