NGC4103 (Open cluster) The Longtail
From Perth, NGC4103 is visible all night. It will become visible around 19:05 (AWST), 39° above your south-eastern horizon, as dusk fades to darkness. It will be lost to dawn twilight around 05:30, 27° above your south-western horizon. NGC 4103 has been studied photometrically. for 512 stars brighter than V = 17m magnitudes and colours are given.
It was discovered by James Dunlop in 1826. It is located approximately 5,000 light years away from Earth, in the Carina-Sagittarius arm
Other names
Cr 252[3]
Mel 109[4]
Position
Constellation: Crux
Magnitude: 7.40 (V) [4]
Right ascension: 12h06m [2]
Declination: -61°15' [2]
Distance: 1.6 kpc
5.3 klyr [1]
Derived quantities
Absolute mag (V): -3.66 Equipment: GSO 10" f/8 Truss RC Losmandy G11 Mount guided PHD2, Orion Starshoot on 60mm guide scope. QHY 268c one shot colour camera, -10c, Gain 57 Offset 30 NINA capture software, with Optonlong L Extreme filter Time/Locale: 120frames 2hrs captured 04/04/2023 Bortle 6, Najm Nazm Observatory Kelmscott WA, 94% moon Processing: Stacked DSS, then P2, PS6
Lovely cluster! Thanks for sharing the pic. My 10yo son accidentally found this cluster last night when we were touring the many double stars in Crux. He saw it pass by the field of view when slewing and managed to pan back to it. Splendid view in the C11!
