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Created page with "{{Night Sky | image = | designation =IC 1805<br/>Sharpless 2-190 | rightascension =02<sup>h</sup> 33<sup>m</sup> 22<sup>s</sup><ref name=constellation-guide>[ht..."
{{Night Sky
| image =
| designation =IC 1805<br/>Sharpless 2-190
| rightascension =02<sup>h</sup> 33<sup>m</sup> 22<sup>s</sup><ref name=constellation-guide>[http://www.constellation-guide.com/heart-nebula/ Heart Nebula] from constellation-guide.com</ref>
| declination =+61° 26′ 36″<ref name=constellation-guide/>
| distance =7,500 ly<ref name=constellation-guide/>
| constellation =Cassiopeia
| type =Emission nebula
| dimensions =150 x 150'<ref name=constellation-guide/>
| magnitude =Apparent Mag: +18.3<ref name=constellation-guide/><br/>Absolute Mag: +6.5<ref name=constellation-guide/>
| redshift =-0.000159±0.000060<ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=IC+1805&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id IC 1805] from simbad.u-strasbg.fr/simbad</ref>
| radvelocity =-47.64±18.09 km/s<ref name=simbad/>
| propmotion =RA: -1.89 mas/yr<ref name=simbad/><br/>Dec.: -2.01 mas/yr<ref name=simbad/>
| parallax =
}}
The '''Heart nebulae''' (IC 1805, Sharpless 2-190) is an [[emission nebula]] in the [[constellation]] of [[Cassiopeia]],<ref name=constellation-guide/> Also known as the "Running Dog nebula," it is well-known for its intense red color and [[dust]] lanes that produce its distinctive heart shape. It forms a famous pair with the [[Soul nebula]], called the Heart and Soul nebula. These two nebulae are in fact connected via a bridge of [[gas]]. With its high [[star magnitude|magnitude]] +18.3, the nebula is hard to observe with small telescopes. It is best seen through astrophotography, making it a popular target for astrophotographers. The nebula is located close to Maffei 1 and Maffei 2, the two brightest [[galaxies]] in the Maffei Group. The brightest part of the nebula is classified as NGC 896 in the [[New General Catalogue]] as it was discovered before the whole nebula was observed.<ref>[https://www.space.com/38657-heart-nebula-deep-space-photo.html Star-Speckled Heart Nebula Glows Red in Lovely Deep-Space Photo] from space.com</ref>
==Properties and Structure==
Lying around 7,500 [[light year]]s away, the nebula appears to have dimensions of 150x150 arcminutes on the night sky.<ref name=constellation-guide/> This is around 5 times the diameter of a [[full Moon]] and corresponds to physical size of around 100 light years across.<ref name=apod>[https://apod.nasa.gov/apod/ap090214.html IC 1805: The Heart Nebula] from apod.nasa.gov</ref> The nebula is located in the Perseus arm of the [[Milky Way]]. The system is also thought to have once contained a microquasar.
The red color of the nebula comes from a particular excitation of the [[hydrogen]] [[gas]] in the nebula and is common to many [[emission nebula]]e. Radiation emitted by a small [[open star cluster]] (designated Melotte 15) excites the surrounding hydrogen gas which then produces the characteristic red color when the atoms de-excite. The stars in this cluster are [[supergiant|blue supergiant star]]s. Extremely luminous in nature, these stars are situated in the centre of the nebula and have a mass around 50 times that of the [[Sun]].<ref name=constellation-guide/> The cluster also contains less massive and fainter stars.
==References==
{{reflist}}
{{Nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]
| image =
| designation =IC 1805<br/>Sharpless 2-190
| rightascension =02<sup>h</sup> 33<sup>m</sup> 22<sup>s</sup><ref name=constellation-guide>[http://www.constellation-guide.com/heart-nebula/ Heart Nebula] from constellation-guide.com</ref>
| declination =+61° 26′ 36″<ref name=constellation-guide/>
| distance =7,500 ly<ref name=constellation-guide/>
| constellation =Cassiopeia
| type =Emission nebula
| dimensions =150 x 150'<ref name=constellation-guide/>
| magnitude =Apparent Mag: +18.3<ref name=constellation-guide/><br/>Absolute Mag: +6.5<ref name=constellation-guide/>
| redshift =-0.000159±0.000060<ref name=simbad>[http://simbad.u-strasbg.fr/simbad/sim-id?Ident=IC+1805&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id IC 1805] from simbad.u-strasbg.fr/simbad</ref>
| radvelocity =-47.64±18.09 km/s<ref name=simbad/>
| propmotion =RA: -1.89 mas/yr<ref name=simbad/><br/>Dec.: -2.01 mas/yr<ref name=simbad/>
| parallax =
}}
The '''Heart nebulae''' (IC 1805, Sharpless 2-190) is an [[emission nebula]] in the [[constellation]] of [[Cassiopeia]],<ref name=constellation-guide/> Also known as the "Running Dog nebula," it is well-known for its intense red color and [[dust]] lanes that produce its distinctive heart shape. It forms a famous pair with the [[Soul nebula]], called the Heart and Soul nebula. These two nebulae are in fact connected via a bridge of [[gas]]. With its high [[star magnitude|magnitude]] +18.3, the nebula is hard to observe with small telescopes. It is best seen through astrophotography, making it a popular target for astrophotographers. The nebula is located close to Maffei 1 and Maffei 2, the two brightest [[galaxies]] in the Maffei Group. The brightest part of the nebula is classified as NGC 896 in the [[New General Catalogue]] as it was discovered before the whole nebula was observed.<ref>[https://www.space.com/38657-heart-nebula-deep-space-photo.html Star-Speckled Heart Nebula Glows Red in Lovely Deep-Space Photo] from space.com</ref>
==Properties and Structure==
Lying around 7,500 [[light year]]s away, the nebula appears to have dimensions of 150x150 arcminutes on the night sky.<ref name=constellation-guide/> This is around 5 times the diameter of a [[full Moon]] and corresponds to physical size of around 100 light years across.<ref name=apod>[https://apod.nasa.gov/apod/ap090214.html IC 1805: The Heart Nebula] from apod.nasa.gov</ref> The nebula is located in the Perseus arm of the [[Milky Way]]. The system is also thought to have once contained a microquasar.
The red color of the nebula comes from a particular excitation of the [[hydrogen]] [[gas]] in the nebula and is common to many [[emission nebula]]e. Radiation emitted by a small [[open star cluster]] (designated Melotte 15) excites the surrounding hydrogen gas which then produces the characteristic red color when the atoms de-excite. The stars in this cluster are [[supergiant|blue supergiant star]]s. Extremely luminous in nature, these stars are situated in the centre of the nebula and have a mass around 50 times that of the [[Sun]].<ref name=constellation-guide/> The cluster also contains less massive and fainter stars.
==References==
{{reflist}}
{{Nebulae}}
[[Category:Astronomy]]
[[Category:Nebulae]]