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Down from Orion

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#1 Bigzmey

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Posted 01 March 2021 - 11:14 PM

2/27/21

 

Location: home, Bortle 6.0
Equipment: Stelarvue 102ED on SW AZGti mount, set of Vixen SLV EPs.

 

When someone thinks of winter sky, Orion and Sirius/Canis Major come to mind. The eyes and scopes naturally gravitate to their recognizable star patterns. The area around is devoid of bright stars and looks unappealing. Yet it still contains some interesting targets. I have dedicated the evening to the seldom visited constellations of Lepus, Columba, and Caelum. I have started with Caelum since it had the shortest window of visibility.

 

Caelum doubles

BVD 48 – 6.8, 8.7, 8.9, ab52”, ac99.5” – attractive triple with brighter yellow main flanked by equal orange stars. SLV 25mm (29x).
SKF 811 A,BC – 7.3, 7.3, 149.9” – wide pair of identical white stars. SLV 25mm (29x).

 

Lepus doubles
 

HJ 3759 – 5.9, 7.3, 26.5”, yellow, white – nicely presented at low power. SLV 25mm (29x).

 

HJ 3780 (BU 321) – 6.7, 8.9, 9.6, 7.9, 8.3, 11.2, 10.9, ac89.3”, ae75.6”, af133.9”, ag59.6”, cd1.4”, ci52.4”, – a must see attractive multiple system which has it all. At low power (SLV 25mm, 29x) one is presented with a neat pattern of four multicolor stars in the empty field: A – pure bright white (I call it snow-white :)), C – bluish, E – yellow, F – silver. Digging deeper (SLV 6mm, 116x) resolves fainter grayish I component. Finally, at 286x (SLV 2.5mm) C and D are partially split. On a good night I could resolve with SV102ED stars down to mag 12. This time the air was humid, scattering the light from nearly full Moon, which brought the detection cutoff to slightly above mag 11. As a result, I could not resolve component G and few other faint doubles this evening.

 

HDO 77 – 6.9, 7.9, 11.3, ab11.4”, ac32.7” – AB – white unequal pair, SLV 25mm (29x). Could not detect C.
HJ 3788 – 7.6, 9.2, 26”, white, blue – nice contrast. SLV 25mm (29x).
HJ 3798 – 8.2, 8.8, 15.5”, white, yellowish – nicely framed with SLV 25mm (29x).
BU 94 – 5.7, 8.2, 2.3”, yellow, silver – partial split with SLV 2.5mm (286x).

 

Columba doubles

HJ 3732 – 7.2, 7.5, 85.6”, orange pair. SLV 25mm (29x).
HJ 3760 AB – 7.8, 8.4, 7.4”, yellow, blue. Nice colors. SLV 25mm (29x).
HJ 3857 – 5.7, 9.8, 6.9, ab13.1”, ac63.5” – AC – yellow and white (SLV 25mm, 29x), AB – FAIL.
HJ 3858 – 6.4, 7.6, 8.2, ab134.4”, bc3.8” – AB – orange, bluish (SLV 25mm, 29x), BC – tight clean split with SLV 6mm (119x).
SHY 185 AB, 6.4, 7.3, 287.5”, white, yellowish. SLV 25mm (29x).


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#2 payner

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Posted 02 March 2021 - 11:36 AM

Nice report on some often overlooked constellations. Last night I spent time mapping out my planned foray into the doubles listed in the Double Star Atlas

 

Thanks for posting. 

 

Randy


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#3 chrysalis

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Posted 02 March 2021 - 12:09 PM

HJ 3780 (BU321) - from Cartes du Ciel:

 

Double Star
BU  321 AB   
Magnitude:  6.69/ 7.83
1874:  0.5"/135°
2002:  0.4"/153°
Spectral Class: B7V      
Note:  p
DM:-17  1199

J2000 RA:   5h39m16.20s   DE:-17°50'57.0"
Date  RA:   5h40m12.22s   DE:-17°50'19.6"


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#4 Bigzmey

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Posted 02 March 2021 - 03:39 PM

HJ 3780 (BU321) - from Cartes du Ciel:

 

Double Star
BU  321 AB   
Magnitude:  6.69/ 7.83
1874:  0.5"/135°
2002:  0.4"/153°
Spectral Class: B7V      
Note:  p
DM:-17  1199

J2000 RA:   5h39m16.20s   DE:-17°50'57.0"
Date  RA:   5h40m12.22s   DE:-17°50'19.6"

That would be AB, which I can't split with my scope, and here is info for all 10 stars assigned by WDS to this system

 

https://www.stelledo...?iddoppia=21001


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#5 chrysalis

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Posted 02 March 2021 - 05:35 PM

That would be AB, which I can't split with my scope, and here is info for all 10 stars assigned by WDS to this system

 

https://www.stelledo...?iddoppia=21001

Right!! But at least the coordinates are correct to center on the entire system ;) .


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#6 John Fitzgerald

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Posted 03 March 2021 - 11:37 AM

The OP inspired me to look at some of the doubles in the post. I did so last evening.  The seeing was sort of poor down low in the south, and not a whole lot better higher in the sky.

 

Bu 94 (WDS 05496-1429) m 5,7, 8.2, sep 2.3, PA 165 deg. The seeing down low would not allow resolution of this unequal pair, even though I tried various powers up to 243 x with my 6" f/8 apo for many minutes. I may try again soon if I get the chance.

 

HJ 3857 AB (WDS 06240-3642) m 5.7, 9.8 sep 13", PA 255 deg. I stared at this one at length with a power of 173, then with 203x, did not see the companion, then switched to 135x and immediately saw the tiny pinprick of light. Then, also saw it at 81x. Sometimes, in poor seeing, less is more, I guess. Star C, m 6.9, is some 63" distant.

 

HJ 3858 BC (WDS 06255-3504) m 7.6, 8.2, sep 3.9" at PA 310 deg. This one was easy at 173x. Star A, m 6.4, is 134" distant.


Edited by John Fitzgerald, 03 March 2021 - 11:38 AM.

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#7 mauigazer

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Posted 04 March 2021 - 12:43 AM

HJ 3780 (BU 321) – 6.7, 8.9, 9.6, 7.9, 8.3, 11.2, 10.9, ac89.3”, ae75.6”, af133.9”, ag59.6”, cd1.4”, ci52.4”, – a must see attractive multiple system which has it all. At low power (SLV 25mm, 29x) one is presented with a neat pattern of four multicolor stars in the empty field: A – pure bright white (I call it snow-white smile.gif), C – bluish, E – yellow, F – silver. Digging deeper (SLV 6mm, 116x) resolves fainter grayish I component. Finally, at 286x (SLV 2.5mm) C and D are partially split. On a good night I could resolve with SV102ED stars down to mag 12. This time the air was humid, scattering the light from nearly full Moon, which brought the detection cutoff to slightly above mag 11. As a result, I could not resolve component G and few other faint doubles this evening.


 

I observed this system back in January, 2017 from our location here in Hawaii. The multiple is quite beautiful, and you noticed more colors than I did... I saw the Primary as Blue/White and the E Companion as orange. I saw the AB pair as one star and the CD pair as one star. I think I got the G and the I components. I'm not sure the star to the North is the F component. It seems too far out in Sep. in my sketch. I observed with a 4" Vixen refractor although the seeing and transparency were good. I estimated a seeing of 3/5 and a transparency of 6/7 with 11mph wind, 9% humidity and 47° F. temp at the summit, 10,000 ft. elevation. Here it is from My Media:

 

 

HJ 3780 In Lepus

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#8 mauigazer

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Posted 04 March 2021 - 12:57 AM

I made a sketch of HJ 3858 exactly three years later on January 26, 2020. The conditions were about the same with wind at 10mph, humidity at 10% and temperature at 43° F. I estimated the seeing at 4/5 and the transparency at 9/10. I didn't see the color of the primary that you did using a C925, (I think I get better colors when I use a refractor). The field star off to the west is TYC 7081-1377, Mag. 9.7. The BC pair are indeed a tight at 3.9". I was able to power up to 392X with a TeleVue Delos 6mm for the High Power view. Here it is from My Media:

 

Col HJ 3858 McG

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#9 John Fitzgerald

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Posted 04 March 2021 - 01:11 AM

<snip>

 

Bu 94 (WDS 05496-1429) m 5,7, 8.2, sep 2.3, PA 165 deg. The seeing down low would not allow resolution of this unequal pair, even though I tried various powers up to 243 x with my 6" f/8 apo for many minutes. I may try again soon if I get the chance.

 

<snip>

I revisited Bu 94 tonight (3 Mar) in a bit better seeing, and was able to get resolution with a 6mm TV Delos at 203x.   It was still difficult.


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#10 Carbstone

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Posted 10 March 2021 - 08:21 AM

Attracted by the drawings of 'Mauigazer', I spent some time observing BU 321.Heavily handicapped by the light resolution (I live between Brussels and Antwerp and Lepus was low on the horizont.) I could only see 4 of the 6 stars, no colors. No matter how hard I tried I (M 10.8) and H (11.1) were not observable. Splitting AB and CD was completely hopeless. Nevertheless, the 4 stars alone in the image with a gray-black background was one of the highlights of the evening. I will write this one in my bucket-list for the next opportunity at a remote area.

Attached Thumbnails

  • HR 1944  BU 321.jpg

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#11 litesong

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Posted 14 March 2021 - 11:13 AM

Here’s a sweet article  “New Wide Common Proper Motion  Binaries” including BVD 48, from Journal of Double Star Observations, Vol. 6. No 1  January 1, 2010  about:

///////////

2/27/21

Caelum doubles

BVD 48 – 6.8, 8.7, 8.9, ab52”, ac99.5” – attractive triple with brighter yellow main flanked by equal orange stars. SLV 25mm (29x).

/////////

The article contains numerous BVD stars including BVD 48, AND black & white negative images (my favs). Speculation is made whether BVD 48 is similar to the Trapezium in Orion.  Also, lots of information here.


Edited by litesong, 14 March 2021 - 12:11 PM.

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#12 ssmith

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Posted 17 March 2021 - 09:03 AM

HJ3780 is certainly one of the more colorful association of stars though it appears to be neither a true multiple star system or cluster even though it has a NGC designation of NGC 2017.

 

It has been variously described in the literature as being "non-existent", "a dissolved cluster", or "an asterism". 

 

The WEBDA open cluster database has no data listed for it. Distances for the brighter members range from 500 to 2,400 LY.

 

HJ3780 Lep 120mm 1-27-16 small.jpg


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#13 flt158

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Posted 17 March 2021 - 10:34 AM

Thank you for your most excellent image, Steve. waytogo.gif

You're totally correct. 

There are some contrasting colours here: blue, orange, warm white and pure white are the main ones I see. 

Sad to say I cannot observe NGC 2017 or HJ 3780 from my abode as it is too low down. 

 

Clear skies from Aubrey. 




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