Lambda Aquarii

Source: Wikipedia, the free encyclopedia.
Lambda Aquarii
Location of λ Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 52m 36.87723s[1]
Declination −07° 34′ 46.5830″[1]
Apparent magnitude (V) 3.722[2] (3.57 to 3.80)[3]
Characteristics
Evolutionary stage AGB[4]
Spectral type M2.5 IIIa Fe–1[5]
U−B color index +1.721[2]
B−V color index +1.641[2]
Variable type Lb[3]
Distance
365 ± 10 ly
(112 ± 3 pc)
Absolute magnitude (MV)−1.5[8]
Details
dex
HR 8698, SAO 146362[10]
Database references
SIMBADdata

Lambda Aquarii, informally known as Hydor (

lunar occultations.[14][15] The star is eclipsed by the sun from about 1-4 March;[16] thus the star can be viewed the whole night, crossing the sky, in early September, in the current epoch. Lambda Aquarii is located at a distance of approximately 310 light-years (95 pc) from the Sun based on parallax,[1] but is drifting closer with a radial velocity of −10.5 km/s.[6]

A visual band light curve for Lambda Aquarii, plotted from data published by Tabur et al. (2009).[17] The inset plot shows the same data folded with a period of 24.5 days, after a linear trend had been removed.

The

luminosity of the Sun from the photosphere at an effective temperature of 3,835 K.[9]

Naming

Hydor is from Greek Ὕδωρ "water", a name given by

Richard Hinckley Allen. Another Greek name for the star is Ekkhysis, from εκχυσις "outpouring".[12]

In

29 Piscium, 33 Piscium and 30 Piscium.[18] Consequently, λ Aquarii itself is 壘壁陣七 (Lěi Bì Zhèn qī, English: the Seventh Star of Line of Ramparts.)[19]

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    Bibcode:1966PDAUC...1....1G
    .
  3. ^
    S2CID 125853869
    . Retrieved 2019-11-23.
  4. ^
    doi:10.1553/cia152s178
    .
  5. ^
    S2CID 14878976
    .
  6. ^
    S2CID 18739721
    .
  7. doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  8. ^
    S2CID 14481140
    .
  9. ^
    S2CID 119362842
    . Isotopic abundances of Carbon and Oxygen in Oxygen-rich giant stars.
  10. ^ "* lam Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-01.
  11. ^ Kaler, James B. "Hydor". STARS. Retrieved 2017-08-17.
  12. ^
    Allen, Richard Hinckey. "Star Names: Their Lore and Meaning"
    . Retrieved 2017-08-17.
  13. ^ John Pratt's stars re-publication by Dr J.P. Pratt (Doctor of Astronomy, University of Arizona) of sidereal coordinate data. Note: possibly a non-book published source.
  14. S2CID 120313180
    . 10.
  15. doi:10.1086/180555
    .
  16. ^ Ford, Dominic. "In-The-Sky.org Planetarium". Retrieved 2021-06-07.
  17. ^
    S2CID 15358380
    .
  18. ISBN 978-986-7332-25-7
    .
  19. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=Lambda_Aquarii&oldid=1175038326"