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Saturday, July 13, 2013
Sunday, June 24, 2012
Epsilon Bootis
I made a new observation of Izar tonight and confirmed what I suspected:
this is my favorite double. The six-inch scope does a perfect job
showing off the amazing diffraction pattern. The blue secondary buzzing
in the midst of the orange-yellow pattern is stunning and hypnotic. This
also gave me an opportunity to measure PA and separation which agreed
nicely with WDS 2010 data. If you haven't observed this incredible pair
yet, be sure to give it a look when Bootes is high in the sky.
| Subject | Epsilon Bootis (Izar / Struve 1877) |
| Classification | Double Star |
| Position (J2000) | Bootes [RA: 14 44 59.22 / Dec: +27 04 27.21]* |
| Position Angle* | 343° [My Measurement 2012.4] 343°[WDS 2010]* |
| Separation* | 2.6" [My Measurement 2012.4] 2.8"[WDS 2010]* |
| Magnitudes* | 2.6 / 4.8 |
| Spectral Types* | K0II-III / A2V |
| Date/Time | JUNE 11, 2012 - 10:20 PM MST (JUNE 12, 2012 - 05:20 UT) |
| Observing Loc. | Flagstaff, AZ - Home |
| Instrument | Orion SVP 6LT Reflector (150 mm dia./1200 mm F/L) |
| Eyepieces/Mag. | Pentax XW10 + 2X Barlow (240X); 12 mm Meade Astrometric EP + 2X Barlow (200X); 5 mm UO Orthoscopic EP + 2X Barlow (300X) |
| Conditions | Clear, calm |
| Seeing | 5/10 Pickering |
| Transparency | 20.4 mag./arcsec^2 |
| *References | The Washington Visual Double Star Catalog (Mason+, 2001-2012); 1958PASP...70..168B - Publ. Astron. Soc. Pac., 70, 168-179 (1958) - 01.01.86 23.03.00 |
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