# 3C 287

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/3C_287
> Markdown URL: https://mediated.wiki/source/3C_287.md
> Source: https://en.wikipedia.org/wiki/3C_287
> Source revision: 1310872908
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Quasar in the constellation Coma Berenices

3C 287 The quasar 3C 287. Observation data (J2000.0 epoch) Constellation Coma Berenices Right ascension 13h 30m 37.6900s Declination +25° 09′ 10.878″ Redshift 1.055000 Heliocentric radial velocity 316,281 km/s Distance 7.733 Gly Apparent magnitude (V) 17.67 Apparent magnitude (B) 18.31 Characteristics Type CSS Other designations 4C 25.43, DA 345, NRAO 424, LEDA 2817651, LHE 347, CTA 61, QSO B1328+254

**3C 287** is a [quasar](/source/Quasar) located in the [constellation](/source/Constellation) of [Coma Berenices](/source/Coma_Berenices). It has a [redshift](/source/Redshift) of (z) 1.055,[1][2] and such classified as a prototype compact steep spectrum source (CSS).[3] This object was first discovered between January and February 1964 via a photographic [two-color](/source/Graph_coloring) technique.[4]

## Description

3C 287 is classified as radio-loud quasar with a [gigahertz](/source/Hertz) peaked [spectrum](/source/Spectrum).[1] It is found to have [continuum](/source/Continuum_mechanics) [radio emission](/source/Radio_wave) in southwest direction, likely originating from either an [M-type star](/source/Stellar_classification) or an underlying [galaxy](/source/Galaxy) that is located from the object.[5] It is a candidate precessing source, shown to have a position displacement between 2014 and 2017, likely caused by the brightening of a new component.[6][7] A bright companion can be found southwest from the object.[8]

The radio source of 3C 287 is compact with no signs of a secondary structure.[9] Based on radio mapping images made by [very long baseline interferometry](/source/Very-long-baseline_interferometry) (VLBI) and [MERLIN](/source/MERLIN), it contains several filamentary structures located both west and southwest directions, hinting the continuation of a [spiral](/source/Spiral) pattern.[10] There is a bright compact component located in the center of the source, revealed to be a small radio core whose extent is measured lower than 4 [milliarcseconds](/source/Minute_and_second_of_arc).[1][3] There is a curved [jet](/source/Astrophysical_jet). At both frequencies, the [brightness](/source/Brightness) of the source exhibits a decrease with its two-point [spectral index](/source/Spectral_index) showing a shift from 0.5 to 1.5 along a ridge line.[3][6] Radio polarimetric observations taken by [Very Long Baseline Array](/source/Very_Long_Baseline_Array) (VLBA) at sub-arcsecond resolutions, showed the source is classified as point-like. There is a much weaker extension located in the south.[11]

X-band [polarimetric](/source/Polarimetry) observations of 3C 287 captured by VLBA, found most of the [polarized](/source/Polarization_(waves)) emission originated from the brightest region. Based on results, its [magnetic field](/source/Magnetic_field) geometry is found complex exhibiting a 90° on a milliarcsecond scale.[12]

## References

1. ^ [***a***](#cite_ref-:0_1-0) [***b***](#cite_ref-:0_1-1) [***c***](#cite_ref-:0_1-2) Salvesen, G.; Miller, J. M.; Cackett, E.; Siemiginowska, A. (2009-02-10). ["A Deep XMM-Newton Observation of the Quasar 3C 287"](https://doi.org/10.1088/0004-637x/692/1/753). *The Astrophysical Journal*. **692** (1): 753–757. [arXiv](/source/ArXiv_(identifier)):[0809.4691](https://arxiv.org/abs/0809.4691). [Bibcode](/source/Bibcode_(identifier)):[2009ApJ...692..753S](https://ui.adsabs.harvard.edu/abs/2009ApJ...692..753S). [doi](/source/Doi_(identifier)):[10.1088/0004-637x/692/1/753](https://doi.org/10.1088%2F0004-637x%2F692%2F1%2F753). [ISSN](/source/ISSN_(identifier)) [0004-637X](https://search.worldcat.org/issn/0004-637X).

1. **[^](#cite_ref-2)** Lehnert, Matthew D.; Miley, George K.; Sparks, William B.; Baum, Stefi A.; Biretta, John; Golombek, Daniel; de Koff, Sigrid; Macchetto, Ferdinando D.; McCarthy, Patrick J. (August 1999). ["Hubble Space Telescope – Snapshot Survey of 3CR Quasars: The Data"](https://iopscience.iop.org/article/10.1086/313239/fulltext/). *The Astrophysical Journal Supplement Series*. **123** (2): 351–376. [Bibcode](/source/Bibcode_(identifier)):[1999ApJS..123..351L](https://ui.adsabs.harvard.edu/abs/1999ApJS..123..351L). [doi](/source/Doi_(identifier)):[10.1086/313239](https://doi.org/10.1086%2F313239). [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049).

1. ^ [***a***](#cite_ref-:1_3-0) [***b***](#cite_ref-:1_3-1) [***c***](#cite_ref-:1_3-2) Fanti, C.; Fanti, R.; Parma, P.; Venturi, T.; Schilizzi, R. T.; Nan Rendong; Spencer, R. E.; Muxlow, T. W. B.; van Breugel, W. (1989-06-01). ["Three prototype compact steep spectrum radio sources"](https://articles.adsabs.harvard.edu//full/1989A%26A...217...44F/0000044.000.html). *Astronomy and Astrophysics*. **217**: 44–56. [Bibcode](/source/Bibcode_(identifier)):[1989A&A...217...44F](https://ui.adsabs.harvard.edu/abs/1989A&A...217...44F). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-4)** Sandage, Allan; Wyndham, John D. (1965-01-01). ["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-5)** Bremer, M.N.; Crawford, C.S.; Fabian, A.C.; Johnstone, R.M. (1992). ["Extended optical emission around radio-loud quasars at Z of about 1"](https://doi.org/10.1093%2Fmnras%2F254.4.614). *Monthly Notices of the Royal Astronomical Society*. **254**: 614–626. [Bibcode](/source/Bibcode_(identifier)):[1992MNRAS.254..614B](https://ui.adsabs.harvard.edu/abs/1992MNRAS.254..614B). [doi](/source/Doi_(identifier)):[10.1093/mnras/254.4.614](https://doi.org/10.1093%2Fmnras%2F254.4.614).

1. ^ [***a***](#cite_ref-:2_6-0) [***b***](#cite_ref-:2_6-1) Paragi, Z.; Frey, S.; Sanghera, H. S. (1998-10-01). ["Is 3C 287 a precessing radio source?"](https://articles.adsabs.harvard.edu/pdf/1998A%26A...338..840P). *Astronomy and Astrophysics*. **338**: 840–842. [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-7)** Titov, Oleg; Frey, Sándor; Melnikov, Alexey; Lambert, Sébastien; Shu, Fengchun; Xia, Bo; González, Javier; Tercero, Belén; Gulayev, Sergey; Weston, Stuart; Natusch, Tim (2022-03-14). ["Unprecedented change in the position of four radio sources"](https://doi.org/10.1093%2Fmnras%2Fstac038). *Monthly Notices of the Royal Astronomical Society*. **512** (1): 874–883. [arXiv](/source/ArXiv_(identifier)):[2202.13119](https://arxiv.org/abs/2202.13119). [doi](/source/Doi_(identifier)):[10.1093/mnras/stac038](https://doi.org/10.1093%2Fmnras%2Fstac038). [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711).

1. **[^](#cite_ref-8)** Hilbert, B.; Chiaberge, M.; Kotyla, J. P.; Tremblay, G. R.; Stanghellini, C.; Sparks, W. B.; Baum, S.; Capetti, A.; Macchetto, F. D.; Miley, G. K.; O’Dea, C. P.; Perlman, E. S.; Quillen, A. (2016-07-01). ["Powerful Activity in the Bright Ages. I. A Visible/IR Survey of High Redshift 3C Radio Galaxies and Quasars"](https://doi.org/10.3847%2F0067-0049%2F225%2F1%2F12). *The Astrophysical Journal Supplement Series*. **225** (1): 12. [arXiv](/source/ArXiv_(identifier)):[1605.03196](https://arxiv.org/abs/1605.03196). [Bibcode](/source/Bibcode_(identifier)):[2016ApJS..225...12H](https://ui.adsabs.harvard.edu/abs/2016ApJS..225...12H). [doi](/source/Doi_(identifier)):[10.3847/0067-0049/225/1/12](https://doi.org/10.3847%2F0067-0049%2F225%2F1%2F12). [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049).

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/0000745.000.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)** Nan, R.; Schilizzi, R. T.; Fanti, C.; Fanti, R.; van Breugel, W. J. M.; Muxlow, T. W. (1988-01-01). ["The Radio Structures of the Compact Steep Spectrum Sources 3C119, 3C287, and 3C343"](https://articles.adsabs.harvard.edu//full/1988IAUS..129..119R/0000119.000.html). *The Impact of VLBI on Astrophysics and Geophysics; Proceedings of the 129th IAU Symposium, Cambridge, MA, May 10-15, 1987*. **129**: 119. [Bibcode](/source/Bibcode_(identifier)):[1988IAUS..129..119R](https://ui.adsabs.harvard.edu/abs/1988IAUS..129..119R).

1. **[^](#cite_ref-11)** Mantovani, F.; Rossetti, A.; Junor, W.; Saikia, D. J.; Salter, C. J. (2013-06-18). ["Radio polarimetry of compact steep spectrum sources at sub-arcsecond resolution"](https://doi.org/10.1051/0004-6361/201220769). *Astronomy & Astrophysics*. **555**: A4. [arXiv](/source/ArXiv_(identifier)):[1305.1644](https://arxiv.org/abs/1305.1644). [Bibcode](/source/Bibcode_(identifier)):[2013A&A...555A...4M](https://ui.adsabs.harvard.edu/abs/2013A&A...555A...4M). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201220769](https://doi.org/10.1051%2F0004-6361%2F201220769). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361).

1. **[^](#cite_ref-12)** Dallacasa, D.; Schilizzi, R. T.; Rendong, Nan (1998). ["X-Band VLBA Polarization of 3C 287"](https://articles.adsabs.harvard.edu//full/1998ASPC..144..117D/0000117.000.html). *International Astronomical Union Colloquium*. **164**: 117–118. [Bibcode](/source/Bibcode_(identifier)):[1998ASPC..144..117D](https://ui.adsabs.harvard.edu/abs/1998ASPC..144..117D). [doi](/source/Doi_(identifier)):[10.1017/s025292110004478x](https://doi.org/10.1017%2Fs025292110004478x). [ISSN](/source/ISSN_(identifier)) [0252-9211](https://search.worldcat.org/issn/0252-9211).

## External links

- [3C 287 on SIMBAD](http://simbad.u-strasbg.fr/simbad/sim-id?bibyear1=1850&bibyear2=%24currentYear&submit=Display&Ident=%402159761&Name=7C+132816.2%2B252436&bibdisplay=refsum&bibyear1=1850&bibyear2=%24currentYear#lab_bib)

- [3C 287 on NASA/IPAC Database](http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=63377&objname=1&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1)

v t e Constellation of Coma Berenices List of stars in Coma Berenices Coma Berenices in Chinese astronomy Stars Bayer α (Diadem) β γ Flamsteed 7 11 12 13 14 16 17 21 23 (Phyllon Kissinou) 24 31 35 36 37 41 Variable FK GP IN LW HR 4668 HD 107146 108863 108874 110067 114762 b 115404 116029 Other 2MASS J12195156+3128497 KELT-6 WASP-56 WISE 1217+1626 Exoplanets HD 108874 b c KELT-6b Star clusters Coma Star Cluster Messier 53 NGC 4147 NGC 5053 Nebulae LoTr 5 Galaxies Messier 64 (Black Eye Galaxy) 85 88 91 98 99 100 NGC 4014 4015 4017 4053 4056 4060 4061 4065 4066 4070 4072 4074 4076 4084 4086 4089 4090 4091 4092 4093 4095 4098 4136 4146 4150 4162 4185 4189 4203 4211 4212 4213 4222 4237 4245 4253 4262 4274 4278 4293 4298 4302 4308 4310 4312 4314 4323 4328 4340 4359 4375 4383 4393 4394 4414 4419 4448 4450 4455 4459 4468 4473 4474 4475 4477 4479 4489 4494 4495 4498 4502 4506 4515 4516 4523 4525 4540 4555 4556 4558 4559 4561 4565 4571 4585 4595 4611 4614 4615 4633 4634 4651 4659 4670 4673 4676 (Mice Galaxies) 4689 4692 4710 4712 4725 4747 4839 4848 4860 4869 4871 4872 4873 4874 4875 4876 4881 4883 4886 4889 4892 4895 4907 4911 4919 4921 4944 5000 5004 5012 5032 5056 5172 Other 3C 275.1 3C 287 Arp 60 Coma Berenices Dragonfly 44 IC 755 (NGC 4019) IC 831 IC 860 IC 3505 IC 3528 IC 4040 IC 4051 IOK-1 IRAS F12032+1707 LEDA 83677 M85-HCC1 Malin 1 PGC 44691 PKS 1155+251 PKS 1222+216 VIRGOHI21 ZwCl 1305.4+2941 BCG Galaxy clusters Abell 1413 Coma I Coma Cluster Coma Supercluster M94 Group NGC 4065 Group NGC 4631 Group Astronomical events GRB 050509B iPTF14atg SN 1940B SN 1979C SN 2005ap SN 2006X SN 2020oi Category

---
Adapted from the Wikipedia article [3C 287](https://en.wikipedia.org/wiki/3C_287) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/3C_287?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.