14 Aquarii

14 Aquarii
	; 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] At its brightest, magnitude 6.44,^[7] it could be faintly visible to the naked eye under ideal observing conditions.

In 1996 the variability of the brightness of 14 Aquarii was first detected, in the Hipparcos satellite data, resulting in the publication of its variable star designation in 1999.^[8]

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.
^ "IW Aqr". The international Variable Star Index. AAVSO. Retrieved 20 November 2024.
^ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4659: 1–27. Bibcode:1999IBVS.4659....1K. Retrieved 20 November 2024.

External links

Image HD 202466

This variable star–related article is a stub. You can help Wikipedia by expanding it.

[CDS-1] "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.

[dr3-2] ^ ^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.

[vsx-3] "14 Aqr". International Variable Star Index. AAVSO. Retrieved 2022-11-21.

[koen-4] 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.

[tycho2-5] 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.

[6] 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.

[IVSI-7] "IW Aqr". The international Variable Star Index. AAVSO. Retrieved 20 November 2024.

[Kazarovets-8] Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4659: 1–27. Bibcode:1999IBVS.4659....1K. Retrieved 20 November 2024.

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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