Nu Aquarii
  | |
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h09m35.64888s[1] |
| Declination | –11° 22′ 18.0851″[1] |
| Apparent magnitude(V) | 4.52[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| U−Bcolor index | +0.66[2] |
| B−Vcolor index | +0.94[2] |
| Astrometry | |
| Radial velocity(Rv) | −11.23[4]km/s |
| Proper motion(μ) | RA:+94.12[1]mas/yr Dec.:−14.62[1]mas/yr |
| Parallax(π) | 20.47 ± 0.21mas[1] |
| Distance | 159 ± 2ly (48.9 ± 0.5pc) |
| Absolute magnitude(MV) | +0.93[5] |
| Details | |
| Mass | 2.35[5]M☉ |
| Radius | 8[4]R☉ |
| Luminosity | 37[4]L☉ |
| Surface gravity(logg) | 2.8[4]cgs |
| Temperature | 4,920[4]K |
| Metallicity[Fe/H] | −0.15[4]dex |
| Rotational velocity(vsini) | 0.0[4]km/s |
| Age | 708[5]Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Nu Aquarii(ν Aqr, ν Aquarii) is theBayer designationfor astarin theequatorialconstellationofAquarius.
With anapparent visual magnitudeof 4.52,[2]Nu Aquarii is visible to the naked eye. Its distance from Earth, as determined fromparallaxmeasurements, is around 159light-years(49parsecs). At an estimated age of 708 million years,[5]it hasevolvedinto agiant starwith aspectrumthat matches astellar classificationof G8 III.[3]It has than double themass of the Sun[5]and has expanded to eight[4]times theSun's radius.Nu Aquarii is radiating 37-fold[4]theluminosity of the Sunfrom itsouter atmosphereat aneffective temperatureof4,920K.[4]At this heat, the star is glowing with the yellowish hue of aG-type star.[7]
Together withμ Aquarii,it isAlbulaan/ˌælbjəˈlɑːn/,a name derived from theArabictermal-bulaʽān(ألبولعان), meaning "the two swallowers". This star, along withε Aqr(Albali) andμ Aqr(Albulaan), wereal Bulaʽ(البلع)—the Swallower.[8][9]
InChinese,Thiên lũy thành(Tiān Lěi Chéng), meaningCelestial Ramparts,refers to an asterism consisting of ν Aquarii,ξ Aquarii,46 Capricorni,47 Capricorni,λ Capricorni,50 Capricorni,18 Aquarii,29 Capricorni,9 Aquarii,8 Aquarii,14 Aquarii,17 Aquariiand19 Aquarii.[10]Consequently, theChinese namefor ν Aquarii itself isThiên lũy thành thập(Tiān Lěi Chéng shí,English:the Tenth Star of Celestial Ramparts).[11]
References[edit]
- ^abcdevan Leeuwen, F. (November 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,S2CID18759600.
- ^abcdJohnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars",Communications of the Lunar and Planetary Laboratory,4(99): 99,Bibcode:1966CoLPL...4...99J.
- ^abBuscombe, W. (1962), "Spectral classification of Southern fundamental stars",Mount Stromlo Observatory Mimeogram,4:1,Bibcode:1962MtSOM...4....1B.
- ^abcdefghijMassarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity",The Astronomical Journal,135(1): 209–231,Bibcode:2008AJ....135..209M,doi:10.1088/0004-6256/135/1/209.
- ^abcdeTakeda, Yoichi; Sato, Bun'ei; Murata, Daisuke (August 2008), "Stellar parameters and elemental abundances of late-G giants",Publications of the Astronomical Society of Japan,60(4): 781–802,arXiv:0805.2434,Bibcode:2008PASJ...60..781T,doi:10.1093/pasj/60.4.781,S2CID16258166.
- ^"nu. Aqr".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2012-07-02.
- ^"The Colour of Stars",Australia Telescope, Outreach and Education,Commonwealth Scientific and Industrial Research Organisation,December 21, 2004, archived fromthe originalon December 3, 2013,retrieved2012-07-02.
- ^Davis Jr., G. A. (October 1944), "The Pronunciations, Derivations, and Meanings of a Selected List of Star Names",Popular Astronomy,52(3): 12,Bibcode:1944PA.....52....8D.
- ^Allen, R. H.(1963),Star Names: Their Lore and Meaning(Reprint ed.), New York: Dover Publications Inc, p.53,ISBN0-486-21079-0,retrieved2010-12-12.
- ^(in Chinese)Trung quốc tinh tọa thần thoại,written by trần cửu kim. Published by đài loan thư phòng xuất bản hữu hạn công tư, 2005,ISBN978-986-7332-25-7.
- ^(in Chinese)AEEA (Activities of Exhibition and Education in Astronomy) thiên văn giáo dục tư tấn võng 2006 niên 5 nguyệt 15 nhật
