Den NGC 4138 ass eng Spiralgalaxie am Stärebild Canes Venatici.
Si gouf am Joer 1788 vum William Herschel mat engem 18,7-Zoll-Spigelteleskop entdeckt.
 Foto, opgeholl mam Hubble-Weltraumteleskop. | |
| Stärebild |
Canes Venatici (CVn) |
|---|---|
| Positioun fir d'Equinoxe J2000.0 | |
| Rektaszensioun | 12h 09m 29,7s |
| Deklinatioun | + 43° 41' 08"[1] |
| Ausgesinn | |
| Hubble-Sequenz | S0-a |
| Visuell Magnitude | 11,3 mag |
| Visuell Magnitude (B-Band) | 12,2 mag |
| Wénkelduerchmiesser | 2,6 × 1,7 |
| Geschicht | |
| Entdecker | William Herschel |
| Entdeckungsdatum | 1788 |
| Katalog- an Entdeckerbezeechnungen | |
| CGCG | 215-37 |
| GC | 2745 |
| H | I-196 |
| MCG | +7-25-35 |
| NGC | 4138 |
| PGC | 38643 |
| UGC | 7139 |
| 2MASX | J12092978+4341071 |
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