11 Aquarii

11 Aquarii is a sun-like star in the zodiac constellation of Aquarius, located 88.5 light years away from the Sun. 11 Aquarii is the Flamsteed designation. It is difficult to see with the naked eye, appearing as a dim, yellow-hued star with an apparent visual magnitude of 6.22.^[2] This body is moving closer to the Earth with a heliocentric radial velocity of −17.8 km/s,^[2] and is expected to come as close as 65.1 ly in 700,000 years.^[6]

11 Aquarii

Observation data Epoch J2000      Equinox J2000
Constellation	Aquarius
Right ascension	21h 00m 33.84082s[1]
Declination	–04° 43′ 48.9421″[1]
Apparent magnitude (V)	6.216[2]
Characteristics
Spectral type	G1 V[3]
U−B color index	+0.22[4]
B−V color index	+0.63[4]
Astrometry
Radial velocity (Rv)	−17.8±2[2] km/s
Proper motion (μ)	RA: 48.856 mas/yr Dec.: –137.781 mas/yr
Parallax (π)	36.8541 ± 0.0570 mas[1]
Distance	88.5 ± 0.1 ly (27.13 ± 0.04 pc)
Absolute magnitude (MV)	4.10[2]
Details
Mass	1.12+0.03 −0.09[2] M☉
Radius	1.30[5] R☉
Luminosity	2.24[6] L☉
Surface gravity (log g)	4.39[7] cgs
Temperature	5,973[7] K
Metallicity [Fe/H]	0.11[2]–0.28[7] dex
Rotational velocity (v sin i)	5[8] km/s
Age	4.7[2] Gyr
Other designations
10 Aqr, BD−05°5433, HD 199960, HIP 103682, HR 8041, SAO 145022[9]
Database references
SIMBAD	data

It is a G-type main-sequence star with a stellar classification of G1 V.^[3] Compared to the Sun, this star has a higher abundance of elements more massive than helium. This indicates it belongs to a class of stars called metal-rich. The star is slightly older than the Sun, but it has slightly more mass and has a larger radius.^[2][5] It is radiating 2.24^[6] times the luminosity of the Sun from its photosphere at an effective temperature of 5,973 K.^[7]

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418 (3): 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959, S2CID 11027621
3. Buscombe, W. (1962), "Spectral classification of Southern fundamental stars", Mount Stromlo Observatory Mimeogram, 4: 1, Bibcode:1962MtSOM...4....1B
4. Cousins, A. W. J. (1964), "Photometric Data for Stars in the Equatorial Zone (Seventh List)", Monthly Notes of the Astronomical Society of Southern Africa, 23: 175, Bibcode:1964MNSSA..23..175C
5. Takeda, Genya; et al. (February 2007), "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog", The Astrophysical Journal Supplement Series, 168 (2): 297–318, arXiv:astro-ph/0607235, Bibcode:2007ApJS..168..297T, doi:10.1086/509763, S2CID 18775378
6. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
7. Sousa, S. G.; et al. (August 2007), "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program. Stellar [Fe/H] and the frequency of exo-Neptunes", Astronomy and Astrophysics, 487 (1): 373–381, arXiv:0805.4826, Bibcode:2008A&A...487..373S, doi:10.1051/0004-6361:200809698, S2CID 18173201
8. Takeda, Yoichi; et al. (February 2005), "High-Dispersion Spectra Collection of Nearby F--K Stars at Okayama Astrophysical Observatory: A Basis for Spectroscopic Abundance Standards", Publications of the Astronomical Society of Japan, 57 (1): 13–25, Bibcode:2005PASJ...57...13T, doi:10.1093/pasj/57.1.13
9. "10 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 27, 2019.

External links

• "Simbad query". Retrieved September 28, 2009.
• "TCAEP". Archived from the original on April 21, 2013. Retrieved September 28, 2009.
• "11 Aqr, Space Geody". Retrieved September 28, 2009.
• "G stars within 100 light-years". Retrieved September 28, 2009.
• "Nearby Stars Online Spectra". Archived from the original on July 17, 2011. Retrieved September 28, 2009.