3C 20

3C 20

Observation data (J2000 epoch)
Constellation	Cassiopeia
Right ascension	00^h 43^m 08.84^s^[1]
Declination	+52° 03′ 33.8″^[1]
Redshift	0.174
Distance	~ 700 Mpc
Apparent magnitude (V)	19^[2]
Characteristics
Type	E^[1]
Apparent size (V)	76.8 × 76.8 arcsec²^[3] (radiogalaxy)
Other designations
DA 22, LEDA 2817481, 3C 20

3C 20 is a radio galaxy^[4] located in the constellation Cassiopeia. It is one of largest known galaxies with a diameter of 850,000 ly (260 kpc).^[a] The galaxy features a prominent double hotspot in its eastern lobe. An unusually low fraction of the flux lies within the radio core, which is suggested to be caused by a combination of factors, including jet orientation, synchrotron self-absorption and aging, as well as interactions with surrounding gas and dust.^[5]

References

^ ^a ^b ^c "NASA/IPAC Extragalactic Database". Results for QSO B1637+826. Retrieved 2006-10-26.
^ Simbad
^ www.jb.man.ac.uk/atlas/
^ Hiltner, P. R.; Meisenheimer, K.; Roeser, H. J.; Laing, R. A.; Perley, R. A. (1994). "Hot SPOT 3C20 west: an optical synchrotron source". Astronomy and Astrophysics. 286: 25–36. Bibcode:1994A&A...286...25H.
^ Hardcastle, M. J.; Alexander, P.; Pooley, G. G.; Riley, J. M. (1997-07-11). "High-resolution observations at 3.6 cm of seventeen FR II radio galaxies with 0.15". Monthly Notices of the Royal Astronomical Society. 288 (4): 859–890. doi:10.1093/mnras/288.4.859. ISSN 0035-8711.

Notes

^ Calculated from apparent size and distance: $700Mpc*sin(76.8arcsec)=850,000ly$

Constellation of Cassiopeia

Stars

Bayer	α (Schedar) β (Caph) γ (Navi/Tsih) δ (Ruchbah) ε (Segin) ζ (Fulu) η (Achird) θ (Marfak) ι κ λ μ ν ξ ο π ρ σ τ υ¹ υ² (Castula) φ χ ψ ω
Flamsteed	1 2 4 6 9 10 12 42 47 48 (A) 49 50 54
Variable	R S TZ WZ YZ (21) AO AR PZ V373 V509 V547 V669 V705 V762 V863 V773 V987 V1022 V1405
HR	5 91 144 196 244 273 297 743 932 8832 8853 8881
HD	861 7924 7977 15558 17156 (Nushagak) 240210 240237 240429 240430
Other	BD+60°2522 Gliese 49 IRAS 23304+6147 LS I +61 303 PSR J0205+6449 Tycho G 4U 0142+61 WR 2 WR 3

Exoplanets	HD 7924 b HD 17156 b HD 219134 b c d e (h) f g HD 240210 b HD 240237 b

Star clusters	Messier 52 Messier 103 NGC 103 NGC 110 NGC 129 NGC 133 NGC 136 NGC 146 NGC 189 NGC 225 NGC 358 NGC 366 NGC 381 NGC 433 NGC 436 NGC 457 NGC 559 NGC 637 NGC 654 NGC 659 NGC 663 NGC 1027 NGC 7789 NGC 7790 Trumpler 3

Nebulae

NGC	281 7635
Other	3C 58 Cassiopeia A Heart Nebula IC 289 IC 1805 KjPn 8 LBN 114.55+00.22 Sh 2-185 Westerhout 5

Galaxies

NGC	147 185 278
Other	Andromeda VII 3C 20 3C 35 Dwingeloo 1 Dwingeloo 2 MB 3 IC 10 Maffei 1 Maffei 2 QSO B0153+744

Astronomical events	SN 1181 SN 1572 (B)

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