Messier 33
Messier 33 (M33, NGC 598) sī chi̍t-ê chhiⁿ-hē, tī thiⁿ-kiû ê ūi-tì tī Triangulum-chō.
| Triangulum Galaxy | |
|---|---|
 Galaxy Messier 33 in Triangulum | |
| Observation data (J2000 epoch) | |
| Pronunciation | /traɪˈæŋɡjʊləm/ |
| Constellation | Triangulum |
| Right ascension | 01h 33m 50.02s[1] |
| Declination | +30° 39′ 36.7″[1] |
| Redshift | -0.000607 ± 0.000010[1] |
| Helio radial velocity | -179 ± 3 km/s[2] |
| Galactocentric velocity | -44 ± 6 km/s[2] |
| Distance (comoving) | 970 kpc (3.2 Mly)[3] |
| Apparent magnitude (V) | 5.72[1] |
| Characteristics | |
| Type | SA(s)cd[2] |
| Mass | 5 × 1010[4] M☉ |
| Number of stars | 40 billion (4×1010)[6] |
| Size |
18.74 kpc (61,120 ly) (diameter; 25.0 mag/arcsec2 B-band isophote)[5][6] |
| Apparent size (V) | 70.8 × 41.7 moa[1] |
| Other designations | |
| NGC 0598, MCG+05-04-069, UGC 1117, PGC 5818[2] | |
Tsù-kái
siu-kái- ↑ 1.0 1.1 1.2 1.3 1.4 Ín-iōng chhò-gō͘: Bû-hāu ê
<ref>tag; chhōe bô chí-miâ ê ref bûn-jīSIMBAD-M33 - ↑ 2.0 2.1 2.2 2.3 Ín-iōng chhò-gō͘: Bû-hāu ê
<ref>tag; chhōe bô chí-miâ ê ref bûn-jīned - ↑ Ín-iōng chhò-gō͘: Bû-hāu ê
<ref>tag; chhōe bô chí-miâ ê ref bûn-jīvivian - ↑ Ín-iōng chhò-gō͘: Bû-hāu ê
<ref>tag; chhōe bô chí-miâ ê ref bûn-jīmnras342_1 - ↑ De Vaucouleurs, Gerard; De Vaucouleurs, Antoinette; Corwin, Herold G.; Buta, Ronald J.; Paturel, Georges; Fouque, Pascal (1991). Third Reference Catalogue of Bright Galaxies. Bibcode:1991rc3..book.....D.
- ↑ 6.0 6.1 Ín-iōng chhò-gō͘: Bû-hāu ê
<ref>tag; chhōe bô chí-miâ ê ref bûn-jīmichon