| 释义 |
- References
{{Starbox begin
| name = 70 Cancri
}}{{Starbox observe
| epoch = J2000.0
| constell = Cancer
| ra = {{RA|09|04|09.86704}}[1]
| dec = {{DEC|+27|53|53.9089}}[1]
| appmag_v = 6.665[3]
}}{{Starbox character
| type = main sequence
| class = A1V[4]
| b-v = +0.00[5]
| u-b = +0.05[5]
| variable =
}}{{Starbox astrometry
| radial_v = {{Val|-21.0|4.4}}[7]
| prop_mo_ra = −1.287[1]
| prop_mo_dec = −1.429[1]
| parallax = 5.6109
| p_error = 0.1390
| parallax_footnote = [1]
| absmag_v = 0.24[11]
}}{{Starbox detail
| source =
| mass =
| radius = 2.7[12]
| luminosity = 75.57[11]
| temperature = {{Val|8887|352|376|fmt=commas}}[1]
| gravity =
| metal_fe =
| rotational_velocity =
| age_gyr =
}}{{Starbox catalog
| names = {{odlist | F=70 Cnc | BD=+28°1683 | HD=77557 | HIP=44512 | HR=3601 | SAO=80609 }}
}}{{Starbox reference
| Simbad = 70+Cnc
}}{{Starbox end}}70 Cancri is a star in the zodiac constellation of Cancer, located around 580 light years from the Sun.[1] It is a challenge to view with the naked eye even under good seeing conditions, having an apparent visual magnitude of 6.7.[3] The star is moving closer to the Earth with a heliocentric radial velocity of -21 km/s,[7] and is expected to come to within {{Convert|13.48|pc|ly|0|abbr=off|disp=out}} in around nine million years.[11] It is an A-type main-sequence star[4] with a stellar classification of A1V.[4] The object has a radius of about {{solar radius|2.7}}[12] and is radiating 76[11] times the Sun's luminosity from its photosphere at an effective temperature of 8,887 K.[1]References1. ^1 2 3 4 5 6 7 8 {{Cite Gaia DR2|692366599475454592}}
2. ^1 2 3 4 {{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 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | postscript=. }}
3. ^1 2 {{cite journal|display-authors=1|author1=Pasinetti Fracassini, L. E.|author2=Pastori, L.|author3=Covino, S.|author4=Pozzi, A.|title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics|journal=Astronomy & Astrophysics|volume=367|pages=521–24|date=2001|bibcode=2001A&A...367..521P|doi=10.1051/0004-6361:20000451|arxiv=astro-ph/0012289}}
4. ^1 2 {{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}
5. ^1 2 3 {{cite journal|title=A study of the bright A stars. I. A catalogue of spectral classifications|author1=Cowley, A.|author2=Cowley, C.|author3=Jaschek, M.|author4=Jaschek, C.|journal=Astronomical Journal|volume=74|pages=375–406|date=1969|bibcode=1969AJ.....74..375C|doi=10.1086/110819}}
6. ^1 2 {{cite journal|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|author=Gontcharov, G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053}}
7. ^1 2 {{cite journal|title=Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of A0 V Stars|author=Osawa, Kiyoteru|journal=Astrophysical Journal|volume=130|page=159|date=1959|bibcode=1959ApJ...130..159O|doi=10.1086/146706}}
}}{{Stars of Cancer}} 7 : A-type main-sequence stars|Cancer (constellation)|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |