1 Aquarii

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Template:Short description

1 Aquarii
Template:Location mark
Location of 1 Aqr (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.151[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type K1III[4]
U−B Template:Engvar 0.936[2]
B−V Template:Engvar 1.060[2]
Astrometry
Radial velocity (Rv)Template:Val[5] km/s
Proper motion (μ) RA: Template:Val mas/yr[1]
Dec.: Template:Val mas/yr[1]
Parallax (π)12.3852±0.1134 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)0.77[6]
Orbit[5]
Primary1 Aquarii A
Companion1 Aquarii B
Period (P)Template:Val days
Eccentricity (e)Template:Val
Periastron epoch (T)Template:Val
Argument of periastron (ω)
(secondary)		Template:Val°
Semi-amplitude (K1)
(primary)		Template:Val km/s
Details
MassTemplate:Val[7] Template:Solar mass
Radius11[8] Template:Solar radius
Luminosity53.7[8] Template:Solar luminosity
Surface gravity (log g)Template:Val[7] cgs
TemperatureTemplate:Val[9] K
Metallicity−0.12[6]
Rotational velocity (v sin i)1.8[6] km/s
Age1.26[7] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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1 Aquarii is a binary star[5] system in the zodiac constellation of Aquarius, about 263 light years away from the Sun.[1] 1 Aquarii is the Flamsteed designation. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.151,[2] located a degree north of the celestial equator.[5] The system is moving closer to the Earth with a heliocentric radial velocity of −41 km/s.[5]

Systematic observation for determining the orbit of this system began in 2002, some eighty years following the first radial velocity measurements. It is a single-lined spectroscopic binary with an orbital period of Template:Convert and an eccentricity of 0.368.[5] The visible component is an aging giant star with a stellar classification of K1III.[4] At the age of 1.26[7] billion years old it is a red clump giant, which indicates it is on the horizontal branch and is generating energy through helium fusion at its core.[3] The star has 1.5[7] times the mass of the Sun and has expanded to 11[8] times the Sun's radius. It is radiating 53.7[8] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,715 K.[9]

The mass of the companion appears small, suggesting a red dwarf no higher than class M5.[5] In addition to the spectroscopic companion there are two faint optical companions that have no physical relation to 1 Aqr.[11]

Etymology

1 Aquarii was known to the ancients as al-sa'd al-malik, or "the lucky star of the king." Interpreting the unexpressed Arabic vowels, al-sa'd al-mulk, gives an alternate translation of "the lucky star of the kingdom." In English, the name is Sadalmelik (or Sadalmelek), although rarely used today.[12][13]

References

Template:Reflist

Template:Stars of Aquarius

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Gaia DR3
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Cousins1984
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Alves2000
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Roman1952
  5. ↑ a b c d e f g Cite error: Invalid <ref> tag; no text was provided for refs named Griffin2014
  6. ↑ a b c Script error: No such module "Citation/CS1".
  7. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named Feuillet2016
  8. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Massarotti2008
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Luck2015
  10. ↑ Template:Cite simbad
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WDSC2014
  12. ↑ A Llnguist's Angle on the Star of Bethlehem — i.e. α Aquarii; Coates, Richard; Astronomy & Geophysics, Volume 49, Issue 5; (01 October 2008); Pp. 5.27–5.32; https://doi.org/10.1111/j.1468-4004.2008.49527.x
  13. ↑ Star Names; Arecibo Observatory website; mod.: Steve Gibson; accessed March 2019
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