Statements (22)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
gptkb:planetary_nebula
|
| gptkbp:alsoKnownAs |
gptkb:NGC_7662
Blue Snowball Nebula |
| gptkbp:angularSize |
32 arcseconds
|
| gptkbp:apparentMagnitude |
8.6
|
| gptkbp:catalogue |
gptkb:Caldwell_catalogue
gptkb:NGC_catalogue |
| gptkbp:centralStarType |
white dwarf
|
| gptkbp:constellation |
gptkb:Andromeda
|
| gptkbp:declination |
+42° 32′ 06″
|
| gptkbp:discoveredBy |
gptkb:William_Herschel
|
| gptkbp:discoveredIn |
1784
|
| gptkbp:distanceFromEarth |
about 2,200 light-years
|
| https://www.w3.org/2000/01/rdf-schema#label |
Caldwell 21
|
| gptkbp:locatedIn |
gptkb:Milky_Way
|
| gptkbp:notableFor |
bright blue color
well-defined structure |
| gptkbp:observedBy |
amateur telescopes
|
| gptkbp:rightAscension |
23h 25m 54.7s
|
| gptkbp:shape |
elliptical
|
| gptkbp:bfsParent |
gptkb:NGC_4449
|
| gptkbp:bfsLayer |
7
|