B33
E557732
B33 is the catalog designation for the Horsehead Nebula, a dark molecular cloud in the constellation Orion whose distinctive silhouette resembles a horse’s head.
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
dark nebula
ⓘ
molecular cloud ⓘ |
| alsoKnownAs | Horsehead Nebula NERFINISHED ⓘ |
| angularSize | approximately 8 arcminutes by 6 arcminutes ⓘ |
| appearsIn | Orion’s Belt region NERFINISHED ⓘ |
| backlitBy | IC 434 NERFINISHED ⓘ |
| bestSeenFrom | dark-sky sites ⓘ |
| bestSeenWith | long-exposure astrophotography ⓘ |
| cataloguedBy | Edward Emerson Barnard NERFINISHED ⓘ |
| catalogueEntryNumber | 33 ⓘ |
| composedPrimarilyOf | molecular hydrogen ⓘ |
| contains |
cold gas
ⓘ
dust ⓘ |
| declination | −02° 27′ 30″ ⓘ |
| distanceFromEarth |
approximately 1375 light-years
ⓘ
approximately 420 parsecs ⓘ |
| hasApparentMagnitude | approximately 6.8 (region as a whole) ⓘ |
| hasCatalogDesignation | B33 ⓘ |
| hasDensity | higher than surrounding IC 434 region ⓘ |
| hasFeature |
bright rim on side facing ionizing radiation
ⓘ
dense pillar-like structure ⓘ |
| hasSilhouetteShape | horse’s head ⓘ |
| hasStructure | clumpy and filamentary gas ⓘ |
| ionizedBy | nearby massive stars in Orion OB1 association ⓘ |
| isDarkAgainst | emission nebula IC 434 NERFINISHED ⓘ |
| isIconicFor | its horsehead-shaped silhouette in astrophotography ⓘ |
| isSiteOf | ongoing star formation ⓘ |
| liesIn |
Milky Way galaxy
NERFINISHED
ⓘ
Orion Arm of the Milky Way NERFINISHED ⓘ |
| locatedIn | Orion Molecular Cloud Complex NERFINISHED ⓘ |
| locatedInConstellation | Orion NERFINISHED ⓘ |
| near |
Flame Nebula NGC 2024
NERFINISHED
ⓘ
bright star Alnitak ⓘ reflection nebula NGC 2023 NERFINISHED ⓘ |
| obscures | background H-alpha emission ⓘ |
| observedBy |
Hubble Space Telescope
NERFINISHED
ⓘ
Submillimeter and radio observatories ⓘ Very Large Telescope NERFINISHED ⓘ |
| observedIn | Barnard Catalogue of Dark Markings in the Sky NERFINISHED ⓘ |
| partOf | Orion B molecular cloud NERFINISHED ⓘ |
| rightAscension | 05h 40m 59s ⓘ |
| spectralFeaturesInclude | molecular lines such as CO ⓘ |
| temperature | about 10 Kelvin in densest regions ⓘ |
| visibleIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.