NGC 2715 – a Vera Rubin Galaxy
| Designation(s) | NGC 2715 |
| Object Type(s) | Galaxy |
| Relevant Catalog(s) | All (Chron), NGC |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Camelopardalis |
| Date and Time Observed | 2025-11-20 23:15:00 |
| Instrument | EdgeHD 8" w/f7 reducer-1,422mm FL |
| Camera | Player One Apollo-M Mini |
| Image Details | Up is 259.8 degrees E of N. Transparency: Good. Seeing: Good. Total integration time was 31m. Exposures 15s@225g, No filter. Dithered and recentered in SharpCap. No guiding. |
| Description | In researching my Arp talk, I downloaded and read Vera Rubin's classic paper published in 1980 where she measured the rotation curves of 21 spiral galaxies ("Sc" or "Sbc" in the Hubble system) and hypothesized the existence of Dark Matter. She found "Neither high nor low luminosity Sc galaxies have falling rotation curves. Sc galaxies of all luminosities must have significant mass located beyond the optical image." NGC 2715 could have been included in the Atlas of Peculiar Galaxies classified as "one heavy arm". It is potentially related to Arp 225 located about 40 arc minutes to the west-northwest. They both have similar red-shifts. (Thanks to Mantrap Skies for pointing this out). |
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