# 3C 380

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Quasar in the constellation Draco

3C 380 The quasar 3C 380. Observation data (J2000.0 epoch) Constellation Draco Right ascension 18h 29m 31.7809s Declination +48° 44′ 46.161″ Redshift 0.6920000 Heliocentric radial velocity 207,456 km/s Distance 6.074 Gly Apparent magnitude (V) 16.81 Apparent magnitude (B) 17.05 Characteristics Type Opt. var, Sy 1.5, LPQ Other designations CTA 79, NRAO 565, LEDA 2817708, QSO B1828+4842, 4C +48.46, S4 1828+487, WK 396, WMAP 46,

**3C 380** is a radio-loud [quasar](/source/Quasar) located in the [constellation](/source/Constellation) of [Draco](/source/Draco_(constellation)).[1][2] First discovered in 1965 and identified with a starlike object,[3][4] it is one of the luminous and powerful [radio sources](/source/Astronomical_radio_source) in [Third Cambridge Catalogue](/source/Third_Cambridge_Catalogue_of_Radio_Sources), with a [redshift](/source/Redshift) of (z) 0.692 and a compact steep spectrum (CSS) source.[5][6][7]

## Description

3C 380 contains a complex radio structure. Radio images produced by the [very long baseline interferometry](/source/Very-long-baseline_interferometry) (VLBI) at 5 [GHz](/source/Hertz), showed the source is mainly extended, containing several components including a compact radio core and a ridge of extended [radio emission](/source/Radio_wave).[8][9] In additional, the quasar also has a diffused halo with a [spectral index](/source/Spectral_index) of 1.0 ± 0.2 which represents a common feature of the radio lobes in [Fanaroff-Riley class](/source/Fanaroff%E2%80%93Riley_classification) II quasars.[6] An extended [radio lobe](/source/Radio_lobe) was also discovered in 3C 380, having a low spectral index when compared to those at [decimeter](/source/Decimetre) [wavelengths](/source/Wavelength).[10] There are also two hotpots located in northwest direction.[11]

The [radio jet](/source/Astrophysical_jet) of 3C 380 on parsec-scales is known to be bent. Based on VLBI observations, it is shown to be resolved when travelling in a [transverse direction](/source/Polar_coordinate_system), however it also shows signs of rapid [brightness](/source/Brightness_temperature) variations unlike other nuclear jets indicating phase effects play a role in causing these changes. Apart from that, the jet shows [superluminal motion](/source/Superluminal_motion)[12] and a [Faraday rotation](/source/Faraday_effect) gradient measuring 70-200 [parsecs](/source/Parsec) in width across it.[13] Radio imaging [Very Long Baseline Array](/source/Very_Long_Baseline_Array) (VLBA) also finds the jet is extending in a northwest direction.[14]

According to [Hubble Space Telescope](/source/Hubble_Space_Telescope) (HST) and VLBA, the jet has two knots. These knots are respectively named as knot 1, located 0.73 [arcseconds](/source/Minute_and_second_of_arc) from the core and knot 2 which is located 0.4 arcseconds away from the former. Together, these knots are found laid over lobelike emission which in turn, is stretched out in both east and northeast directions.[15]

Multifrequency [polarization](/source/Polarization_(waves)) have also been found in 3C 380. Based on observations, both the core and jet contains polarization by 6 [percent](/source/Percentage), while the other component has 16 percent polarization.[16] Enhanced [flux](/source/Flux) density at 24 GHz from the object was also detected in September 2020.[17]

## References

1. **[^](#cite_ref-1)** Gulati, Sanna; Bhattacharya, Debbijoy; Sreekumar, P. (November 2024). ["Constraining the Location of the γ-Ray Emission Region in Radio-loud AGN 3C 380"](https://doi.org/10.3847%2F1538-4357%2Fad891e). *The Astrophysical Journal*. **977** (1): 9. [Bibcode](/source/Bibcode_(identifier)):[2024ApJ...977....9G](https://ui.adsabs.harvard.edu/abs/2024ApJ...977....9G). [doi](/source/Doi_(identifier)):[10.3847/1538-4357/ad891e](https://doi.org/10.3847%2F1538-4357%2Fad891e). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-2)** Koyama, Shoko; Kino, Motoki; Nagai, Hiroshi; Hada, Kazuhiro; Kameno, Seiji; Kobayashi, Hideyuki (2013-04-25). ["VLBI Imagings of a Kilo-Parsec Knot in 3C 380"](https://academic.oup.com/pasj/article/65/2/29/1551196). *Publications of the Astronomical Society of Japan*. **65** (2): 29. [arXiv](/source/ArXiv_(identifier)):[1211.6124](https://arxiv.org/abs/1211.6124). [doi](/source/Doi_(identifier)):[10.1093/pasj/65.2.29](https://doi.org/10.1093%2Fpasj%2F65.2.29). [ISSN](/source/ISSN_(identifier)) [0004-6264](https://search.worldcat.org/issn/0004-6264).

1. **[^](#cite_ref-3)** Sandage, Allan; Wyndham, John D. (January 1965). ["On the Optical Identification of Eleven New Quasi-Stellar Radio Sources"](https://articles.adsabs.harvard.edu/pdf/1965ApJ...141..328S). *The Astrophysical Journal*. **141**: 328. [Bibcode](/source/Bibcode_(identifier)):[1965ApJ...141..328S](https://ui.adsabs.harvard.edu/abs/1965ApJ...141..328S). [doi](/source/Doi_(identifier)):[10.1086/148125](https://doi.org/10.1086%2F148125). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-4)** Burbidge, E. Margaret (1965-11-01). ["Redshifts of the Quasi-Stellar Radio Sources 3c 334, 3c 345, 3c 380, and a Discussion of the Possible Redshift of 3c 446"](https://articles.adsabs.harvard.edu/pdf/1965ApJ...142.1674B). *The Astrophysical Journal*. **142**: 1674. [Bibcode](/source/Bibcode_(identifier)):[1965ApJ...142.1674B](https://ui.adsabs.harvard.edu/abs/1965ApJ...142.1674B). [doi](/source/Doi_(identifier)):[10.1086/148459](https://doi.org/10.1086%2F148459). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-5)** Taylor, Gregory B. (1998-10-20). ["Magnetic Fields in Quasar Cores"](https://iopscience.iop.org/article/10.1086/306286/fulltext/). *The Astrophysical Journal*. **506** (2): 637–646. [Bibcode](/source/Bibcode_(identifier)):[1998ApJ...506..637T](https://ui.adsabs.harvard.edu/abs/1998ApJ...506..637T). [doi](/source/Doi_(identifier)):[10.1086/306286](https://doi.org/10.1086%2F306286). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. ^ [***a***](#cite_ref-:0_6-0) [***b***](#cite_ref-:0_6-1) Wilkinson, P. N.; Akujor, Chidi E.; Cornwell, T. J.; Saikia, D. J. (1991-01-01). ["3C 380 : a powerful radio source seen end-on ?"](https://articles.adsabs.harvard.edu/pdf/1991MNRAS.248...86W). *Monthly Notices of the Royal Astronomical Society*. **248**: 86–90. [doi](/source/Doi_(identifier)):[10.1093/mnras/248.1.86](https://doi.org/10.1093%2Fmnras%2F248.1.86). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711).

1. **[^](#cite_ref-7)** Kameno, Seiji; Inoue, Makoto; Fujisawa, Kenta; Shen, Zhi-Qiang; Wajima, Kiyoaki (2000-12-01). ["First-Epoch VSOP Observation of 3C 380: Kinematics of the Parsec-Scale Jet"](https://articles.adsabs.harvard.edu/pdf/2000PASJ...52.1045K). *Publications of the Astronomical Society of Japan*. **52** (6): 1045–L1053. [doi](/source/Doi_(identifier)):[10.1093/pasj/52.6.1045](https://doi.org/10.1093%2Fpasj%2F52.6.1045). [ISSN](/source/ISSN_(identifier)) [0004-6264](https://search.worldcat.org/issn/0004-6264).

1. **[^](#cite_ref-8)** Pearson, T. J.; Readhead, A. C. S. (May 1988). ["The milliarcsecond structure of a complete sample of radio sources. II - First-epoch maps at 5 GHz"](https://articles.adsabs.harvard.edu//full/1988ApJ...328..114P/0000139.000.html). *The Astrophysical Journal*. **328**: 114. [Bibcode](/source/Bibcode_(identifier)):[1988ApJ...328..114P](https://ui.adsabs.harvard.edu/abs/1988ApJ...328..114P). [doi](/source/Doi_(identifier)):[10.1086/166274](https://doi.org/10.1086%2F166274). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-9)** Pearson, T. J.; Readhead, A. C. S.; Perley, R. A. (May 1985). ["Compact radio sources in the 3C catalog"](https://articles.adsabs.harvard.edu//full/1985AJ.....90..738P/0000751.000.html). *The Astronomical Journal*. **90**: 738. [Bibcode](/source/Bibcode_(identifier)):[1985AJ.....90..738P](https://ui.adsabs.harvard.edu/abs/1985AJ.....90..738P). [doi](/source/Doi_(identifier)):[10.1086/113782](https://doi.org/10.1086%2F113782). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. **[^](#cite_ref-10)** Megn, A. V.; Rashkovskiĭ, S. L.; Shepelev, V. A.; Inyutin, G. A.; Brazhenko, A. I.; Bulatsen, V. G.; Vashchishin, R. V.; Koshevoĭ, V. V.; Lozinskiĭ, A. B.; Kassim, N. E. (2006-09-01). ["Extended component in the quasar 3C 380"](https://ui.adsabs.harvard.edu/abs/2006ARep...50..692M/abstract). *Astronomy Reports*. **50** (9): 692–698. [Bibcode](/source/Bibcode_(identifier)):[2006ARep...50..692M](https://ui.adsabs.harvard.edu/abs/2006ARep...50..692M). [doi](/source/Doi_(identifier)):[10.1134/S1063772906090022](https://doi.org/10.1134%2FS1063772906090022). [ISSN](/source/ISSN_(identifier)) [1063-7729](https://search.worldcat.org/issn/1063-7729).

1. **[^](#cite_ref-11)** de Vries, W. H.; O'Dea, C. P.; Baum, S. A.; Sparks, W. B.; Biretta, J.; de Koff, S.; Golombek, D.; Lehnert, M. D.; Macchetto, F.; McCarthy, P.; Miley, G. K. (June 1997). ["*Hubble Space Telescope* Imaging of Compact Steep Spectrum Radio Sources"](https://iopscience.iop.org/article/10.1086/313001/fulltext/). *The Astrophysical Journal Supplement Series*. **110** (2): 191–211. [Bibcode](/source/Bibcode_(identifier)):[1997ApJS..110..191D](https://ui.adsabs.harvard.edu/abs/1997ApJS..110..191D). [doi](/source/Doi_(identifier)):[10.1086/313001](https://doi.org/10.1086%2F313001). [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049).

1. **[^](#cite_ref-12)** Polatidis, A. G.; Wilkinson, P. N. (1998-02-21). ["Superluminal motion in the parsec-scale jet in 3C 380"](https://academic.oup.com/mnras/article/294/2/327/1101469). *Monthly Notices of the Royal Astronomical Society*. **294** (2): 327–337. [doi](/source/Doi_(identifier)):[10.1111/j.1365-8711.1998.01246.x](https://doi.org/10.1111%2Fj.1365-8711.1998.01246.x). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711).

1. **[^](#cite_ref-13)** Gabuzda, D. C.; Cantwell, T. M.; Cawthorne, T. V. (2014-02-01). ["Magnetic field structure of the extended 3C 380 jet"](https://doi.org/10.1093%2Fmnrasl%2Fslt129). *Monthly Notices of the Royal Astronomical Society*. **438** (1): L1–L5. [Bibcode](/source/Bibcode_(identifier)):[2014MNRAS.438L...1G](https://ui.adsabs.harvard.edu/abs/2014MNRAS.438L...1G). [doi](/source/Doi_(identifier)):[10.1093/mnrasl/slt129](https://doi.org/10.1093%2Fmnrasl%2Fslt129). [hdl](/source/Hdl_(identifier)):[10468/4956](https://hdl.handle.net/10468%2F4956). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711).

1. **[^](#cite_ref-14)** Zensus, J. A.; Ros, E.; Kellermann, K. I.; Cohen, M. H.; Vermeulen, R. C.; Kadler, M. (August 2002). ["Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. II. Additional Sources"](https://iopscience.iop.org/article/10.1086/341585/fulltext/). *The Astronomical Journal*. **124** (2): 662–674. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0205076](https://arxiv.org/abs/astro-ph/0205076). [Bibcode](/source/Bibcode_(identifier)):[2002AJ....124..662Z](https://ui.adsabs.harvard.edu/abs/2002AJ....124..662Z). [doi](/source/Doi_(identifier)):[10.1086/341585](https://doi.org/10.1086%2F341585). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. **[^](#cite_ref-15)** O'Dea, Christopher P.; de Vries, Willem; Biretta, John A.; Baum, Stefi A. (March 1999). ["Hubble Space Telescope and VLA Observations of Two Optical Continuum Knots in the Jet of 3C 380"](https://doi.org/10.1086/300758). *The Astronomical Journal*. **117** (3): 1143–1150. [Bibcode](/source/Bibcode_(identifier)):[1999AJ....117.1143O](https://ui.adsabs.harvard.edu/abs/1999AJ....117.1143O). [doi](/source/Doi_(identifier)):[10.1086/300758](https://doi.org/10.1086%2F300758). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. **[^](#cite_ref-16)** Ludke, E.; Garrington, S. T.; Spencer, R. E.; Akujor, C. E.; Muxlow, T. W. B.; Sanghera, H. S.; Fanti, C. (1998-09-01). ["MERLIN polarization observations of compact steep-spectrum sources at 5 GHz"](https://articles.adsabs.harvard.edu/pdf/1998MNRAS.299..467L). *Monthly Notices of the Royal Astronomical Society*. **299** (2): 467–478. [Bibcode](/source/Bibcode_(identifier)):[1998MNRAS.299..467L](https://ui.adsabs.harvard.edu/abs/1998MNRAS.299..467L). [doi](/source/Doi_(identifier)):[10.1046/j.1365-8711.1998.01843.x](https://doi.org/10.1046%2Fj.1365-8711.1998.01843.x). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711).

1. **[^](#cite_ref-17)** Marchili, N.; Righini, S.; Giroletti, M.; Egron, E.; Perrodin, D.; Grandi, P.; Torresi, E. (2020-09-01). ["Enhanced 24 GHz flux density from 3C 380"](https://ui.adsabs.harvard.edu/abs/2020ATel14012....1M/abstract). *The Astronomer's Telegram*. **14012**: 1. [Bibcode](/source/Bibcode_(identifier)):[2020ATel14012....1M](https://ui.adsabs.harvard.edu/abs/2020ATel14012....1M).

## External links

- [3C 380 on SIMBAD](http://simbad.u-strasbg.fr/simbad/sim-id?Ident=ICRF%20J182931.7%2B484446)

- [3C 380 on NASA/IPAC Database](http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=64252&objname=1&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1)

v t e Constellation of Draco List of stars in Draco Draco in Chinese astronomy Stars Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ1 (Dziban) ψ2 ω Flamsteed 4 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 50 59 64 (e) 68 Variable TW YY AG BY CL CM CX DO EK HP V581 HR 3751 4126 4934 5811 6237 6518 6618 (Alruba) 6817 7137 7783 HD 109246 (Funi) 101364 128717 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 KOI-256 LP 71-82 Qatar-1 SDSS J1240+6710 Struve 2398 TOI-1136 WD 1856+534 WISE 1647+5632 WISE 1841+7000 Exoplanets HD 139357 b HD 167042 b ι Dra b (Hypatia) Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i Kepler-296b c d e f TOI-1452 b TrES-2b Star clusters LAMOST 1 Nebulae Cat's Eye Nebula NGC 6742 Galaxies NGC 3147 3197 3735 4121 4125 4221 4236 4319 4331 4332 4363 4441 4513 4545 4589 5678 5777 5866 5866B 5879 5905 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6505 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 343 3C 343.1 3C 351 3C 356 3C 371 3C 380 3C 390.3 3C 401 4C +72.26 4C 73.08 8C 1241+735 Abell 2218 BCG Bean galaxy Beaver galaxy BZQ J1727+5510 Draco Dwarf Draco II GB 1508+5714 Goldfish galaxy H1821+643 HFLS3 IERS B1946+708 IRAS F17179+5444 IRAS 18580+6527 J120011.1+680924.8 KKR 25 Markarian 817 Markarian 876 Original TRG PGC 39058 Porphyrion QSO B1823+568 RGZ J172749.5+534647 S5 1803+784 S5 2007+777 SDSS J1715+6008 Tadpole Galaxy UGC 9391 UGC 9405 UGC 11241 UGC 11411 WISEA J145223.62+611707.5 WN B1851+5707 Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster NGC 5866 Group Astronomical events SN 2003jb SN 2005B SN 2016aps Swift J1644+57 Category

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Adapted from the Wikipedia article [3C 380](https://en.wikipedia.org/wiki/3C_380) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/3C_380?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.