#1  
Old 03-02-2010, 09:36 PM
barx1963's Avatar
barx1963 (Malcolm)
Bright the hawk's flight

barx1963 is offline
 
Join Date: Nov 2008
Location: Waurn Ponds Vic
Posts: 3,789
Double Time!!

Well the Moons been up and the skies been mucky, time to get some double stars under the belt!
Where I have referred to documented info, I am using either Hartung (2nd ed. 1984) or Double Stars for Small Telescopes by Sissy Haas (2008)

Mu Carina (Hartung 356)
Both stars are brilliant white. Hartungs gives mags of 3.2 and 6.0 with a 5" seperation. Easily split at moderate power, but brightness differential was not as great as expected.

Alpha Crucis (Hartung 462)
Brilliant double, very close in magnitude. Both appear white in colour. Hartungs gives mags 1.6 and 2.1. Estimate sep. to be about 5" which agrees with documentation of 4.4". Wide companion of about mag 5 is approx 70" away to Sp. This is a very nice target and is getting better at the moment.

Iota Leporis (Hartung 151)
Fairly bright naked eye star. About 4deg south of Rigel is wide trapezium of 4 stars. Target is Np corner. Primary is white, speck sitting almost within its glare is estimated to be about mag 10, Very reminiscent of Rigel.

Kappa Leporis (Hartung 153)
Located approx 1deg S of Iota Leporis. Needs higher power (230x) but still is almost a figure 8. Better seeing may allow clearer seperation. Hard to see significant brightess difference. A challenging object.

h3759 (In Lepus)
Fairly wide double at 115x. Lies about 1.5deg NNp of Beta Leporis (Nihal). Primary is brilliant yellow, companion about 30" away is recorded as cobalt blue. Just a hint of blue was visible.

Lal 1 (In Lepus)
Easy pair. Located about 2deg just p of North of Gamma Leporis. Estimated sep to be about 15" which is close to do0cumented value of 11". Estimate mags to be 6 and 8, again documented values are 6.9 and 7.9. Primary is clear white, secondary colour not clear due to seeing.

Gamma Leporis (Hartung 193)
Wide pair sep is about 1.5'. Clear yellow primary with suggestion of red or even mauve in secondary.
Reply With Quote
  #2  
Old 03-02-2010, 10:02 PM
pgc hunter's Avatar
pgc hunter
Registered User

pgc hunter is offline
 
Join Date: Feb 2009
Location: Renmark, SA
Posts: 2,938
A good route to take when teh moon is out! What's the seperation of Kappa Leporis?
Reply With Quote
  #3  
Old 03-02-2010, 10:09 PM
barx1963's Avatar
barx1963 (Malcolm)
Bright the hawk's flight

barx1963 is offline
 
Join Date: Nov 2008
Location: Waurn Ponds Vic
Posts: 3,789
Saas gave 2", Hartungs gives 2.3". Hartungs mentions that sep is slowly narrowing, so that appears to be the case given thats Saas used data from a 2004 observation. I didn't make a direct measurement as I couldn't adequately seperate in my 12mm astrometric EP.
Reply With Quote
  #4  
Old 04-02-2010, 03:54 PM
orestis's Avatar
orestis
Registered User

orestis is offline
 
Join Date: Jun 2009
Location: southern highlands, Australia
Posts: 679
[QUOTE=barx1963;555506]

Alpha Crucis (Hartung 462)
Brilliant double, very close in magnitude. Both appear white in colour. Hartungs gives mags 1.6 and 2.1. Estimate sep. to be about 5" which agrees with documentation of 4.4". Wide companion of about mag 5 is approx 70" away to Sp. This is a very nice target and is getting better at the moment.

[QUOTE=barx1963;555506]



Very nice report Malcolm,Exactly what i do if its a full moon.

Your description of Alpha Crucis is nearly exactly like what i saw yesterday unfortunately the clouds came racing in before i even got 2 mins.
One thing i found odd is that you didn't mention the triangle shape it gives,like an isoceles triangle.It is a magnificent double.

Keep up the good work
Regards orestis
Reply With Quote
  #5  
Old 04-02-2010, 04:55 PM
barx1963's Avatar
barx1963 (Malcolm)
Bright the hawk's flight

barx1963 is offline
 
Join Date: Nov 2008
Location: Waurn Ponds Vic
Posts: 3,789
Thanks Orestis.
I did note the isoceles triangle when observing but didn't include that in my notes. Was more interested in making an estimate of the seperation.
Reply With Quote
  #6  
Old 04-02-2010, 08:02 PM
Paddy's Avatar
Paddy (Patrick)
Canis Minor

Paddy is offline
 
Join Date: Jun 2007
Location: Strangways, Vic
Posts: 2,208
'Tis indeed a good idea for full moon viewing. Nice report Malcolm.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 09:06 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
NexDome Observatories
Advertisement
Bintel
Advertisement
Meade Australia
Advertisement
Lunatico Astronomical
Advertisement
Celestron Australia
Advertisement
OzScopes Authorised Dealer
Advertisement
SkyWatcher Australia
Advertisement
Astronomy and Electronics Centre
Advertisement