| Craig M. Carver | ||||
| Star:
Iota Orionis
Date & Time: 11/22/98 0630 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 |
A fine triple: A bright,
very pale blue or white primary with a bluish mag 7 companion nearby and
mag 11 star four times further away, all seen at 95x (19mm
eyepiece). I thought I saw a hint of the involved nebula NGC1980. |
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| William L. Schart | ||||
| Star:
Iota Orionis
Date & Time: November, 26th, 1998 - 10:30 pm CST Seeing: 8 <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: 32x, 48x, 120x Star: Iota Orionis Date & Time: 1/12/00 8:50 pm CST Seeing: 8 <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, 98x |
Located near
to the theta/M42 system, next to a Y-shaped asterism of 4 stars. Easily
split at any power. White color.
The last star in the “sword” is a triple system. At 48x without any additional aid I could detect a wide spaced but faint third star. With the aid of an hexagonal objective mask I could detect the second, brighter but close star. Both were visible at 72x without any aid. The primary is a bright white to whitish-yellow, the close companion seemed blue in comparison. The third was too faint to
tell color.
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| Paolo Morini | ||||
| Star:
Iota Orionis
Date & Time: 07 Dec 1998, approx 22 UTC Seeing: 8 <1-10 Seeing Scale (10 best)> Location of site: San Romualdo, a little village in the country near Ravenna – Italy. Site classification: Suburban Sky darkness: 5 <Limiting magnitude> Telescope: Takahashi FS102 Magnification: 164x (LE5 eyepiece) Star: Iota Orionis Date & Time: 06 Dec 1999 Seeing: 5 <1-10 Seeing Scale (10 best)> Location of site: San Romualdo, a little village in the country near Ravenna – Italy. Site classification: Suburban Sky darkness: 5 <Limiting magnitude> Telescope: Takahashi FS102 Magnification: 164x (LE5 eyepiece) |
Very fine triple
system – the components A and B form a beautiful pair. No coloration was
registered.
The third component of m 11 seemed to me brighter than this magnitude, perhaps between 9 and 10. In the same evening I wasn’t able to see the second component of Otto Struve 111, of magnitude 10. And about Otto Struve 111,
I didn’t see the fainter star last year, nor was
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| Chuck Layton | ||||
| Star:
Iota Orionis
Date of Observation: Jan. 11, 1999 Time of Observation: 0545 UT Seeing (1 - 10, 10 best): 5 Site classification: Suburban Limiting Mag. (naked eye): 4.8 Instrument: 20cm f/6 Eq. Newtonian Magnification: 177X |
Observed Colorations of
Components: All components appear white.
Other comments: Spectacular field! Very bright primary and close mag. 7 B component. A fainter C component lies a short distance to the E. Pleasing arrangement. |
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| Dave Mitsky | ||||
| Star:
Iota Orionis
Date & Time: 2/4/99 02:38 UT Seeing: 6 <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 |
A glorious triple that was split with no difficulty at 118x. The 3rd magnitude primary looked to be white as did the widely separated (49.7") 11th magnitude component. The nearer (11.4") and brighter 7th magnitude component was a definite blue. | |||
| Orlon Petterson, Marilyn Head, Giles Reid and David Downing | ||||
| Star:
Iota Orionis
Date & Time: 13/02/99, 10:00UT to 14:00 UT Seeing: 7-8 got better as night progressed Sky darkness: 6 - 6.5 <Limiting magnitude> Again didn't actually make a definitive measure but the sky was dark and the transparency really good. Location: Staveley, ~80km SW of Christchurch, New Zealand. Instrument: 102mm f/9.8 refractor Magnification: 50x |
Spotted the companion at 50x to the SE of the primary. There were a number of field stars to the SW and W which could have been where the companion is, I have still to sort out image scales for my scope but it was asterism of stars. | |||
| Ilario Melandri | ||||
| Star:
Iota
Orionis
Date & Time: 6/Dec/1999 – 22.28 UTC 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 <Limiting magnitude> Temperature: +0.5C Telescope: 150 mm f/15 achromatic refractor Magnification: 140 x (eyepiece Plossl Clavé 16 mm) |
 |
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| Randall Heckman | ||||
| Star:
Iota Orionis
Date & Time: 12/29/99 at 3:30 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: 46x |
Separation (Clear or Toughing):
Clear
Magnitude Comment: Dimness of secondaries consistent with quoted values. Color Comment: White. General Comment: Easy to find.
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| Richard Harshaw | ||||
| Star:
Iota Orionis [Nair al Saif; 44 Ori; STF 752; ADS 4193; SAO 132323]
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): 02:05 of 12-30-99 Site classification: suburban Sky conditions: seeing-- 6 out of 10 transparency-- 8 out of 10 limiting visual magnitude—5 Temperature: 44 F, light breeze Telescope: Celestron C-8 Eyepiece: Celestron Micro-Guide (160x) |
I made five
pairs of separation and PA measures using the Micro-Guide and got averages
of AB 12.2" in PA 141 and AC 51" in PA 104.
This is another fantastic field and a beautiful pair. I noted colors of white for all three stars, but the C star was very difficult to pick up tonight. The system is about 1,330 light years away, making it about 11,000 times as bright as the Sun. It was first measured by F. Struve in 1831. The AB pair is at least 6,500 AU apart. Star A is a spectroscopic binary with a 29.1351 day highly-eccentric orbit. The A star is weak in helium by a factor of 10 relative to other stars. It also rotates at a fairly hefty 130 km/sec at the equator and is an infra-red source. It is ejecting mass to its companion at the velocity of 1,600 km/sec. Iota is a member of the Orion OB1 Association. Measurements of 1986:
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| Tomás Vazquez | ||||
| Star:
Iota Orionis
Date & Time: 4/1/2000, 20:50:04 TU 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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Observation method: CCD
Camera.
Integration time: 4 seconds Reading CCD software: LUCAS 1.1 Treatment software: LAIA 3.1g Image Position: North up, East left. An easy double to split. In the image you can appreciate the main component at 2.8 magnitude, while the secondary shines at 6.9 located 11.3” away with a PA of 141 degrees. Both components are giant blue, being the main component a spectroscopic binary with a period of 29.1 days.
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| Bill Becker | ||||
| Star:
Iota Orionis
Location of site: Casper, Wyoming Elev. 5200' Date of observations: Jan.6,2000 5:35UT Site classification: --- Sky conditions: Seeing: 4 Transp.: 4.5 Telescope: Quantum 4 Maksutov Magnification: 85x & 149x |
Primary &
companion nice and close at 11"
Magnitude difference no problem at 85x; faint companion of 11th mag. seen using averted vision at 85x, direct viewing at 149x. This gave me the idea to try 31 Ori again but could not split it again. I'll have to wait for really steady seeing as the relatively close separation of about 12" and large 5 magnitude difference makes this one tough for me. Perhaps I'll try again with my 7" Mak
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| Richard Bise | ||||
| Star:
Iota
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) |
I got good separation of
the primary and both companions at 49X. Colors seemed to be white, orange
and blue/grey at 49X.. At 125X, the "watery" atmosphere washed out the
colors.
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| Penny Fisher | ||||
| Star:
Iota
Orionis
Date & Time: January 10th, 2000. About 9 p.m. ET (local time) Seeing: 6 <1-10 Seeing Scale (10 best)> Location of site: Englishtown NJ, 40.25 N 74.333 W Site classification: Suburban Sky darkness: Dark, no moon Telescope: 8 inch Dob Magnification: 80x (8 inch Orion Dob-Newt with 15mm Televue Plossl eyepiece)
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The seeing
tonight was very poor. It was very cold out (a balmy 10 degrees Farenheit!).
Upper winds made seeing poor, combined with a short cool-down period for
my scope and moisture which threated to ice up the optics.
I revisted Iota Orionis.
I did not detect the orange component perhaps because the conditions made
everything look muddy. However, the primary star, and it's secondary,
looked beautiful despite the bad conditions. Iota itself was a beautiful
sparkly blue and it's component was a fainter blue but a definite blue.
This was a very easy to split double.
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| Orlon Petterson | ||||
| Star:
Iota
Orionis
Date & Time: 10:00 - 12:00 UT 20/01/2000 Seeing: 3 <1-10 Seeing Scale (10 best)> Location of site: Christchurch, New Zealand Site classification: Suburban Sky darkness: 5 <Limiting magnitude> Telescope: C102HD f/10 refractor Magnification: 50x, 83x |
Clear night
with a warm light NW breeze, near Full Moon, but with seeing like looking
up from the bottom of a swimming pool. Secondary seen to the SE of
bright white primary. Tertiary seen only very faintly at 50x to the
E of primary.
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| Philippe de Jocas | ||||
| Star:
Iota
Orionis
Date & Time: January 22, 1h00-7h300 UT Seeing: 3-4 <1-10 Seeing Scale (10 best)>. Location of site: Ottawa/Hull, Canada Site classification: Suburban Sky darkness: 4.5 <Limiting magnitude> Temperature: -25C Telescope: 6" f5 newtonian Magnification: 90x, 120x |
lota Ori was fully resolved
at 90x but with great difficulty, swithching to 120x improved the situation
somewhat, and I could then hold the companion steadily in my sight.
Struve 747 and iota Ori
together make for a very nice field at 90x (42' with my 19mm lens), being
so dominated by those hot blue /white stars. In this case the 11mag. companion
to iota Ori was no problem at all.
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| Jim Brownfield | ||||
| Star:
Iota
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 Star: Iota Orionis Date & Time: 1/29/00, 3:30 UT - 10:00 UT Seeing: ) 3 improving to 4 <1-10 Seeing Scale (10 best)>. Location of site: Huntsburg, Ohio, USA Site classification: Suburban Sky darkness: 4.5 (limiting magnitude) Other observing conditions: 14 degrees F dropping to 6 degrees F, 92% humidity Telescope: Meade 80mm/ f11 Magnification: 28x, 45x, 82x |
split at 47x
28x split the 11mag star, 45x showed 6.9 mag star as just touching, 82x clearly split the trio |
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| Daniel Rodríguez | ||||
| Star:Iota
Orionis
Date & Time: 1/30/2000, 23:20 (UT) Seeing: 5 <1-10 Seeing Scale (10 best)> Location of site: Jerez de la Frontera, SPAIN, elev. 24 m Site classification: Urban Sky darkness: 4 <Limiting magnitude> Temperature: 9C Telescope: Celestron G8 (8” SCT f/10) Magnification: 119x (Celestron Plössl 17mm)  |
To my surprise the 11th
magnitude star was easily seen, there was no need to use adverted vision.
Considering that it was impossible to have dark adaptation, due to nearby
streetlights, I think that in this case a large aperture was a great
help.
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| Bill Reinehr | ||||
| Star:
Iota
Orionis
Date & Time: February 4, 2000, 03:00 UTC Seeing: 8 <1-10 Seeing Scale (10 best)> Location of site: Pflugerville, Texas, USA (30 degrees N.) Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Temperature: 52F Telescope: Vixen 80mm Fluorite, f/8 on Custom D altaz mount Magnification: 51x, 91x, 183x, 256x |
Nice split
of the two brighter components at 51x. The mag. 11 component glimpsed with
averted vision at 91x. At 143x, the mag. 11 component was barely visible
and tended to wink in and out, however, this component was very easily
seen with averted vision.
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| Jay Zimmerman | ||||
| Star:
Iota Orionis
Date & Time: 02/06/2000, 0430 UT Seeing: 7 <1-10 Seeing Scale (10 best)> Location of Site: Carbondale, IL, USA Site Classification: Suburban/near rural Sky darkness: 5.0 <Limiting magnitude> Telescope: 97mm, f7 apo Magnification: 80x Star: Iota Orionis
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Clean split
@ 80x but much better views @ 107x and 160x. Even at high magnification
the C component (mag. 11) was very elusive. After repeated transits of
the ocular field I am reasonably confident that it winked in and out of
visibility two or three times for a split second at the correct PA
(184°). This was definitely not a good night for low-magnitude stars.
Colors: A and B = white. C not determined.
Clean split of all three components at 80x. I did not try lower power but suspect 80x to be about the practical minimum. C (mag. 11) was seen best with averted vision. C winked in and out of visibility but was there most of the time even with direct vision. Boosting the power to 160x
did not significantly improve the picture.
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| Tom Teague | ||||
| Star:
Iota
Orionis
Date & Time: 2000 February 13, 2110 UT Seeing: 7/10 (8/10 at zenith) <1-10 Seeing Scale (10 best)>. Location of site: Chester, England (53 11 08N; 02 51 39W) Site classification: Suburban Sky darkness: 4 (Moon just past first quarter) <Limiting magnitude> Telescope: 63/840 mm Zeiss Telementor refractor Magnification: x56, x112, x210 |
AB pair easy x56 (spotted
while finding Struve 747 above - same field). At this power, white
and pale lilac. x112, white and grey/colourless. Star C fleetingly
glimpsed at this power. Star C clearly seen with averted vision x210 -
not particularly difficult. At this power, Star B seems bluish.
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| Jordi Viver | ||||
| Star:
Iota Orionis
Date & Time: 19/02/2000, 09:30 UT Seeing: 6 <1-10 Seeing Scale (10 best)> Location of Site: Vic (Spain) 41º55’N, 2º19’E Elev. 570m Site Classification: Suburban Sky darkness: 4.62 <Limiting magnitude> Temperature: 7ºC Telescope: Celestron C8 Magnification: 162x, 321x |
Separation:
Easy localization and separation.
Color coment: The first component are white, the others ones are diferent colours. Catalog data: Guide 7.0: vM 2.78, 7.73, D 11.5’’, PA 142º. There are a third component not seen in the Guide 7.0 . WDS (1831) vM 4.78, 5.67 D 35.8’’ PA 223º. General coments: The data are not similar. (¿)
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| Tim Leese | ||||
| Star:
Iota
Orionis
Date & Time: 19-Feb-2000, 1900-2330 UT. Seeing: 5/6 <1-10 Seeing Scale (10 best)> Location of site: Cheshire. UK Site classification: Suburban Sky darkness: 3 <Limiting magnitude> Conditions: High haze, very cold and frosty, sky clearing later but full moon. Telescope: 200mm f/6 Newtonian scope mounted over a Vixen GP mount (manual slow motion). Magnification: x96 |
Estimated PA
141, Separation 11.6”. Observe mag 7 companion but not fainter star.
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| G.E.O.D.A Group | ||||
| Star:
Iota 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 = 12.0-55.3; PA = 142-101
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