NGC 2998 – 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 | Ursa Major |
| Date and Time Observed | 2026-01-22 22:34:00 |
| 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: Poor. Seeing: Fair. Total integration time was 28m 40s. Exposures 20s@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." A handsome spiral surrounded by no fewer than 6 other NGC Galaxies: NGC 3000, NGC 3002, NGC 3004, NGC 3005, NGC 3006, NGC 3008 plus a few tiny ones. Unfortunately a pretty mediocre evening for imaging cut short by clouds. |
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