| Dominik Elsässer | ||||
| Star:
42 Orionis
Date: 05.01.99, 21.12-22.05 UT Seeing: 9 Sky Darkness: 4.3 (moonlight) Location: Kleinkahl, Germany Site Classification: Rural Telescope: Vixen 102M Magnification: 250x-320x |
This seems to be a hard
challenge for a 4" scope. Although seeing was really good tonight, I'm
not quite sure to what degree I was able to split this star. At
250x the Airy-disk looked absolutely ordinary.Only at 320x, I noticed a tiny "speck" in the diffraction pattern at ~Pa 200°-220°. Since this matches the data given in catalogues, I might have seen component B. However, in my opinion probably a somewhat larger refractor than mine might be necessary to achieve a clean split and confirm component B.
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| Jose Fernandez | ||||
| Star:
42 Orionis
Date & Time: 6 January 1999, 21:30 UT Seeing: 5 <1-10 Seeing Scale (10 best)> Location of site: Asturias - Spain. (Lat: 43º16' N, Lon: 6º 1' W, Elev: 900 mt) Site classification: Rural Sky darkness: 5 <Limiting magnitude> Telescope: Intes 6" Maksutov MK65 Magnification: 120x, 155x (Celestron 12.5 mm & Meade 9.7 mm) |
Once the MK65 is centered with the Meade 24.5 mm and using 120x I clearly see the arch formed among the starts PPM702315 and 45 Orionis. However, due to the light breeze and the seeing, the MK65 is not still and I can only split 42 Orionis at 155x for a few seconds every now and then. The primary was blue/white. | |||
| Chuck Layton | ||||
| Star:
42 Orionis
Date of Observation: Jan. 11, 1999 Time of Observation: 0530 UT Seeing (1 - 10, 10 best): 5 Site classification: Suburban Limiting Mag. (naked eye): 4.8 Instrument Used: 20cm f/6 Eq. Newtonian Magnification: 271X |
Observed Colorations of
Components: All components appear white.
Other comments: This pair has proved to be the most challenging so far. The magnitude difference made splitting this double very difficult. Averted vision definitely needed. |
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| Dave Mitsky | ||||
| Star:
42 Orionis
Date & Time: 1/30/99 06:23 UT Seeing: 4 <1-10 Seeing Scale (10 best)> Transparency: ~ 6 Location of site: ASH Naylor Observatory (http://www.msd.org/obs.htm) near Lewisberry, PA Site classification: Rural Sky darkness: ~ 5.0 <Limiting magnitude> Telescope: 17" f/15 classical Cassegrain Magnification: 118x, 202x |
Elongation was seen at 202x
but no clean split was achieved. At 1.6" this close pair consisting
of a 5.5 magnitude B2 star and a bluish 8.5 magnitude companion at a position
angle of 212 degrees requires steadier skies and higher magnification.
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| Richard Harshaw | ||||
| Star:
42 Orionis
Location of site: Northern Kansas City, Missouri (USA) 94d 30m west longitude, 39d 15m north latitude 980 ft above Mean Sea Level Date of observations (UT): 0430 on 12/31/99 Site classification: suburban Sky conditions: seeing-- 7 out of 10 transparency-- 8 out of 10 limiting visual magnitude-- 5 Temperature: 38 F Telescope: Celestron C-8 Eyepiece: 7.4mm w/ 2.48x Barlow (670x) |
This pair is
too close to measure with my illuminated reticule Micro-Guide so I can
only report visual impressions.
This pair was extremely difficult to split tonight, and only showed a clean split during brief moments of incredible seeing. Most of the time, the image was of a boiling "peanut". I noted colors of White and yellowish-White. The system is believed to be about 790 light years away, which would make it as bright as 33,000 Suns. Measurements from 1994:
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| Thad Robosson | ||||
| Star:
42 Orionis
Date & Time: 12-30-99, 3:00 to 6:30 UT (12-31-99 UT) Seeing: 4-5 <1-10 Seeing Scale (10 best)> Location of Site: Carbondale, IL, USA Site Classification: Suburban/near rural Sky darkness: 4.7 using "stars counted in the area of" method, (Taurus) <Limiting magnitude> Telescope: 8" f/6 Newt on Dob mount (soon to be split ring :-) Magnification: 174x |
Suspected,
but couldn't quite split. Tube currents and turbulence at fault here.
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| William L. Schart | ||||
| Star:
42 Orionis
Date & Time: 1/9/2000 10:48 PM CST Seeing: 7 <1-10 Seeing Scale (10 best)> Location of site: Killeen, TX (Lat 31 N, Elev 600 ft) Site classification: Suburban Sky darkness: 4.5 <Limiting magnitude> Telescope: Orion 6" Dob. Magnification: 72x, 120x, 144x, 240x |
The next group of stars down in the “sword.” There is a triangle formed by 42, 45, and a third, fainter star (V351) at the apex. No visible sign that this is a double at low power, I suspect elongation at 72x and 120x. At 144x, and 240x appears as a peanut shape. At higher power there is also some nebulousity visible around these 3, which the filter brought out more of. | |||
| Ilario Melandri | ||||
| Star:
42
Orionis
Date & Time: 4/Jan/2000 – 20.17 UC Seeing: 9 <1-10 Seeing Scale (10 best)> Location of site: Italy, Ravenna, San Romualdo, Lat 44 32’N Lon 12 08’E Elevation: 0 m Site classification: Rural Sky darkness: 4 <Limiting magnitude> Temperature: -1C Telescope: 150 mm f/15 achromatic refractor Magnification: 250x (Othoscopic eyepiece 9 mm) |
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| Orlon Petterson | ||||
| Star:
42
Orionis
Date & Time: 10:30-11:00 UTC 27 January 2000 Seeing: 7-8 Location: West Melton, New Zealand 43 deg S Location of site: Rural Instrument: 4" refractor Sky darkness: 6 Mag, possibly darker <Limiting magnitude> Magnification: 50x, 83x, 208x |
A break in the clouds at
the local astronomical society's observatory allowed for a bit of a go
at a few doubles, mostly the easy ones, but came to have another go at
this one which in the past I have never been able to split. The seeing
was good and mostly steady, and once the telescope had a chance to cool
down the image of 42 Ori settled down. A faint airy ring around the star
could be seen and on occasion a faint point of light appeared to the SSW
just between the disk and the ring at max magnification. I had to watch
it for a quite a few minutes to be sure I was actually seeing it. I'll
have to check on this one again in the future to see if I can get a better
view. Unfortunately the break in the clouds didn't last long so more observations
will have to wait.
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| John M. Ryan | ||||
| Star:
42
Orionis
Date of Observation: 2/02/00, 22:30UT Location of Observation: Ciudad Rodrigo, Salamanca, Spain 40º 36' N, 6º 32'W, Elev. 800 Meters Seeing: 6 to 7, fog began to degrade seeing (1 - 10, 10 best) Site classification: Urban Limiting Mag. (naked eye): 5 Instrument: Meade 8"SCT Magnification: 167x, 286x |
Separation (Clear or Touching):Clean
Split
Magnitude Comment: Primary much brighter than secondary. Data shows 5.5 & 8.5 Color Comment: Both components seemed pale blue. General Comment: At 167x I could note the secondary forming a figure 8 with the primary but it was dancing all over the place. At 286X I really had to concentrate but the secondary component would pop out for a clear split and then disappear again. I watched this for quite a while to make sure that I was seeing the two components. When the seeing calmed downed for short periods the split was certain but the movement of the air put the secondary in constant movement. It would have been dificult to measure the positional angle on this night of fair to good seeing. This double needs a night of very steady seeing. |
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| William L. Schart | ||||
| Star:
42
Orionis
Date & Time: 2/24/01 10:10 pm CST Seeing: 6 <1-10 Seeing Scale (10 best)> Location of site: Killeen, TX (Lat 31 N, Elev 600 ft) Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Telescope: Celestar 8” SCT Magnification: 78x, 120x, 203x |
I couldn’t
crack this nut tonight - seeing isn’t good enough.
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