14 Aquarii

HD 202466
	; A light curve for IW Aquarii, plotted from Hipparcos data
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	21h 16m 17.7734s
Declination	−09° 12′ 52.795″
Apparent magnitude (V)	6.44 - 6.55
Characteristics
Spectral type	M4III:
B−V color index	1.57
Variable type	Semiregular
Astrometry
Radial velocity (Rv)	8.00 km/s
Proper motion (μ)	RA: −1.597 mas/yr ; Dec.: +3.549 mas/yr
Parallax (π)	2.4622 ± 0.0685 mas
Distance	1,320 ± 40 ly ; (410 ± 10 pc)
Absolute magnitude (MV)	−2.3
Details
Mass	1.9 M☉
Radius	106 R☉
Luminosity	2,145 L☉
Surface gravity (log g)	+0.36 cgs
Temperature	3,542 K
Metallicity [Fe/H]	−0.4 dex
Age	1.5 Gyr
Other designations
	IW Aquariii, BD−09°5700, HD 202466, HIP 105019, SAO 145251.
Database references
SIMBAD	data

14 Aquarii (abbreviated 14 Aqr) is red giant star. 14 Aquarii is the Flamsteed designation; it also bears the variable star designation IW Aquarii. It is a semiregular variable with an amplitude of a tenth of a magnitude, and shows variations on a timescale of just one day.^[4]

References

^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
^ ^a ^b ^c ^d ^e ^f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ "14 Aqr". International Variable Star Index. AAVSO. Retrieved 2022-11-21.
^ ^a ^b ^c ^d Koen, Chris; Laney, Dave (2000). "Rapidly oscillating M giant stars?". Monthly Notices of the Royal Astronomical Society. 311 (3): 636. Bibcode:2000MNRAS.311..636K. doi:10.1046/j.1365-8711.2000.03127.x.
^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
^ Kharchenko, N. V.; Scholz, R.-D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.

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Observation data Epoch J2000 Equinox J2000
A light curve for IW Aquarii, plotted from Hipparcos data^[1]
Constellation	Aquarius
Right ascension	21^h 16^m 17.7734^s^[2]
Declination	−09° 12′ 52.795″^[2]
Apparent magnitude (V)	6.44 - 6.55^[3]
Characteristics
Spectral type	M4III:^[4]
B−V color index	1.57^[5]
Variable type	Semiregular^[4]
Astrometry

Radial velocity (R_v)	8.00^[6] km/s
Proper motion (μ)	RA: −1.597^[2] mas/yr Dec.: +3.549^[2] mas/yr
Parallax (π)	2.4622 ± 0.0685 mas^[2]
Distance	1,320 ± 40 ly (410 ± 10 pc)
Absolute magnitude (M_V)	−2.3^[4]

Details^[2]

Mass	1.9 `M`_☉
Radius	106 `R`_☉
Luminosity	2,145 `L`_☉
Surface gravity (log g)	+0.36 cgs
Temperature	3,542 K
Metallicity [Fe/H]	−0.4 dex
Age	1.5 Gyr

Other designations
IW Aquariii, BD−09°5700, HD 202466, HIP 105019, SAO 145251.
Database references
SIMBAD	data