If you live near 35 degrees North Latitude, and enjoy overcoming the adversity of observing far southern objects, you may want to give the double star Pi Lupi a try. This pair rises no more than 8 degrees above the horizon where I live. Unlike Gamma Velorum, it is a fairly close double. SItting in the mush above the neighbor’s houses, I had to be very patient to catch glimpses of the two components as separate, swimming points. Discerning color was also difficult with all the distortion, but overall the pair had a bluish white appearance. I estimated a position angle of either 60 or 240 degrees, depending on which was the primary. The Washington Visual Double Star Catalog gives a 1983 value of 70.5 degrees, and a separation of 1.5 arc seconds. The sketch above contains a frozen detail to give you an idea of what the mushy view looked like in general. Clicking the image for the large version may help see that inset better.
|Subject||Pi Lupi (HJ 4728)|
|Position (J2000)||Lupus [RA: 15:05:07 / Dec: -47:03:04]*|
|Position Angle*||70.5Â° (1983)|
|Spectral Types*||B5; B5|
|Date/Time||JAN 26, 2007 – 06:40 AM MST (JAN 26, 2007 – 13:40 UT)|
|Observing Loc.||Flagstaff, AZ – Home|
|Instrument||Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L)|
|Eyepieces/Mag.||10 mm + 2X Barlow (240X)|
|Conditions||Clear, calm, 18Â° F|
|Transparency||NELM Mag ~4.0|
|References||The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)|
*Based on published data.