| Craig M. Carver | ||||
| Star:
Struve 848
Date & Time: 11/24/98 0640 UT Seeing: 6-7 <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: 4.8-5.0 <Limiting magnitude> Telescope: 6" Maksutov Magnification: 95x, 190x |
This multiple star is in NGC2169, a small relatively compact open cluster which appears to have two sub-groupings. The western subgroup has more stars and contains Struve 848. All five stars are pale blue. The relatively good seeing allows me to split the close (2.6") pair, something I couldn't do the previous night at the same location, using 95x. The higher power (190x) is not an improvement. | |||
| Dominik Elsässer | ||||
| Star:
Struve 848
Date: 06.Jan.1998, 19.45-20.50 UT Seeing: 8 Sky Darkness: 5.5 Location: Kleinkahl, Germany Site Classification: Rural Telescope: Vixen 102M Magnification: 100x-250x |
This multiple star is the
"heart" of the small open cluster NGC 2169. Locating this cluster is not
too difficult, it lies on a line drawn from Alnitak to Betelgeuse, again
around half the distance between this two stars northeast of Betelgeuse.
It forms a small triangle with two mag. 4.5 stars.
The Struve 848 group consists
of slightly blue stars around magnitude 8 and dimmer, and its main stars
resemble a roughly triangular shape. All three brighter (mag. 8-9) members
mentioned in the "33" list could be resolved quite nicely, including the
close (~2.5") pair, which was nearly cleanly split at 250x. However, I
missed the mag. 12 component, probably due to the glare of the brighter
stars with the help of a less-than-perfect transparency of the atmosphere
at this evening.
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| Chuck Layton | ||||
| Star:
Struve 848
Date of Observation: Jan. 11, 1999 Time of Observation: 0710 UT Seeing (1 - 10, 10 best): 5 Site classification: Suburban Limiting Mag. (naked eye): 4.8 Instrument Used: 20cm f/6 Eq. Newtonian Magnifications Used: 177X |
Observed Colorations of
Components: All 5 components appear white.
Other comments: One of my favorites! This amazingly angular arrangement of 5 stars lies within NGC 2169, a small open cluster. Very pretty field. All 5 components easily seen. |
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| Dave Mitsky | ||||
| Star:
Struve 848
Date & Time: 1/30/99 06:35 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, 259x |
This five star system is the northwestern part of the "3" of the delightful "37" cluster, NGC 2169. The 7th magnitude B2 primary has a close 8th magnitude companion. Farther to the east lies another 8th magnitude luminary while a 9th magnitude star is to the south of the A star. The system is completed by a faint western companion shining dimly at 12th magnitude. | |||
| Ilario Melandri | ||||
| Star:
Struve 848
Date & Time: 6/Dec/1999 19.16 UTC Seeing: 5 <1-10 Seeing Scale (10 best)> Location of site: Italy, Ravenna, San Romualdo, Lat 44 32N Lon 12 08E 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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| Richard Harshaw | ||||
| Star:
Struve 848 [ADS 4728]
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): 0300 on 12/31/99 Site classification: suburban Sky conditions: seeing-- 7 out of 10 transparency-- 8 out of 10 limiting visual magnitude-- 5 Temperature: 43 F Telescope: Celestron C-8 Eyepiece: Micro-Guide (160x) |
I made five
sets of measurements with the Micro-Guide illuminated reticule eyepiece
only for the AD and AE pairs and got averages of 28" at PA 119 and 44"
at PA 182. (If you want the measurements themselves, reply to this posting.)
I noted colors of White for all the stars except C which was too faint to say for certain. The field here is awesome! It is the open cluster NGC 2169, which to me has always resembled a shopping cart. This pair sits in the spot occupied by a child mother takes to market with her. This system is believed to be about 1,220 light years away, which would make it as bright as 273 Suns. Differences in distance per Hipparcos; may be an optical pair. Measurements from 1952:
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| Thad Robosson | ||||
| Star:
Struve 848
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: 60x, 87x
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60x 3
comp seen and 4th suspected/notched. 4th Easily
visible at 87x.
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| Randall Heckman | ||||
| Star:
Struve 848
Date & Time: 01/08/00 AT 2:08 UT Seeing: 5 Location of Site: Heckman Observatory 40 37' 10" N and 99 03' 50" W Site Classification: Rural Sky Darkness (Limiting Magnitude): 4.5 Telescope: 8" Orion Dob with 6 aperture mask Magnification: 120x |
Separation (Clear or Toughing):
Clear
Magnitude Comment: The mag. 12.5 component was a stretch for my averted vision. Actually, I identified the close component with the aperture mask, and I took off the aperture mask to see the mag. 12.5 component. Color Comment: White General Comment: Position angles were very important to identification. I am curious how this system was identified as a multiple star in the crowded environment to which it belongs.
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| Philippe de Jocas | ||||
| Star:
Struve 848
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, 260x |
Burnham describes it as "in cluster NGC 2169", for myself I said that it was a cluster onto itself. I got everyone oft the group at 260x; the Seeing may not have been good, but the transparency was there, as I could see the 12.5 mag. star at 90x, knowing where to look. | |||
| Jordi Viver | ||||
| Star:
Struve 848
Date & Time: 24/01/2000, 24:00 UT Seeing: 7 <1-10 Seeing Scale (10 best)> Location of Site: Vic (Spain) 41º55N, 2º19E Elev. 570m Site Classification: Suburban Sky darkness: 4.62 <Limiting magnitude> Temperature: -3ºC Telescope: 200mm self-made Newton, Dobsonian Magnification: 48x |
Separation:
I separe four components.
Color coments: All are white color. Catalog data: Guide 7.0: vM 7.2,8.55, 8.8, 9.88, D(A-B)28.5, D(A-C)43, D(A-D)1.36, PA(A-B)121.6º, PA(A-C)183º, PA(A-D)113.6º General coments: Easy localization. There is one star at 2.5
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| Jim Brownfield | ||||
| Star:
Struve 848
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: 75x Star: Struve 848
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split all at 75x, nice grouping
similar to Burnham 1 in Cassiopeia
clearly split 3 stars at 28x, no attempt was made to resolve 12.5 mag star |
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| Richard Bise | ||||
| Star:
Struve 848
Date & Time: January/29/2000, 8:30 to 10 PM MST Seeing: 6-7 <1-10 Seeing Scale (10 best)> Location of site: 20 miles 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), 149x |
The field looks cluster
like. Without the PA's an observer would be lost! At 49X, I saw a
triple star composed of : "A" as the 2.5 seconds separated A,B unresolved,
"B" as 9.1 Magnitude C and "C" as the 9.7 Magnitude D. At 149X I was able
to spot the 12.1 Magnitude member.
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| John M. Ryan | ||||
| Star:
Struve 848
Date of Observation: 30/01/00 22:20UT Location of Observation: Ciudad Rodrigo, Salamanca, Spain 40º 36' N, 6º 32'W, Elev. 800 Meters Seeing: 7 to 8. Best so far this new year based on the Luis Arguelles method (0 - 10, 10 best) Site classification: Urban Limiting Mag. (naked eye): 5 Instrument: Meade 8"SCT Magnification: 80x, 167x |
Separation (Clear or Touching):Clean
Split
Magnitude Comment:Various magnitudes in accordance with the data. Color Comment: All tend to be white General Comment:Best of the night. This is part of the NGC 2169 open cluster based on Uranometria Vol.1. The open cluster looks like an Egiptian word symbol. Easy spit and very beautiful. Based on the data the Stuve 848 is a sub group of five various magnitude stars in the form of an arrowhead. An observation like this makes the cold a lot more bearable. |
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| William L. Schart | ||||
| Star:
Struve 848
Date & Time: 2/13/00 9:20 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: Orion 6" Dob. Magnification: 32x, 48x, 72x, 98x |
At 32x forms
a fairly tight Y-shaped group of four stars. The mag 12.5 component is
not visible. Working up the powers, I thought I could see it at 72x. Separations:
A to the junction of the Y: 30; A to the other top of the Y, 40; A to
the bottom of the Y, about 80. I did not attempt any PA measurements tonight.
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| Bill Reinehr | ||||
| Star:
Struve 848
Date & Time: February 14, 2000, 03:30 UTC Seeing: 8 (very still) <1-10 Seeing Scale (10 best)> Location of site: Pflugerville, Texas, USA (30 degrees N.) Site classification: Suburban Sky darkness: 4 <Limiting magnitude> Temperature: 57 F Telescope: Vixen 80mm Fluorite, f/8 on Custom D altaz mount Magnification: 29x,91x, 183x |
Quite a nice
field. Much easier to locate than I anticipated, probably due to the distinctive
appearance of this area.
Object appears to be embedded in Open Cluster NGC 2169. A possible split of the primary at 91x, confirmed at 183x. No chance at the Mag 12.5 component with this aperture.
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| Orlon Petterson | ||||
| Star:
Struve 848
Date & Time: 22 February, 2000, 10:00-10:45 UTC Seeing: 8-9 <1-10 Seeing Scale (10 best)> Location of site: Christchurch, New Zealand 43 deg S Site classification: Suburban Sky darkness: 5 Mag, with a gibbous moon to the east <Limiting magnitude> Telescope: C102 f/10 refractor Magnification: 27x 50x 133x |
Easy to see
3 of the 4 components to this system at low power. The closest components
were split at high power. All appear to be white, or maybe slightly
blue-white for the fainter stars when compared with the primary.
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| Jay Zimmerman | ||||
| Star:
Struve 848
Date & Time: 03/07/00, 0430 UT Seeing: 6-7 <1-10 Seeing Scale (10 best)> Location of Site: Carbondale, IL, USA Site Classification: Suburban/near rural Sky darkness: 5.5 <Limiting magnitude> Temperature: 57°F (14°C) Telescope: 97mm, f7 apo Magnification: 26.7x, 160x |
Remarks: A
total of 4 components were visible out of the 5 stars that comprise this
multiple. AB, D, and E were easily split at 26.7x. The A-B split required
160x, and the stars seemed closer than 2.6", probably due to their low
magnitudes. All appeared
to be blue-white. I could not find C, the 12th magnitude component. At low power, when AB appears single and C is invisible, STF 848 becomes, in effect, a 3-star system (AB, D, and E). The two additional stars that complete the "arrowhead" asterism must then be cluster members (NGC 2169) but not physical parts of the multiple system. |
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| G.E.O.D.A Group | ||||
| Star:
Struve 848
Date & Time: 11-III-2000, 18.30-21.30 UT Seeing: 7 <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: 3 <Limiting magnitude> Telescope: Meade 10" LX-200 SCT Magnification: 200x |
Published measures
are the mean of two observations made from two different observers.
d = 4.4-xxx-33.4-50.4; PA = 114-xxx-121-185 Note: the third component
was not observed.
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