| Object: NGC 4490/85 - ARP 269 |
Date: May 21-22-23, 2023 - Location: Davis Mountains west of Fort Davis, TX
Telescope: 10 inch RC - Mount: Paramount MX - Camera: Apogee Alta F8300M
Exposure: Lum. = 34 x 5 min., Bin 1x1 - Red, Green, Blue, Ha = 24x5 min. each, Bin 2x2
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NGC 4490/85 - ARP 269
NGC 4490, commonly known as the Cocoon Galaxy, lies in the constellation Canes Venatici at a distance of approximatel 25 million light years. It is interacting gravitationally with a smaller companion galaxy cataloged NGC 4485. This pair is included in the ARP catalog of peculiar galaxies as ARP 269[1,2]. These galaxies are known for being one of the closest interacting galactic systems to the Milky Way. The interaction with NGC 4485 has produced a high star formation rate in NGC 4490[1,2]. The Spitzer Space Telescope has detected a double neucleus in NGC 4490. One neucleus is visible in the optical and one only visible at infrared and radio wavelengths. Both galaxies are connected with a stream of material about 25,000 light years in length[3}. NGC 4485 has already made its closest approach and is now moveing away from NGC 4490.References
2A. Lawrence, et al.: https://arxiv.org/pdf/2001.05601.pdf