| William L. Schart | ||||
| Star:
31 Orionis
Date & Time: November, 11th, 1998 - 12:18 am 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 <Limiting magnitude> Telescope: Orion 6" Dob. Magnification: 48x, 72x, 120x Star: 31 Orionis
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From eta Ori,
I hopped to a distinctive 5-star asterism shaped much like the 5-spot on
a die. From there, it was a short hop to 31 Ori. This is a bright orange
with a faint secondary. At 120x was barely to split
this, or perhaps it was just an elongation?
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| Craig M. Carver | ||||
| Star:
31 Ori
Date & Time: 11/22/98 0600 UT Seeing: 5 <1-10 Seeing Scale (10 best)> Location of site: Madison, WI (Lat 43.07, Long 89.38, Elev. 500 ft) Site classification: Suburban Sky darkness: 4.3-4.5 <Limiting magnitude> Telescope: 6" Maksutov Magnification: 95x, 190x, 257x |
31 Ori is a cream orange
color with a faint blue companion first seen at 190x but best split with
7mm eyepiece (257x).
Other comments: From my backyard
site in the rural-suburbs at best I can see naked-eye down to about mag
5.3. I used 31 Ori (mag 4.7) to estimate
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| Chuck Layton | ||||
| Star:
31 Ori
Date & Time: Dec.20, 1998, 07:15 UT Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: Tacoma (WA) Site classification: --- Sky darkness: 4.4 <Limiting magnitude> Telescope: 20cm f/6 Eq. Newtonian Magnification: 122x |
Observed Colorations
of Components: A - deep orange, B - white. Other comments:
Beautiful easy pair with a magnificent deep orange primary!
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| Dave Mitsky | ||||
| Star:
31 Orionis
Date & Time: 1/30/99 06:03 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 |
Having a separation of 12.7" this fine stellar pair was resolved at 118x and is comprised of a 6th magnitude yellow-orange primary and a dim blue-colored 14 magnitude star. | |||
| Paolo Morini | ||||
| Star:
31 Orionis
Date & Time: 6th Dec 1999 , 22 UTC Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: San Romualdo, a little village in the country near Ravenna – Italy. Site classification: Rural Sky darkness: 5.5 <Limiting magnitude> Temperature -0.5 Telescope: Takahashi FS102 Magnification: 164x + Amici prism |
Main component
orange, second component visible only with averted vision.
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| Ilario Melandri | ||||
| Star:
31
Orionis
Date & Time: Seeing: 4 <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: 5.5 <Limiting magnitude> Temperature: -0.5C Telescope: 150 mm f/15 achromatic refractor Magnification: 140 x (eyepiece Plossl Clavé 16 mm) |
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| David Bushard | ||||
| Star:
31 Orionis
Location of site: River Falls, WI (USA) longitude 92, latitude 45N elevation approx 800 ft (246 m) Date of observations: 29 Dec 1999, 8:00 to 11:00 pm local time (CST) Site classification: rural Sky conditions: Seeing: 6 of 10, improving later transparency: 6 of 10 limiting visual magnitude: 5.2 Temperature: 25 F (-3 C), winds light and variable Telescope: Meade 12" LX-200 EC Eyepiece: Televue 13mm Nagler (234x) |
Easily resolved.
A is golden orange, B is probably white, and seems
fainter than the 10.2 mag shown by WDS.
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| Randall Heckman | ||||
| Star:
31 Orionis
Date & Time: 12/29/99 at 2:42 UT Seeing: 4 Location of Site: Heckman Observatory 40 37' 10" N and 99 03' 50" W Site Classification: Rural Sky Darkness (Limiting Magnitude): 5.5 Telescope: 8" Orion Dob with 6" aperture mask Magnification: 71x |
Separation (Clear or Toughing):
Clear
Magnitude Comment: Secondary much dimmer. Color Comment: Primary seemed to be orange. General Comment: Very easy to find near Delta Ori. I liked the color of the primary.
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| Richard Harshaw | ||||
| Star:
31 Orionis [STF 725; CI Ori; ADS 4097; SAO 132176]
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): 0130 of 12-30-99 Site classification: suburban Sky conditions: seeing-- 6 out of 10 transparency-- 8 out of 10 limiting visual magnitude—5 Temperature: 46 F, slight breeze Telescope: Celestron C-8 Eyepiece: Celestron Micro-Guide (160x) |
Measurements
of 1933:
4.7m (K4III) primary 9.9m (F7) companion at 12" in PA 87 Both separation and PA appear to be fixed I made five pairs of separation and PA measures using the Micro-Guide and got an average of 14.7" in PA 87. I'll chalk the overstated separation up to slightly turbulent seeing which made the stars's images rather bloated and floating. I noted colors of deep Orange and blue (??). The companion was very difficult to measure with the Micro-Guide, even on its lowest LED setting. This pair is probably about 456 light years away, making it 220 times as bright as the Sun. Star A is a spectroscopic binary and an infra-red source.
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| Richard Bise | ||||
| Star:31
Orionis
Date & Time: January/7,8/2000 Seeing: 5 <1-10 Seeing Scale (10 best)> Location of site: 20 NW of Tucson Az 32.884N -110.979W Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Telescope: 10 inch Meade Dobsonian Magnification: 49x, 125x (25mm Meade and 9.7mm Plössls) |
At 49x, 31 was unresolved
but at 125x the blue companion was seen.
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| Tomás Vazquez | ||||
| Star:
31 Orionis
Date & Time: 12/01/2000, (TU): 21:13:35 Seeing: 4 <1-10 Seeing Scale (10 best)> Location of site: 37 24 N. 5 58 W. Sevilla, Spain Site classification: Urban Sky darkness: 3 <Limiting magnitude> Telescope: Celestron C8” D:203mm. f/6,3 Magnification: CCD Camera
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Observing Method: CCD ST-4
Camera
Integration time: 10 seconds Software used (reading/treatment): Lucas 1.1 / Laia 3.1g Image Position: North up, East left This is a bit difficult to
split double. In the image, you can observe how the B component is almost
eclipsed because the bright of the 4.7 magnitude main component. The secondary,
with magnitude 9.9 is located 12.7” with a PA of 87º. Component A
is a spectroscopic binary, from spectral class K5.
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| Bill Becker | ||||
| Star:
31 Orionis
Location of site: Casper, Wyoming Elev. 5200' Date of observations: Jan 15th 5:05 UT Site classification: Suburban Seeing: 5 Limiting manitude: 4.5 Telescope: Quantum 4 Maksutov Magnification: 170x |
Finally split
this one. Winds weren't quite as strong as on other nights. With the 9mm
pentax at 170x, primary seen as yellowish with companion seen only with
averted vision during steadiest moments.
With the 1.75x barlow, during
these steady moments, the companion was seen with direct vision. No color
noted for this faint one, just glad I finally saw it.(the first instance
that I saw it I estimated pa as 90* so when I looked up stats and saw pa
listed as 87*, I let out a fairly loud YES.
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| John M. Ryan | ||||
| Star:
31
Orionis
Date of Observation: 24/1/00 22:20UT Location of Observation: Ciudad Rodrigo, Salamanca, Spain 40º 36' N, 6º 32'W, Elev. 800 Meters Seeing: 5 (1 - 10, 10 best) Site classification: Urban Limiting Mag. (naked eye): 4 Instrument: TeleVue 101 Apo refractor Magnification: 30x and 60x |
Separation (Clear or Touching):Clear,
clean split
Magnitude Comment:Primary much brighter than secondary by 4 or 5 mags. Color Comment: Both seemed to be pale orange General Comment: After splitting Eta Ori this was much easier knowing what to look for. The separation is greater than Eta but the secondary is much dimmer. Both components seemed like two small tangerines dancing across the sky. Very beautiful and delicate. It was a pleasure to observe them. The spec. from Sky Catlog 2000 (Vol 2) shows the primary as a class K5 which would tend toward the red if I am not mistaken.
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| Jim Brownfield | ||||
| Star:
31
Orionis
Date & Time: 26/01/2000, 6:30 p.m.- 11:30 p.m. EST Seeing: 3 – 5 (improving) <1-10 Seeing Scale (10 best)>. Location of site: Huntsburg, Ohio, USA Site classification: Suburban Sky darkness: 6 mag., could see ST 855, going to 5th mag. star Rho <Limiting magnitude> Other observing conditions: 83% humidity, 16 degrees F. with 12" snow on ground going to 84% humidity, 4 degrees F. Telescope: 13.1"/F4.5 Dobsonian, with 5" aperture mask for the brighter pairs Magnification: 47x |
split at 47x, bright red primary | |||
| Jay Zimmerman | ||||
| Star:
31 Orionis
Date & Time: 03/06/00, 0345 UT Seeing: 6 <1-10 Seeing Scale (10 best)> Location of Site: Carbondale, IL, USA Site classification: Suburban/ near rural Temperature: 37°F (2.8°C) Sky darkness: 5.9 <Limiting magnitude>t Telescope: 94mm, f7 apo Magnification: 128x |
Another dim
secondary (of a wide pair) chivvied out of its burrow by the 12mm + barlow
on a transparent night. Colors: A = orange; B = gray-blue.
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| John Clemmer | ||||
| Star:
31 Orionis
Date & Time: Feb 27/2000 2000 EST Seeing: 8, quite good <1-10 Seeing Scale (10 best)> Location of site: Priceville, Ontario, Canada W80 41'41" N44 10' 40" Site classification: Rural Sky darkness: 7/10ths lowest vis. magnitude around 6.1 seen in Orion <Limiting magnitude> Telescope: 4.5" f26 Kutter Schiefspiegler Magnification: 108x (17mm eyepiece)
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faint w/ 17mm 108x | |||
| G.E.O.D.A Group | ||||
| Star:
31 Orionis
Date & Time: 8-III-2000, 19:00-21:00UT Seeing: 6.5 <1-10 Seeing Scale (10 best)> Location of Site: Manises, Valencia, Spain. GPS coordinates: 39º 29' 36" N, 00º 27' 56" W. Site Classification: Urban-Suburban Sky darkness: 4 <Limiting magnitude> Telescope: Meade 10" LX-200 SCT Magnification: 200x |
Published measures
are the mean of two observations made from two different observers.
d = 14.2; PA = 81
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