(IAAC) Obj: Jabbah (Nu Sco) - Inst: 4.5" homemade Dobson reflector, f/8

[Ante Perkovic]

  Observer: Ante Perkovic
Your skills: Intermediate (some years)
Date/time of observation: August 20th 2003, 21.05h:
Location of site: above Sevid, near Trogir, Croatia (Lat 43.5 N, Elev 200m)
Site classification: Rural
Sky darkness: 6.0 <Limiting magnitude>
Seeing:
Moon presence: Minor - crescent or far from object
Instrument: 4.5" Homemade Dobson reflector, f/8 ("babydob")
Magnification: 25x, 48x, 79x, 96x
Filter(s): None
Object(s): Jabbah (Nu Sco)
Category: Multiple star
Class:
Constellation: Sco
Data: mag 4.0  size 41"
Position:
Description:
Jabbah is a quadruple star (in amateur telescopes). Two close pairs 41" 
apart are separated 1.3" (AB pair) and 2.4" (CD pair), respectively. 
Here's what I saw:
- 25x: Widely separated pair oriented N-S. Brighter star, AB, is north.
- 48x: I think I can resolve CD pair, but still not the AB.
- 79x: CD star still looks like a close pair oriented E-W. AB also looks 
like a close pair oriented E-W.
- 96x: My friend Igor saw AB star as a very close pair oriented N-S, 
while I think it was E-W. At the time, I though only one of those stars 
is close double, so I didn't check the CD star.