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Thread: Double Star Mania!

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    milanpicard's Avatar
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    Default Double Star Mania!



    Well, since the White Shark is back again, I thought I would take the Cambridge Double Star Atlas out for a spin. THe last two nights were clear and I bagged 20 of them! It's insane, the designations are out of this world And I only used one single page, the one with Cancer and Lynx! Never again shall I be stalled by the Sharkey boy!

    It's useless to try to describe, some had 90" separation, some had 1.9" separation. Those under 4" were tough, glued together, but paradoxically, the one with 1.9 separation was clearly visible! I guess the atmospheric conditions also have a strong word to say at these low separations, the wind was blowing a bit, at the 1.9" I think I had a bit of pause from the wind. Anyway, here's the list, all from one single page!

    S 598, h 2477, OSTR 189, S 565, STR 1369, STR 1334, STR 1333, h 1166, STR 1298, Sh 100, S 583, STR 1291, K Leonis, h 2452.

    I know, these are only 14, but I left the best for the last! The Beehive Cluster! I asked about the multiple stars in them, and I got six of them! Quadruple, triple, double... S 574, S 571, STR 1254, S 570, STR 1249, 39 Cancri! It was awesome to look at an open cluster and analyze it in detail, where the star systems are and all that. It was a unique experience. And with this I got the list of my viewed object up to 300! This... is... Spartaaa!!
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    Default Re: Double Star Mania!

    Great job, Milan ! You are a double-star ninja ! I won't be viewing tonight, it has started clouding over. I have my books, atlases, and sundry notes to comfort me though.
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    Default Re: Double Star Mania!

    Nicely done! Welcome to the club! And I agree Beehive is such treasure.
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    Default Re: Double Star Mania!

    Quote Originally Posted by milanpicard View Post
    Never again shall I be stalled by the Sharkey boy!
    You got me laughing.
    Those doubles are additive.
    If you're not careful you'll be diving into cepheids and carbon stars!
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    Default Re: Double Star Mania!

    Great job, Milan! What way to stick it to Ol Hateful with unbridled enthusiasm.
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    Bryan

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    Default Re: Double Star Mania!

    Congrats on a productive night!

    Could you possibly provide the RA/DEC coordinates for these, please?

    h 2477
    h 1166
    Sh 100
    K Leo
    h 2452

    I'd like to take a look at the objects on your list when I get a chance, but I can't locate any information on those five doubles. I don't own a copy of the Cambridge DS Atlas either, so I have nothing to reference. I finally figured out what OSTR and STR meant - their proper designations should be STT (for O. Struve) and STF (for F. Struve).

    So far, I've only observed one from your list, S 570 in the Beehive, and that was around the first part of May. My log from that night shows I was able to resolve AB and AC with a 6" SCT and a 12.4mm Plossl. My notes say it is a nice wide triple star system of unmatched pairs, that B and C are about the same magnitude, with A being only slightly brighter.

    Cheers,
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    Default Re: Double Star Mania!

    Quote Originally Posted by exparrot View Post
    Congrats on a productive night!

    Could you possibly provide the RA/DEC coordinates for these, please?

    h 2477
    h 1166
    Sh 100
    K Leo
    h 2452

    I'd like to take a look at the objects on your list when I get a chance, but I can't locate any information on those five doubles. I don't own a copy of the Cambridge DS Atlas either, so I have nothing to reference. I finally figured out what OSTR and STR meant - their proper designations should be STT (for O. Struve) and STF (for F. Struve).

    So far, I've only observed one from your list, S 570 in the Beehive, and that was around the first part of May. My log from that night shows I was able to resolve AB and AC with a 6" SCT and a 12.4mm Plossl. My notes say it is a nice wide triple star system of unmatched pairs, that B and C are about the same magnitude, with A being only slightly brighter.

    Cheers,
    Jerry
    Well, for the Beehive cluster I googled it: struve stars in M44. THere was a blog, or what, which showed a nice pic with the six targets, plus descriptions, for ex. that STT 1254 is a quadruple star and what shape it has. Some even see galaxies in the Beehive.

    SOrry about getting the designations mixed up, the Struve stars are written with a Greek letter that resembles an E and I don't have on my board, and the Otto Struve ones with an OE (Greek). Now I know.

    K Leo is RA 09 25 Dec +26 11
    h 1166 is RA09 31 Dec +67 32
    h 2477 is the star Talitha in Ursa Major RA08 59 Dec +48 03
    sh 100 is RA 09 00 Dec +32 25
    h 2452 is RA 08 32 Dec +18 06

    Phew, it was hard work looking them up.
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    Default Re: Double Star Mania!

    I wlso made some observations last night, this time around Leo. I saw Zosma and Denobola, both around 200" with the companion, in the forelegs of Ursa Major Alula Borealis (STT 1524) and Alula Australis (STT 1523), Beta pm also there, and in Leo Minor S 612.

    IN frustration for finding no Herschel galaxies with the Moon on, I revisited the Virgos, which finally cleared my block, and found M84 and M86, and I possibly saw an "eye" too but not sure, I will definitely not stop fighting until I see them ! ANd M85 and M87, quite clearly.

    And finally Mooney honey retires!!
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    Default Re: Double Star Mania!

    I saw a lovely triple for the first time last Saturday night, Struve 1604 in Corvus. Rather than try to describe it, here's a drawing by Jeremy Perez. He mentions Sue French's book Deep Sky Wonders, and that is where my mate picked it up from.

    Thoroughly recommended.

    Struve 1604 - Belt of Venus
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    Default Re: Double Star Mania!

    Quote Originally Posted by milanpicard View Post
    Well, for the Beehive cluster I googled it: struve stars in M44. THere was a blog, or what, which showed a nice pic with the six targets, plus descriptions, for ex. that STT 1254 is a quadruple star and what shape it has. Some even see galaxies in the Beehive.

    SOrry about getting the designations mixed up, the Struve stars are written with a Greek letter that resembles an E and I don't have on my board, and the Otto Struve ones with an OE (Greek). Now I know.

    K Leo is RA 09 25 Dec +26 11
    h 1166 is RA09 31 Dec +67 32
    h 2477 is the star Talitha in Ursa Major RA08 59 Dec +48 03
    sh 100 is RA 09 00 Dec +32 25
    h 2452 is RA 08 32 Dec +18 06

    Phew, it was hard work looking them up.
    Thanks for looking them up, I appreciate it. For whatever reason, I'm just not able to find the "h" and "sh" designations. I thought at first that "h" was for William Herschel, but I cannot locate anything on those specific numbers.

    Which brings to mind the frustration of double star observing - the numerous catalogs and cross-references between them. Those Greek letters you mentioned (like Σ for F. Struve) were the standard back in the 19th century. Sometime in the 1960s, though, this all went from that 1-letter system to the 3-letter designations you now see (like STT and STF). Nevertheless, the old Greek letter designations have persisted in some 20th century publications, which just flames the fires of confusion. As of last year, there were almost 800 unique catalog designations in the Washington Double Star Star catalog (the WDS is the official keeper of all double star data). According to an analysis by Bruce MacEvoy (author, Cambridge Double Star Atlas, 2nd Ed.), around 100 of those catalogs comprise 98% of the known doubles. So, you can appreciate why there's so much frustration in trying to compile an observing list.

    Here's a good place to reference all those double star designations: Washington Double Star Catalog - Current Version

    Also, the aforementioned Mr. MacEvoy has an excellent website, which contains more information about double star history, observing techniques, amateur reporting tips, etc. than you ever thought imaginable: Astronomical Files from Black Oak Observatory

    Anyway, it was easy to look these up in the WDS with the coordinates you provided and the knowledge of which constellations you mentioned you were working that night. I can now give them a shot, if I ever get some decent weather.

    K Leo = Al Minliar al Asad, HD 81146, Kappa Leo, 1 Leo (Leo)
    h 1166 = STF 1349, HD 81787, ADS 7399A (Lynx)
    h 2477 = Talitha, HJ 2477, HD 76644, Iota UMa, 9 UMa (Ursa Major)
    sh 100 = HU 718, HD 76975, ADS 7124A (Cancer)
    h 2452 = HD 72094, Theta Cnc, 31 Cnc (Cancer)

    Cheers,
    Jerry
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