NGC 2742 – a Vera Rubin Galaxy
| Designation(s) | NGC 2742 |
| Object Type(s) | Galaxy |
| Relevant Catalog(s) | All (Chron), NGC |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Ursa Major |
| Date and Time Observed | 2025-11-20 20:47:00 |
| 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 32m. 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." Still pretty early, the weather settled down pretty well for this capture, a beautiful grand design spiral. BTW, this was another William Herschel discovery. |
| Catalog Links | <Previous | All Listings | Next> |
