|Apparent size:||30′ x 15′|
|Diameter:||25.6 light years.|
|Distance:||2,900 light years.|
I took a chance on a 30% cloudy pre-sunset evening. The weather has not been suitable for astronomy recently at all and I’ll take what I can get. After it got dark – and just as my preliminary set up calibrations were completed – it swiftly clouded over.
I’m still imaging from home, despite the relatively low covid risk here in Australia, so I waited patiently and hopefully.
Lo and behold! around 10.30 pm the clouds abruptly dissipated – completely. 😁
So I got an hour and a half of data on Lower’s Nebula, Sh2-261, which is an emission nebula of ionised hydrogen gas, located about 9° north of the red giant star Betelgeuse.
Lower’s Nebula was not discovered until 1939, despite it’s relatively bright +10.0 magnitude.
The bright star (far left) is f1 Orionis, a Class B star visible to the naked eye at 4.96 magnitude.
|Feature image date:||2021-02-06|
|Exposure:||100 minutes (28 stacked frames @ 215.6 sec)|
|Field of View:||1.59° x 1.06° (up is 23.2 degrees E of N)|
If the Astrometry images do not appear it is because the Astrometry website is sometimes off line.
|SkyWatcher Esprit 120 mm apochromatic 3-element refractor; 840 mm f/l @ f/7.|
|Field flattener; ZWO Duo-band Hα (656nm) and OIII (500nm) filter.|
|SkyWatcher EQ6-R Pro mount; ZWO ASI120 guide camera.|
|Imaging camera: ZWO ASI 071 MC Pro (CMOS 28.4mm 16 Mpx).|
|Software: EQMOD, PHD2, SharpCap, Gimp.|
|Observatory location: 34° South.|
Images © Roger Powell
I’m a founder member of Macarthur Astronomical Society