DeepSkyFreak
Aktives Mitglied
Hallo Leute!
Ich habe gestern mal Kugelhaufen und Sternhaufenjagd in M31 betrieben - war ueberrascht, was ich alles finden konnte. Hier der Bericht - verzeiht mir, dass er in Englisch ist, aber durch meine vielen internationalen Kontakte schreibe ich Berichte bloss noch in Englisch:
On 16/17 11 04 I took the chance of perfect seeing and fairly good visibility to hunt for extragalactic globular clusters and open clusters in M31. As reference I did use a picture of M31 from the Night Sky Observers Guide. 43 GCs, OCs and stellar Associations are plotted on that map. The brightness and sizes of the objects I did take from the Internet.
On earlier occasions I did experience that perfect seeing is much more important to possible resolution of faint stars and almost stellar objects than very clear skies with medium to bad seeing. Seeing last night was better than 1" and naked eye limit approx 5,5mag. M31 was very high in the sky (~60+° during my observations).
In order to describe the level of difficulty for observing single objects, I created a 5-level scale: (1) direct vision, easy, (2) direct vision, difficult, averted vision very easy, (3) averted vision only but fairly easy (4) averted vision only, difficult, (5) averted vision only and temporarily, extremely difficult.
All object observations were done with my 15" f4,5 Obsession scope with 5mm Nagler T6 eyepiece (342x magnification). To locate the area of the objects I did use the Nagler 13mm (131x). I might also say that apart from two bright objects I was not able to spot any GCs or OCs with lower magnifications (131x or 78x).
G64: (5), 00 40,5 +41 22 02,3, V 15,1 extremely faint and stellar. Seen with AV (averted vision) only.
G72: (5), 00 40 52,8 +41 18 54,2, V 15,0 just like G64, stellar and extremely faint. AV only.
G73: (2), 00 40,9 +41 41 15, V 15,0 just non-stellar, very faint but directly seen.
G76: (1), 00 41,1 +40 36 3,6, V 14,2 very easy, directly visible as a stellar object. With AV it turns into a non-stellar smudge. Bright.
G87: (5), 00 41 14,7 +40 55 52, V 15,6 most difficult of all objects seen. I could glimpse it only 4,5 times in 10 minutes. I could not confirm whether G87 was stellar or non-stellar.
G119: (4-5), 00 41,9 +40 47 2,7, V 15,0 stellar, very difficult with averted vision (AV).
G156: (5), 00 42 25,3 +40 57 18, V 15,6 stellar and very faint with AV.
G213: (3), 00 43,2 +41 07 2,5, V 14,7 non stellar smudge without core, fairly easy with AV.
G226: (4), 00 43 30,3 +41 38 56, V 15,5 non-stellar smudge with averted vision, on the edge of visibility.
G244: (5), 00 43,8 +41 37 2,6, V 15,4 pops up only temporarily with averted vision, extremely faint, stellar.
G252: (3), (?) features a stellar core and a halo that was seen with averted vision. Fairly easy.
G279: (5), 00 44,5 +41 29 2,9, V 15,4 extremely faint smudge with no central brightening or stellar core. ~3". AV only.
G280: (1), 00 44,5 +41 22 2,5, V 14,2 easy, stellar, could be seen directly.
C107: (3-4), 00 40,5 +40 36, 4-5" size. No distinct core. Biggest of all observed objects. AV only, not too difficult.
C202: (4), 00 42,1 +40 57, stellar and difficult with AV.
C410: (5), 00 44,4 +41 21, extremely faint 3-4" smudge of light. AV only. Barely visible.
It should be noted that the observed size of objects described as non-stellar or as smudge, was never more than approx 2-3". It is almost impossible to tell the size when an object is so extremely faint and visible only with averted vision. Therefore a simple description as non-stellar is all that can be determined.
I was amazed who far I could push the limit of my 15 inch under conditions of last night.
Clear Skies und viel Spass wer auch auf die Jagd geht!
Armin
Ich habe gestern mal Kugelhaufen und Sternhaufenjagd in M31 betrieben - war ueberrascht, was ich alles finden konnte. Hier der Bericht - verzeiht mir, dass er in Englisch ist, aber durch meine vielen internationalen Kontakte schreibe ich Berichte bloss noch in Englisch:
On 16/17 11 04 I took the chance of perfect seeing and fairly good visibility to hunt for extragalactic globular clusters and open clusters in M31. As reference I did use a picture of M31 from the Night Sky Observers Guide. 43 GCs, OCs and stellar Associations are plotted on that map. The brightness and sizes of the objects I did take from the Internet.
On earlier occasions I did experience that perfect seeing is much more important to possible resolution of faint stars and almost stellar objects than very clear skies with medium to bad seeing. Seeing last night was better than 1" and naked eye limit approx 5,5mag. M31 was very high in the sky (~60+° during my observations).
In order to describe the level of difficulty for observing single objects, I created a 5-level scale: (1) direct vision, easy, (2) direct vision, difficult, averted vision very easy, (3) averted vision only but fairly easy (4) averted vision only, difficult, (5) averted vision only and temporarily, extremely difficult.
All object observations were done with my 15" f4,5 Obsession scope with 5mm Nagler T6 eyepiece (342x magnification). To locate the area of the objects I did use the Nagler 13mm (131x). I might also say that apart from two bright objects I was not able to spot any GCs or OCs with lower magnifications (131x or 78x).
G64: (5), 00 40,5 +41 22 02,3, V 15,1 extremely faint and stellar. Seen with AV (averted vision) only.
G72: (5), 00 40 52,8 +41 18 54,2, V 15,0 just like G64, stellar and extremely faint. AV only.
G73: (2), 00 40,9 +41 41 15, V 15,0 just non-stellar, very faint but directly seen.
G76: (1), 00 41,1 +40 36 3,6, V 14,2 very easy, directly visible as a stellar object. With AV it turns into a non-stellar smudge. Bright.
G87: (5), 00 41 14,7 +40 55 52, V 15,6 most difficult of all objects seen. I could glimpse it only 4,5 times in 10 minutes. I could not confirm whether G87 was stellar or non-stellar.
G119: (4-5), 00 41,9 +40 47 2,7, V 15,0 stellar, very difficult with averted vision (AV).
G156: (5), 00 42 25,3 +40 57 18, V 15,6 stellar and very faint with AV.
G213: (3), 00 43,2 +41 07 2,5, V 14,7 non stellar smudge without core, fairly easy with AV.
G226: (4), 00 43 30,3 +41 38 56, V 15,5 non-stellar smudge with averted vision, on the edge of visibility.
G244: (5), 00 43,8 +41 37 2,6, V 15,4 pops up only temporarily with averted vision, extremely faint, stellar.
G252: (3), (?) features a stellar core and a halo that was seen with averted vision. Fairly easy.
G279: (5), 00 44,5 +41 29 2,9, V 15,4 extremely faint smudge with no central brightening or stellar core. ~3". AV only.
G280: (1), 00 44,5 +41 22 2,5, V 14,2 easy, stellar, could be seen directly.
C107: (3-4), 00 40,5 +40 36, 4-5" size. No distinct core. Biggest of all observed objects. AV only, not too difficult.
C202: (4), 00 42,1 +40 57, stellar and difficult with AV.
C410: (5), 00 44,4 +41 21, extremely faint 3-4" smudge of light. AV only. Barely visible.
It should be noted that the observed size of objects described as non-stellar or as smudge, was never more than approx 2-3". It is almost impossible to tell the size when an object is so extremely faint and visible only with averted vision. Therefore a simple description as non-stellar is all that can be determined.
I was amazed who far I could push the limit of my 15 inch under conditions of last night.
Clear Skies und viel Spass wer auch auf die Jagd geht!
Armin
)) 