Struve 2474 

Jim Jones
Star: Struve 2474 
Date & Time:  07/05/01 0600 UTC
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Location of site: Lake Oswego, Oregon
Site classification: Suburban
Sky darkness: 5.0 in Lyra <Limiting magnitude>
Sky: Full Moon very bright sky
Telescope: 8 inch LX50 SCT 
Eyepieces:  18mm Radian 
Magnification: 112x 
 

Star: Struve 2474
Date & Time: 2nd, August, 2001
Seeing: -- <1-10 Seeing Scale (10 best)>. 
Location of site: Lake Oswego, Oregon 
Site classification: Suburban
Sky darkness: --- <Limiting magnitude>
Telescope: 8 inch LX50 SCT 
Eyepieces:  Connectix B&W Web Cam. 
Magnification: --
 

 Est PA without inst 260d 
Primary appeared blue-white 
Secondary appeared blue 
Actual spectral class is G1, G5. 
The second pair the "second" double-double 
in Lyra.  Together with STF 2470 makes an 
excellent view. 
 
 
 
 
 
 
 
 
 

Here I measured
a separation of 16.25" and a standard deviation of  0.11".  The published
separation is 16.2".
 
 


 

 
Richard Harshaw 
Star: Struve 2474 
Date & Time: 6 July, 2001, 03:00 to 04:55, UT
Seeing: 8 <1-10 Seeing Scale (10 best)>. 
Transparency: 6-7/10 ,variable, due to high hazy clouds 
Location of site: Northern Kansas City, Missouri. 39º 15' N, 94º 30' W, 980 ft above Mean Sea Level
Site classification: Suburban
Sky darkness:  <Limiting magnitude>
Telescope: Celestron C-11
Eyepieces: 25mm Plossl 
Magnification: 112x		 Position:  1909+3436 
Magnitudes:  6.74 (G1 V), 7.97 (G5 V) 
Sep/PA's:   16- / 263+ 
Year of this measurement:  1996 
Distance (light years):  160 
Luminosity (in suns):  5.5 
Eyepiece and magnification:  25mm Plossl (112x) 
Colors noted:  Y!, W 

Comments:  A nice color of yellow in A.  B's color I am not so certain.  Webb saw them as yW and W.  Franks saw B for the companion. 
First measure (1821) by F. W. Struve:  17.3" @ 259. 
The stars share a large common proper motion. 
Rating:  1 
 

 
Bob Hogeveen
Star: Struve 2474 
Date & Time: July 8, 2001; 0:30 - 01.15 
Seeing: 6 <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>
Telescope: Meade SCT 8" f/10 
Eyepieces: Ultima 30 mm, TV plossl 20mm, LV 15mm, LV 7mm 
Magnification: 67x, 133x		 Together with STF2470 another double-double in Lyra. Nice view when both doubles are in 1 FOV. With a mutual distance of 10' both doubles are in the same FOV even with 133x. An excellent view of this double pair is given with the 30mm EP (67x). The field is rich and the different colors show nicely. Star A of STF2474 is the most striking of this field, it shows a nice yellow color. 
Rating: 2 

 
William Schart 
Star: Struve 2474 
Date & Time: July/9/01 0500 to 0635 UT
Seeing: 7 <1-10 Seeing Scale (10 best)>. 
Location of site: Killeen, TX, USA
Site classification: Suburban
Sky darkness: 4 <Limiting magnitude>
Temperature: In the 80's F (30's C). Slight breeze. 
Telescope: Celestar 8" SCT
Eyepieces:  25mm, 17mm, 10mm 
Magnification: 80x, 120x, 200x
 

Star: Struve 2474
Date & Time: August 4, 2001, 9:25 to 10:12 pm CDT
Seeing: 7 <1-10 Seeing Scale (10 best)>
Location of site: Killeen, TX, USA
Site classification: 
Sky darkness: 3.5 <Limiting magnitude> 
Temperature: 89ºF (32ºC). 
Telescope: Celestar 8" SCT 
Eyepieces: 12.5 Microguide EP 
Magnification: 160x
 

 The other "double double" in Lyra. These are 2 very similar appearing pairs and visible in the same FOV. They are not quite parallel and the comapnions are both on the same side of the primary. 2470 is more blue to me. 2474 I see as blue for the primary and yellow for the secondary. 
 
 
 
 
 
 
 
 
 
 
 

Sep: 16.9, PA 363.9 (ave 5 meas)
 

 
Mary Flanagan
Star: Struve 2474 
Date & Time: 11 Jul 2001 04:09 UT
Seeing: 6 <1-10 Seeing Scale (10 best)>. 
Transparency: 9/10 
Location of site: Apple Valley MN, USA
93d 14m 25s W; 44d 45m 17s N
Site classification: Suburban
Sky darkness: ~4.5 <Limiting magnitude>
Telescope: 12.5" f/5 Dobsonian 
Magnification: 50x		 See STF 2470. Both in same field.

 
Tim Leese
Star: Struve 2474
Date & Time: 16 July 2001 ( 00:40 UT ).
Seeing: 7 <1-10 Seeing Scale (10 best)>. 
Location of site: Northwich, Cheshire. UK. 53° 15' N -2º 33' W. 
Site classification: Suburban
Conditions: Clear spell, cool, no Moon.
Sky darkness: 4.2 ( UMi ) <Limiting magnitude>
Telescope: 200mm f/6  Newtonian reflector. Mounted over a Vixen GP mount (manual slow motion).
Eyepieces:   18mm and 9mm orthoscopics
Magnification:  X67, X134		 Using an orthoscopic eyepiece at X67 revealed a  nice view of 4 stars very similar  to the more famous "double double" surrounded by fainter stars in the same field of view. This pair are more widely separated than Epsilon making them slightly harder to find in the finder scope but once I had them in view the stars were easy to separate into their components. At X67 the more  southerly pair( STF 2474 ) appeared to my eye as having a very pale yellow colour with the other pair( STF 2470 ) appearing white.

I could only just get the four stars in the same fov using X134 but the colour contrast seemed more apparent. At this magnification STF 2470 appeared to be white with a blue/white companion. STF 2474 appeared to be pale yellow with a yellow orange companion.  Two very pretty double stars in the same low power field of view.
 

 
Bill Reinehr 
Star: Struve 2474
Date & Time: July 18, 2001 03:30  UTC
Seeing: 8 <1-10 Seeing Scale (10 best)>.
Location of site: Pflugerville, Texas, USA (30 degrees N.)
Site classification: Suburban
Sky darkness: 4.2 <Limiting magnitude>
Temperature: 82º F. 
Telescope: Vixen 80mm Fluorite, f/8  on Custom D altaz mount
Magnification: 26x & 46x. (25mm Ultrascopic & 14mm Orion LV)
: 		 Same observation as for STF 2470 as they are extremely close to one another - even at high power.
 
 
 
 
 
 
 

 

 
Luis Argüelles
Star: Struve 2474
Date & Time: 21st, July, 2001. 21:00 – 23:05UT
Seeing: 7-8 <1-10 Seeing Scale (10 best)>
Transparency: 3-4 <0:worst -10:best >
Location of site: Quintueles, Gijón, Spain.  43º 32N, 5º 55W. Altitude: 20 m.
Site classification: Suburban
Sky darkness: 3.0 - 3.5 <Limiting magnitude> 
Temperature: about 15º C
Conditions: A lot of haze and moisture. Seeing is rather good, but haze actuates like a light diffusor and that makes difficult observe stars fainter that 10
magnitude.
Humidity: about 90%
Telescope: Vixen 102 4" achromatic refractor
Eyepieces: 35, 10 and 5mm Baader-Planetarium Eudiascopics
Magnification: 100x
Harschaw Scale: 3 <From 1 to 5. 1 = Great, 5 = poor interest>		 This double is very easy to split at 100x. After splitting some "uncomfortable" doubles in Lyra, this one is almost child's play. The difference of magnitude is evident, although I'm unable to perceive coloration.

 
Stuart Clough
Star: Struve 2474
Date & Time: 27.07.01. 2135 UT
Seeing: 7 <1-10 Seeing Scale (10 best)>. 
Location of site: Near Halifax
West Yorkshire, England.
Site classification: Suburban
Sky darkness: 4.4 (U Mi) <Limiting magnitude> 
Temperature: 22 C
Conditions: No cloud, Lt. Airs, balmy.
Telescope: Orion Optics UK GX250
10"  f4.8 Newtonian on Vixen GP mount.
Eyepieces: 20 mm Plossl, 25 mm Ortho, Ultima Barlow.
Magnification: x60, x 96		 Easily split. See report for STF 2470.

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