42+45 Orion 

Jim Jones
Star: 42+45 Orion 
Date & Time: 07:25 UTC, 11/17/00 
Seeing: 6 <1-10 Seeing Scale (10 best)> 
Location of site: Lake Oswego, Oregon  
Site classification: Suburban 
Sky darkness: 3.5 <Limiting magnitude>  
Temp:  36F 
Wind:  Brisk and cold. 
Binocular: 7x50 Nikon (hand held) 
 
 
 
Est PA ..... 95d 
Primary ....Blue-white 
42 Ori is primary. 45 Ori is only slightly dimmer. 
 

 

 
 

 
 
Bob Hogeveen
Star: 42+45 Orion 
Date & Time: November 18, 2000, 00:00 MET  
Seeing: --- <1-10 Seeing Scale (10 best)> 
Location of site: Annen, The Netherlands 
(53 N, 6 E) 
Site classification: Village-backyard 
Sky darkness: 4 <Limiting magnitude>  
Conditions: Some clouds 
Temperature: 5ºC 
Binocular: Swift Supreme 10x50 (on tripod) 
 
A very wide pair which wouldn't be very interessting if they didn't sit in the beautiful starfield of Orion's Sword. 
The distance of the stars, given by the Hipparcos is 1165 ly for 42 and 473 ly for 45. If this is right then there are obvious no real double. 
We can see another star in between 42 and 45 (V359 Ori - mag. 7.3). The three of them form just an asterism I think. 

In the same FOV we see, beside the nebulous glow of M42, several other doubles : 
Theta-2, a bright and easy double in the middle of M42. 
Theta-1, The Trapezium, which cannot be separated with 10x. 
42+45 Ori, a very wide pair to the north of M42 and the most attractive one : 
Stuve 747, a nice little double near Iota Ori (south of M42). 
 

 
 
Eddy O'Connor
Star: 42+45 Orion 
Date & Time: Dec 5th 2000. 10 -11p.m local; UT +11 
Seeing: 5-6 <1-10 Seeing Scale (10 best)> 
Transparency: 6/10 
Temperature: 18ºC 
Other Conditions: Calm. Moon 9 days old 
Location of Site: Terara, New South Wales 
Australia,  S34.52, W150.38 degrees. 
Site Classification: Suburban 
Sky darkness: North 4; South 4.5 <Limiting magnitude> 
Binoculars: 7X35 Tento. 25X100 Somet. 
(Occasional 16" Dob comparisons ) 
HS: 2 
HS= Harshaw Scale1-5 (1 best) 
 
The splendid tour continues. We now jump to the Northern tip of the Sword to visit a very wide pair of mag. 4.7 and 5.3. I recorded the colours as Pearly white and Deep yellow. Comments. While not as impressive as Struve 747, the faint stars embedded in the field make a striking field, even in poor seeing. 
 

 
 

 
 
Luis Argüelles
Star: 42+45 Orion 
Date & Time: Tuesday, 9th, January, 2000, 21:15 UT 
Site of Observation: Alto del Naranco, Oviedo 
Site Clasification: Suburban 
Seeing: 2-3 <1-10 Seeing Scale (10 best)> 
Sky darkness: About 3 <Limiting magnitude> 
Transparency: 6 
Temperature: About 11ºC 
Conditions: Very strong wind (maybe about 40 km/h) 
Binoculars: Pentax PCF-V 8x40, 6.3º field. Tripod mounted. 
 
This "double-double" (in good telescopes) is really easy to locate between the complex NGC 1981 (south from) and M42-M43 (north from). Both stars appear to have the same blueish coloration and this has been the "first double-splitting light" for my new Pentax binoculars. 

Anyway, the strong wind and bad seeing makes the observation not as enjoyable as it could be. I proceed to make a quick trip in Orion visiting Betelgeuse, Meissa, Bellatrix, Rigel, Saiph, Alnitak, Alnilam and Mintaka (all the belt in the same glorious field of view), Sigma, again 42+45 and Theta1, Theta2, but I can't make more splittings due to the bad seeing. Even Mintaka was imposible to split. 
 

 
 
Stuart Anderson
Star: 42+45 Orion 
Date & Time: UT 11th Jan 2001 18:00 
Seeing: 4 <1-10 Seeing Scale (10 best)>. 
Location of site: Hamburg, Germany 
Lat/Long: 53 34 N, 9 59 E 
Site classification: Suburban sky 
Sky darkness: -- <Limiting magnitude> 
Binoculars: Vixen Ultima 9x63 + tripod 
FOV: 5d 
 
Easy to locate, directly beneath NGC1981 in the binocular FOV. Distinctive shape of NGC1981's prominent stars gives 42 and 45 Ori away. Wide separation of 42 and 45, with 42 being slightly more yellowish in colour than 45, and somewhat brighter. 
 
A third, much fainter, star was visible forming a small triange with 45 and 42. This star is V359 Ori (SMP mag. 7.3). Local conditions can be sensed by the fact that about 8 stars in NGC1981 could be seen. 42 and 45 Ori were rather low in the sky during this observation (17 degrees) - perhaps more stars in NGC1981 would be visible later in the evening. 
 
Estimated PA 90 degrees. 

 

 
 
Thad Robosson
Star: 42+45 Orion 
Date & Time: 1-17-01, 3:30 - 5:30 UT
Seeing: 4~5 <1-10 Seeing Scale (10 best)>
Weather: clear, but quite chilly at 45°F
(Hey, it's cold to us....)
Location of Site: Phoenix, AZ
112 08.029w, 33 32.674n
Site Classification: Suburban 
Sky darkness: -- <Limiting magnitude> 
Transparency: 3~4/10
Binoculars: 10x50 on homemade bino mount.
Appox. PA of 100°.  There is a 7.5 mag star just north of being in between these two.
 

 
 
 
 
 

  

Paolo Morini

Star:42+45 Ori
Date & Time: Jan 10, 2006, 21:00 UTC 
Seeing: --
Location of site: home, Ravenna, Italy
Site classification: Urban backyard 
Sky darkness: 3.5 <Limiting magnitude> 
Conditions:--
Temperature: 2° C
Binocular: Miyauchi 30x77

Very nice, Moon brightness