Heart Nebula

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Heart Nebula
IC1805 -- H-alpha + RGB.jpg
The Heart Nebula
Observation data: J2000.0 epoch
Type Emission
Right ascension 02h 32m 35.57s
Declination +61° 29′ 2.3″
Distance 7,500 ly
Apparent magnitude (V) 18.3
Apparent dimensions (V) 60.0'x60.0'
Constellation Cassiopeia
Physical characteristics
Radius -
Absolute magnitude (V) 6.5
Notable features -
Other designations IC1805, Sharpless -2 190
See also: Diffuse nebula, Lists of nebulae

The Heart Nebula, IC 1805, Sh2-190, lies some 7500 light years away from Earth and is located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. This is an emission nebula showing glowing gas and darker dust lanes. The nebula is formed by plasma of ionized hydrogen and free electrons.

The very brightest part of this nebula (the knot at the right) is separately classified as NGC 896, because it was the first part of this nebula to be discovered.

The nebula's intense red output and its configuration are driven by the radiation emanating from a small group of stars near the nebula's center. This open cluster of stars known as Melotte 15 contains a few bright stars nearly 50 times the mass of our Sun, and many more dim stars that are only a fraction of our Sun's mass. The cluster used to contain a microquasar that was expelled millions of years ago.


A portion of the nebula can be seen at the right of this image.


External links[edit]

Coordinates: Sky map 02h 33m 00s, +61° 27′ 00″