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UGC 1840
UGC 1840 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Constellation	Andromeda
Right ascension	02 23 08.4268
Declination	+41° 22′ 20.031″
Redshift	0.018096
Heliocentric radial velocity	5,420 km/s
Distance	258.5 Mly (79.1 Mpc)
Characteristics
Type	Peculiar
Size	~131,100 ly (40.20 kpc) (estimated)
Notable features	Collisional ring galaxy
Other designations
IRAS 02200+4108, 2MASX J02231142+4122047, Arp 145, MCG +07-06-002, PGC 9060 & 9062, CGCG 538-056, HFLLZOA F264, V Zw 229

UGC 1840, also known as Arp 145, are a pair of interacting galaxies located 250 million light-years away from the Solar System in the Andromeda constellation. The earliest known reference to the pair of galaxies is in part 2 of the Morphological Catalogue of Galaxies, published in 1964, where it is listed as MCG +07-06-002.

Made up of two galaxies, UGC 1840 NED01 (PGC 9060) and UGC 1840 NED02 (PGC 9062), the two galaxies had recently collided with each other in which the elliptical galaxy has penetrated through the spiral galaxy's nucleus leaving a hole in its middle, thus forming a ring galaxy. With a diameter of 1.3 arc minutes, close to 100,000 thousand light-years, they are roughly the same size as the Milky Way.

Both galaxies are listed as Arp 145 in the Atlas of Peculiar Galaxies which was created by Halton Arp. They fall under the category of objects that have emanating material and both classified as galaxies that have ring systems.

References

1. ^ "Results for object NGC UGC 1840 (UGC 1840)". NASA/IPAC Extragalactic Database. California Institute of Technology. Retrieved 2024-11-13.
2. "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-04-22.
3. Vorontsov-Vel'Yaminov, B. A.; Arkhipova, V. P. (1964). "Morphological catalogue of galaxies. Part 2". Morphological Catalogue of Galaxies. C02. Bibcode:1964MCG...C02....0V.
4. "NED Search Results for UGC 1840 NED02". ned.ipac.caltech.edu. Retrieved 2024-04-22.
5. "NED Search Results for UGC 1840 NED01". ned.ipac.caltech.edu. Retrieved 2024-04-22.
6. "Collisional Ring Galaxies - P.N. Appleton & C. Struck-Marcell". ned.ipac.caltech.edu. Retrieved 2024-04-22.
7. "Mantrap Skies Astronomical Image Catalog: ARP145". images.mantrapskies.com. Retrieved 2024-04-22.
8. Chatterjee, T. K. (1984-11-01). "The Formation of Ring Galaxies". Astrophysics and Space Science. 106 (2): 309–339. Bibcode:1984Ap&SS.106..309C. doi:10.1007/BF00650358. ISSN 0004-640X.
9. Iovene, Salvatore. "UGC1840 (Arp 145) Irregular galaxy". AstroBin. Retrieved 2024-04-22.
10. "David's Astronomy - ARP Peculiar Galaxy Objects". www.astro-richweb.net. Retrieved 2024-04-22.
11. Arp, Halton (1966). "Atlas of Peculiar Galaxies". The Astrophysical Journal Supplement Series. 14: 1. Bibcode:1966ApJS...14....1A. doi:10.1086/190147.

v t e Constellation of Andromeda
Adhil Andromeda in Chinese astronomy List of Andromeda's satellite galaxies List of stars in Andromeda
Stars	Bayer α (Alpheratz) β (Mirach) γ (Almach) δ ε ζ η θ ι κ λ μ ν ξ (Adhil) ο π ρ σ τ υ (Titawin) φ χ ψ ω A b c υ Per (Nembus) Flamsteed 2 3 4 5 6 7 8 9 10 11 12 13 14 (Veritate) 15 18 22 23 26 28 32 36 39 41 44 45 47 55 56 58 59 63 64 65 66 6 Per Variable R T U W Z RT RV RX SU SW TU TW WZ XZ AB AC AD AE AF AR BM BX CC CG CN DS DX EG ET EU FF GO GP GQ GX GR GY HH HN IW KK KX KZ LL LN LP LQ OP OS OU PX PY QR QV QX V385 V428 V439 V455 V529 V807 HR 1 40 56 78 104 122 134 178 275 282 283 289 379 410 483 687 746 748 8884 8925 8950 8962 8973 9011 9074 9075 9105 HD 16175 (Buna) 222155 Other 3XMM J004232.1+411314 ADS 48 HAT-P-6 (Sterrennacht) HAT-P-16 HAT-P-19 HAT-P-28 M31-RV KELT-1 NGC 44 NGC 82 NGC 84 NGC 91 NGC 162 NGC 464 Qatar-3 Qatar-4 Qatar-5 PA-99-N2 WASP-1 WISE 0146+4234 WISE J0005+3737 WISE J004945.61+215120.0
Exoplanets 14 Andromedae b κ Andromedae b υ Andromedae b c d Gliese 15 Ab c HD 13931 b HD 16175 b HAT-P-6b HAT-P-32b WASP-1b WASP-33b Qatar-4b Qatar-5b
Star clusters	NGC 206 272 752 956 7686 Other Mayall II RBC EXT8
Nebulae	NGC 7662
Galaxies	Messier 32 110 NGC 5 11 13 19 20 21 27 39 43 48 49 51 67 68 69 70 71 72 74 76 79 80 81 83 85 86 90 93 94 96 97 108 109 112 140 149 160 169 181 183 184 214 218 226 228 229 233 243 252 258 260 262 280 304 317 389 393 404 425 431 477 512 513 523 528 529 531 536 542 561 605 620 668 679 687 700 703 704 705 708 709 710 712 714 717 721 732 753 759 801 812 834 891 906 910 911 912 913 920 937 980 995 996 999 1000 7640 7836 Numbered I II III IV V VIII IX X XI XVIII XIX XXI Other 3C 66A 3C 66B Andromeda Galaxy Arp 273 Donatiello I UGC 1840
Galaxy clusters Abell 262 NGC 68 group
Astronomical events GRB 101225A SN 1885A (S)
Category

• UGC objects
• Andromeda (constellation)
• Principal Galaxies Catalogue objects
• Ring galaxies
• Interacting galaxies
• MCG objects
• Arp objects
• Peculiar galaxies
• 2MASS objects