# LQ Hydrae

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Star in the constellation Hydra

LQ Hydrae A visual band light curve for LQ Hydrae. The main plot (adapted from Berdyugina et al.[1]) shows the long-term variation, and the inset plot (adapted from Kiraga[2]) shows the periodic variation. Observation data Epoch J2000.0 Equinox J2000.0 Constellation Hydra[3] Right ascension 09h 32m 25.568s[4] Declination −11° 11′ 04.69″[4] Apparent magnitude (V) 7.79 to 7.86[5] Characteristics Evolutionary stage Main sequence Spectral type K1Vp[6] B−V color index 0.933±0.021[3] Variable type BY Dra[5] Astrometry Radial velocity (Rv) 7.58±0.27[7] km/s Proper motion (μ) RA: −248.040 mas/yr[4] Dec.: 34.277 mas/yr[4] Parallax (π) 54.7362±0.0244 mas[4] Distance 59.59 ± 0.03 ly (18.269 ± 0.008 pc) Absolute magnitude (MV) 6.47[6] Details Mass 0.81[8] M☉ Radius 1.0[9] R☉ Luminosity 0.282±0.001[4] L☉ Surface gravity (log g) 4.57[8] cgs Temperature 4,812±39[8] K Metallicity [Fe/H] 0.32[8] dex Rotation 1.601[9] d Rotational velocity (v sin i) 25±2[10] km/s Age Under 75[11] Myr Other designations LQ Hya, BD−10 2857, GC 13168, GJ 355, HD 82558, HIP 46816, SAO 155272, LTT 3510[12] Database references SIMBAD data

**LQ Hydrae** is a single[13] [variable star](/source/Variable_star) in the [equatorial](/source/Celestial_equator) [constellation](/source/Constellation) of [Hydra](/source/Hydra_(constellation)). It is sometimes identified as **Gl 355** from the [Gliese Catalogue](/source/Gliese_Catalogue_of_Nearby_Stars); *LQ Hydrae* is the [variable star designation](/source/Variable_star_designation), which is abbreviated LQ Hya.[14] The brightness of the star ranges from an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 7.79 down to 7.86,[5] which is too faint to be readily visible to the naked eye. Based on [parallax](/source/Stellar_parallax) measurements, this star is located at a distance of 59.6 [light years](/source/Light_year) from the [Sun](/source/Sun). It is drifting further away with a [radial velocity](/source/Radial_velocity) of 7.6 km/s.[7]

During a 1981 survey of southern stars, [W. P. Bidelman](/source/William_P._Bidelman) found the [H and K lines](/source/H_and_K_lines) of ionized calcium for LQ Hya were filled in with [emission](/source/Emission-line). ([W. D. Heintz](/source/Wulff-Dieter_Heintz) independently made the same observation.) In 1986, [F. C. Fekel](https://en.wikipedia.org/w/index.php?title=Francis_C._Fekel&action=edit&redlink=1) and associates determined this is a young, rapidly rotating [BY Draconis-type variable](/source/BY_Draconis_variable).[13][15] A decade of photometry was used to determine a [rotation period](/source/Rotation_period) of 1.601136±0.000013 days (1 day, 14 hours, and 24 minutes) The [star spots](/source/Star_spot) on the surface showed significant evolution over time scales of a few months. Variations in rotational modulation of surface activity suggested the star is undergoing [differential rotation](/source/Differential_rotation).[10]

The high [lithium](/source/Lithium) abundance and rapid rotation of this star indicate it is a [zero age main sequence](/source/Zero_age_main_sequence) star, or possibly even a [pre-main sequence star](/source/Pre-main_sequence_star).[14] A strong [flare](/source/Flare_star) event was observed on December 22, 1993, with an estimated energy release of ~5.7×1033 erg.[11] Additional flares were detected thereafter, with [ROSAT](/source/ROSAT) [X-ray](/source/Astrophysical_X-ray_source) data from 1992 showing a strong flare during that time period.[14] Observations from December 2000 and 2001 showed that the [magnetic field](/source/Stellar_magnetic_field) of the star is dramatically changing its topology on a time frame of a year or less.[16]

The [stellar classification](/source/Stellar_classification) of LQ Hya is K1Vp,[6] indicating it is a [K-type main-sequence star](/source/K-type_main-sequence_star) with some peculiar features in the spectrum. In some respects it is considered an [analog of a young Sun](/source/Solar_analog) around the age of 60 million years.[1] It shows strong emission of ultraviolet and has been detected in the X-ray band, showing an X-ray emission of 8.8×1029 erg/s and indicating high chromospheric activity levels.[14] The star shows dual magnetic activity cycles with period of 6.8 and 11.4 years,[14] which are somewhat comparable to the [solar cycle](/source/Solar_cycle) in the Sun.

## References

1. ^ [***a***](#cite_ref-Berdyugina_et_al_2002_1-0) [***b***](#cite_ref-Berdyugina_et_al_2002_1-1) Berdyugina, S. V.; et al. (November 2002), "Magnetic activity in the young solar analog LQ Hydrae. I. Active longitudes and cycles", *Astronomy and Astrophysics*, **394** (2): 505–515, [Bibcode](/source/Bibcode_(identifier)):[2002A&A...394..505B](https://ui.adsabs.harvard.edu/abs/2002A&A...394..505B), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20021179](https://doi.org/10.1051%2F0004-6361%3A20021179).

1. **[^](#cite_ref-Kiraga_2-0)** Kiraga, M. (March 2012). ["ASAS Photometry of ROSAT Sources. I. Periodic Variable Stars Coincident with Bright Sources from the ROSAT All Sky Survey"](http://acta.astrouw.edu.pl/Vol62/n1/pdf/pap_62_1_4.pdf) (PDF). *Acta Astronomica*. **62** (1): 67–95. [arXiv](/source/ArXiv_(identifier)):[1204.3825](https://arxiv.org/abs/1204.3825). [Bibcode](/source/Bibcode_(identifier)):[2012AcA....62...67K](https://ui.adsabs.harvard.edu/abs/2012AcA....62...67K). Retrieved 23 June 2022.

1. ^ [***a***](#cite_ref-Anderson_Francis_2012_3-0) [***b***](#cite_ref-Anderson_Francis_2012_3-1) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *[Astronomy Letters](/source/Astronomy_Letters)*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015). [XHIP record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ681510a8389ecb&-out.src=V%2F137D%2FXHIP&-nav=cat%3AV%2F137D%26tab%3A{V%2F137D%2FXHIP}%26key%3Asource%3DV%2F137D%2FXHIP%26HTTPPRM%3A&-source=V%2F137D%2FXHIP&-out=HIP&HIP=46816&-out=Comp&-out=Gr&-out=RAJ2000&-out=DEJ2000&-out=Dist&-out=X&-out=Y&-out=Z&-out=SpType&-out=Simbad&-out=Hpmag&-out=Lum&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-GaiaDR3_4-0) [***b***](#cite_ref-GaiaDR3_4-1) [***c***](#cite_ref-GaiaDR3_4-2) [***d***](#cite_ref-GaiaDR3_4-3) [***e***](#cite_ref-GaiaDR3_4-4) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D5739942011185493888%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Samus_et_al_2017_5-0) [***b***](#cite_ref-Samus_et_al_2017_5-1) [***c***](#cite_ref-Samus_et_al_2017_5-2) Samus', N. N; et al. (2017), "General catalogue of variable stars", *Astronomy Reports*, GCVS 5.1, **61** (1): 80, [Bibcode](/source/Bibcode_(identifier)):[2017ARep...61...80S](https://ui.adsabs.harvard.edu/abs/2017ARep...61...80S), [doi](/source/Doi_(identifier)):[10.1134/S1063772917010085](https://doi.org/10.1134%2FS1063772917010085), [S2CID](/source/S2CID_(identifier)) [125853869](https://api.semanticscholar.org/CorpusID:125853869).

1. ^ [***a***](#cite_ref-Houk_Swift_1999_6-0) [***b***](#cite_ref-Houk_Swift_1999_6-1) [***c***](#cite_ref-Houk_Swift_1999_6-2) Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", *Michigan Spectral Survey*, **5**, [Bibcode](/source/Bibcode_(identifier)):[1999MSS...C05....0H](https://ui.adsabs.harvard.edu/abs/1999MSS...C05....0H).

1. ^ [***a***](#cite_ref-Halbwachs_et_al_2018_7-0) [***b***](#cite_ref-Halbwachs_et_al_2018_7-1) Halbwachs, J. -L.; et al. (2018), "Multiplicity among solar-type stars. IV. The CORAVEL radial velocities and the spectroscopic orbits of nearby K dwarfs", *Astronomy and Astrophysics*, **619**: A81, [arXiv](/source/ArXiv_(identifier)):[1808.04605](https://arxiv.org/abs/1808.04605), [Bibcode](/source/Bibcode_(identifier)):[2018A&A...619A..81H](https://ui.adsabs.harvard.edu/abs/2018A&A...619A..81H), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833377](https://doi.org/10.1051%2F0004-6361%2F201833377), [S2CID](/source/S2CID_(identifier)) [119437322](https://api.semanticscholar.org/CorpusID:119437322).

1. ^ [***a***](#cite_ref-Luck2018_8-0) [***b***](#cite_ref-Luck2018_8-1) [***c***](#cite_ref-Luck2018_8-2) [***d***](#cite_ref-Luck2018_8-3) Luck, R. Earle (March 2018), "Abundances in the Local Region. III. Southern F, G, and K Dwarfs", *The Astronomical Journal*, **155** (3): 31, [Bibcode](/source/Bibcode_(identifier)):[2018AJ....155..111L](https://ui.adsabs.harvard.edu/abs/2018AJ....155..111L), [doi](/source/Doi_(identifier)):[10.3847/1538-3881/aaa9b5](https://doi.org/10.3847%2F1538-3881%2Faaa9b5), [S2CID](/source/S2CID_(identifier)) [125765376](https://api.semanticscholar.org/CorpusID:125765376), 111.

1. ^ [***a***](#cite_ref-Strassmeier2009_9-0) [***b***](#cite_ref-Strassmeier2009_9-1) Strassmeier, Klaus G. (September 2009), "Starspots", *The Astronomy and Astrophysics Review*, **17** (3): 251–308, [Bibcode](/source/Bibcode_(identifier)):[2009A&ARv..17..251S](https://ui.adsabs.harvard.edu/abs/2009A&ARv..17..251S), [doi](/source/Doi_(identifier)):[10.1007/s00159-009-0020-6](https://doi.org/10.1007%2Fs00159-009-0020-6).

1. ^ [***a***](#cite_ref-Jetsu1993_10-0) [***b***](#cite_ref-Jetsu1993_10-1) Jetsu, L. (September 1993), "A decade of photometry of LQ Hydrae", *Astronomy and Astrophysics*, **276**: 345–352, [Bibcode](/source/Bibcode_(identifier)):[1993A&A...276..345J](https://ui.adsabs.harvard.edu/abs/1993A&A...276..345J).

1. ^ [***a***](#cite_ref-Montes_et_al_1999_11-0) [***b***](#cite_ref-Montes_et_al_1999_11-1) Montes, D.; et al. (May 1999), "Optical and ultraviolet observations of a strong flare in the young, single K2 dwarf LQ Hya", *Monthly Notices of the Royal Astronomical Society*, **305** (1): 45–60, [arXiv](/source/ArXiv_(identifier)):[astro-ph/9811452](https://arxiv.org/abs/astro-ph/9811452), [Bibcode](/source/Bibcode_(identifier)):[1999MNRAS.305...45M](https://ui.adsabs.harvard.edu/abs/1999MNRAS.305...45M), [doi](/source/Doi_(identifier)):[10.1046/j.1365-8711.1999.02373.x](https://doi.org/10.1046%2Fj.1365-8711.1999.02373.x), [S2CID](/source/S2CID_(identifier)) [10033733](https://api.semanticscholar.org/CorpusID:10033733).

1. **[^](#cite_ref-SIMBAD_12-0)** ["LQ Hya"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=LQ+Hya), *[SIMBAD](/source/SIMBAD)*, [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg), retrieved 2022-02-23.

1. ^ [***a***](#cite_ref-Fekel_et_al_1986b_13-0) [***b***](#cite_ref-Fekel_et_al_1986b_13-1) Fekel, F. C.; et al. (November 1986), "Chromospherically active stars. II. HD 82558, a young single BY Draconis variable", *Astronomical Journal*, **92**: 1150–1154, [Bibcode](/source/Bibcode_(identifier)):[1986AJ.....92.1150F](https://ui.adsabs.harvard.edu/abs/1986AJ.....92.1150F), [doi](/source/Doi_(identifier)):[10.1086/114246](https://doi.org/10.1086%2F114246).

1. ^ [***a***](#cite_ref-Covino_et_al_2001_14-0) [***b***](#cite_ref-Covino_et_al_2001_14-1) [***c***](#cite_ref-Covino_et_al_2001_14-2) [***d***](#cite_ref-Covino_et_al_2001_14-3) [***e***](#cite_ref-Covino_et_al_2001_14-4) Covino, S.; et al. (June 2001), "Quiescent and flare analysis for the chromospherically active star Gl 355 (LQ Hya)", *Astronomy and Astrophysics*, **371** (3): 973–985, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0103473](https://arxiv.org/abs/astro-ph/0103473), [Bibcode](/source/Bibcode_(identifier)):[2001A&A...371..973C](https://ui.adsabs.harvard.edu/abs/2001A&A...371..973C), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20010454](https://doi.org/10.1051%2F0004-6361%3A20010454), [S2CID](/source/S2CID_(identifier)) [119518367](https://api.semanticscholar.org/CorpusID:119518367).

1. **[^](#cite_ref-Fekel_et_al_1986a_15-0)** Fekel, F. C.; et al. (February 1986), "A Survey of Chromospherically Active Stars", *Astrophysical Journal Supplement*, **60**: 551, [Bibcode](/source/Bibcode_(identifier)):[1986ApJS...60..551F](https://ui.adsabs.harvard.edu/abs/1986ApJS...60..551F), [doi](/source/Doi_(identifier)):[10.1086/191097](https://doi.org/10.1086%2F191097).

1. **[^](#cite_ref-McIfor_et_al_2004_16-0)** McIvor, T.; et al. (December 2004), "The changing corona of LQ Hya", *Monthly Notices of the Royal Astronomical Society*, **355** (4): 1066–1072, [Bibcode](/source/Bibcode_(identifier)):[2004MNRAS.355.1066M](https://ui.adsabs.harvard.edu/abs/2004MNRAS.355.1066M), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2004.08391.x](https://doi.org/10.1111%2Fj.1365-2966.2004.08391.x), [S2CID](/source/S2CID_(identifier)) [120518212](https://api.semanticscholar.org/CorpusID:120518212).

## Further reading

- Cole-Kodikara, Elizabeth M.; et al. (September 2019), "Spot evolution on LQ Hya from 2006-2017: temperature maps based on SOFIN and FIES data", *Astronomy & Astrophysics*, **629**: 9, [arXiv](/source/ArXiv_(identifier)):[1904.08713](https://arxiv.org/abs/1904.08713), [Bibcode](/source/Bibcode_(identifier)):[2019A&A...629A.120C](https://ui.adsabs.harvard.edu/abs/2019A&A...629A.120C), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201935729](https://doi.org/10.1051%2F0004-6361%2F201935729), [S2CID](/source/S2CID_(identifier)) [121348666](https://api.semanticscholar.org/CorpusID:121348666), A120.

- Cole, E. M.; et al. (September 2015), "Doppler imaging of LQ Hydrae for 1998-2002", *Astronomy & Astrophysics*, **581**: 9, [arXiv](/source/ArXiv_(identifier)):[1504.03673](https://arxiv.org/abs/1504.03673), [Bibcode](/source/Bibcode_(identifier)):[2015A&A...581A..69C](https://ui.adsabs.harvard.edu/abs/2015A&A...581A..69C), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201425440](https://doi.org/10.1051%2F0004-6361%2F201425440), [S2CID](/source/S2CID_(identifier)) [118155166](https://api.semanticscholar.org/CorpusID:118155166), A69.

- Zhang, Liyun; et al. (October 2014), "Chromospheric activity on late-type star LQ Hya", *New Astronomy*, **32**: 1–5, [Bibcode](/source/Bibcode_(identifier)):[2014NewA...32....1Z](https://ui.adsabs.harvard.edu/abs/2014NewA...32....1Z), [doi](/source/Doi_(identifier)):[10.1016/j.newast.2014.02.010](https://doi.org/10.1016%2Fj.newast.2014.02.010).

- Cao, Dong-tao; et al. (February 2014), "Chromospheric Activity and Rotational Modulation on the Young, Single K2 Dwarf LQ Hya", *The Astronomical Journal*, **147** (2): 10, [Bibcode](/source/Bibcode_(identifier)):[2014AJ....147...38C](https://ui.adsabs.harvard.edu/abs/2014AJ....147...38C), [doi](/source/Doi_(identifier)):[10.1088/0004-6256/147/2/38](https://doi.org/10.1088%2F0004-6256%2F147%2F2%2F38), [S2CID](/source/S2CID_(identifier)) [120310890](https://api.semanticscholar.org/CorpusID:120310890), 38.

- Kõvári, Zs.; Weber, M. (June 2004), Forgács-Dajka, E.; Petrovay, K.; Erdélyi, R. (eds.), "Differential rotation of LQ Hya and IL Hya from Doppler imaging", *Proceedings of the British-Hungarian N+N Workshop for Young Researchers On Computer processing and use of satellite data in astronomy and astrophysics and 3rd Workshop of Young Researchers in Astronomy & Astrophysics; Hungary, 3-7 February 2004*, vol. 14, Publications of the Astronomy Department of the Eötvös University (PADEU), pp. 221–232, [Bibcode](/source/Bibcode_(identifier)):[2004PADEU..14..221K](https://ui.adsabs.harvard.edu/abs/2004PADEU..14..221K).

- Livshits, M. A.; Alekseev, I. Yu.; Katsova, M. M. (July 2003), "Butterfly Diagram for Starspots on LQ Hya", *Astronomy Reports*, **47** (7): 562–572, [Bibcode](/source/Bibcode_(identifier)):[2003ARep...47..562L](https://ui.adsabs.harvard.edu/abs/2003ARep...47..562L), [doi](/source/Doi_(identifier)):[10.1134/1.1592835](https://doi.org/10.1134%2F1.1592835), [S2CID](/source/S2CID_(identifier)) [122361382](https://api.semanticscholar.org/CorpusID:122361382).

- Alekseev, I. Yu.; Kozlova, O. V. (January 2003), "Spots and Active Regions on Emission Stars. III. LQ Hya", *Astrophysics (English Translation of Astrofizika)*, **46** (1): 28–45, [Bibcode](/source/Bibcode_(identifier)):[2003Ap.....46...28A](https://ui.adsabs.harvard.edu/abs/2003Ap.....46...28A), [doi](/source/Doi_(identifier)):[10.1023/A:1022959419060](https://doi.org/10.1023%2FA%3A1022959419060), [S2CID](/source/S2CID_(identifier)) [116908588](https://api.semanticscholar.org/CorpusID:116908588).

- Donati, J. -F. (January 1999), "Magnetic cycles of HR 1099 and LQ Hydrae", *Monthly Notices of the Royal Astronomical Society*, **302** (3): 457–481, [Bibcode](/source/Bibcode_(identifier)):[1999MNRAS.302..457D](https://ui.adsabs.harvard.edu/abs/1999MNRAS.302..457D), [doi](/source/Doi_(identifier)):[10.1046/j.1365-8711.1999.02096.x](https://doi.org/10.1046%2Fj.1365-8711.1999.02096.x).

- Saar, S. H.; et al. (1994), Caillault, J.-P. (ed.), "Multiple Epoch Magnetic Surface Images of LQ Hya", *The Eighth Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun*, Astronomical Society of the Pacific Conference Series, vol. 64, pp. 661–663, [Bibcode](/source/Bibcode_(identifier)):[1994ASPC...64..661S](https://ui.adsabs.harvard.edu/abs/1994ASPC...64..661S).

- Strassmeier, K. G.; et al. (February 1993), "Surface features of the lower atmosphere of HD 82558 (=LQ Hydrae)", *Astronomy and Astrophysics*, **268**: 671–684, [Bibcode](/source/Bibcode_(identifier)):[1993A&A...268..671S](https://ui.adsabs.harvard.edu/abs/1993A&A...268..671S).

- Saar, S. H.; et al. (1992), Giampapa, M. S.; Bookbinder, J. A. (eds.), "Magnetic Surface Images of the BY DRA Star HD 82558", *The Seventh Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun*, Astronomical Society of the Pacific Conference Series, vol. 26, pp. 255–258, [Bibcode](/source/Bibcode_(identifier)):[1992ASPC...26..255S](https://ui.adsabs.harvard.edu/abs/1992ASPC...26..255S).

v t e Constellation of Hydra List of stars in Hydra Hydra in Chinese astronomy Stars Bayer α (Alphard) β γ (Naga) δ ε (Ashlesha) ζ η θ ι (Ukdah) κ λ μ ν ξ ο π ρ σ (Minchir) τ1 τ2 υ1 (Zhang) υ2 φ1 φ2 φ3 χ1 χ2 ψ ω b1 b3 C F Flamsteed 1 2 3 6 (a) 9 10 12 (D) 14 15 17 19 20 21 23 24 25 26 27 (P) 28 29 33 (A) 34 37 44 47 48 50 51 (k) 52 (l) 54 (m) 55 56 57 58 (Solitaire) 59 60 10 Crt 17 Crt 20 Crt 2 Sex Variable R U V W TW EX HS KU LQ V361 V419 V421 V478 V484 HR 3378 3538 3749 (G) 3750 3858 (I) 3862 3919 3923 (Felis) 4162 4328 4339 (β Ant) 4445 5265 HD 72659 74156 82943 86226 86264 90156 (γ Ant) Other 2MASS 1114−2618 ESO 439-26 Gliese 328 Gliese 357 Gliese 433 Gliese 453 GJ 3634 HAT-P-30 HE 1256−2738 HE 1327−2326 LHS 2065 LHS 3003 LTT 3780 SDSS J090745.0+024507 WASP-25 WASP-36 WASP-84 WASP-166 (Filetdor) WISE 0855−0714 WISEA J1141−3326 Exoplanets Gliese 357 d HD 72659 b HD 74156 b c HD 82943 b c HD 86226 b HD 86264 b TW Hydrae b (unconfirmed) WASP-193b Star clusters Messier 48 Messier 68 NGC 5694 Price-Whelan 1 Nebulae Abell 33 Abell 35 NGC 3242 Southern Owl Nebula Galaxies Messier 83 NGC 2617 2642 2697 2708 2758 2835 2848 2865 2890 2935 2936 2937 2960 2962 2986 2992 3030 3052 3054 3081 3109 3124 3200 3285 3285B 3290 3305 3307 3308 3309 3311 3312 3313 3314 3315 3316 3336 3369 3383 3393 3402 3463 3464 3585 3621 3673 3717 3904 3923 3936 4980 4993 5042 5061 5078 5085 5101 5135 5260 5264 5495 5626 Other 3C 196.1 AM 1316−241 Arp 7 CTQ 327 ESO 510-G13 GAMA202627 GLEAM J0917−0012 Hydra A IC 535 MRC 1138−262 Peekaboo Galaxy PKS 1151−348 RX J0911.4+0551 SDSS J0841+0101 TN J0924−2201 Tololo 1247−232 ZwCl 1693 BCG Galaxy clusters Abell 754 Abell 3411 Abell 3412 Bullet Group Hickson 40 Astronomical events GW170817 Category

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Adapted from the Wikipedia article [LQ Hydrae](https://en.wikipedia.org/wiki/LQ_Hydrae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/LQ_Hydrae?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.