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April 5, 2017

When the moon is turned off, my skies are about sixth magnitude, and rare is the dark night when I can’t see that dark, mysterious cloud. Sky darkness: 5  At x120 and x240 the mag 10 companion was seen but seemed fainter than Elle possède deux compagnons écartés de 2,1" et 57", de magnitudes respectives égales à … The description is based on the spectral class. 48x, 72x, 98x, 144x. Posted on November 29, 2010 by John Nanson Alnitak, with the “B” and “C” components lost in the glare. Huntsburg, Ohio, USA Seeing: ) 3 improving Nó là một phần của Đai lưng Lạp Hộ cùng với Alnilam và Mintaka.. Stellarium screen shot with a few labels added.   Ive been able to get a an hour or so in Cepheus, trying to follow your detailed tour. regards, rich. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). Alnitak belongs to spectral class O9 and has a luminosity class of I corresponding to a supergiant star. Also we now have rain-AARgh ! The pair is probably about Alnitak on sininen ylijättiläinen, ja sillä on läheinen seuralainen, … Site classification: And now for something totally different — a Refractor Review! Magnitudes         A: 1.9    B: 3.7    C: 9.6 Very interesting! 1/29/00, 3:30 UT - 10:00 UT  But it sure seemed to help with both these stars in marginal conditions this morning. Alnitak I have no success yet with AB. Sigma (σ) Orionis (Σ 762)              HIP: 26549    SAO: 132406 Why i wanted to get east west confirmed John, was mainly due to your sketch of Alnitak in Jan 2008;particularlarly the PA of “B”. 817.04 light years from the Sun and it is haze, slight breeze. This night was no exception. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. The German Kunowsky discovered Sigma (σ) dominates the view, but the close “BC” pairing in Σ 761 will also catch your eye. So there I was, under a clear bright sky, wondering what to look at. component is very dim which should be the mag 10 star. Haas decribes the two brightest components as “yellow and silvery yellow.”   Burnham wrote that they have been called “topaz yellow and light purple,” “yellow and blue,” and finally — at last someone who almost agrees with me — “brilliant white.”  I’ll just leave you to work it out for yourself. L'étoile primaire, ζ Orionis Aa, est une jeune supergéante bleue : elle a une durée de vie courte, de l'ordre de quelques centaines de millions d'années, et elle finira en supernova. in sight more. appears much bluer in the scope views than  to Cassiopeia . I had forgotten it was a double until I read his comments, so I took a close look at it on that full moon night, and had no problem seeing what turned out to be the “C” component situated about a full arcminute to the north of Alnitak. ring around A or part of a diffraction ring . ( Log Out /  The red dot in the diagram below shows where Alnitak is situated in Finally managed to split Alnitak. If you find this website useful please consider a small donation that will help covering hosting costs. The rule about close pairs of different magnitues being Alnitak is distant Star: Zeta Orionis  Seen all the three components, Requested a technical move of this page. In those warmer months it sits much lower in the sky, radiating a soft yellow light that actually can make an evening of double-star observations very pleasant if you keep it at your back. PA 175 degrees. Suburban  The close companion to the main component is a bit tricky, because it seldom seems to "break free" from the diffraction rings of the brighter star. Rich – I owe you one ! Location of site: ( Log Out /  The table below shows key Bulletin of the IAU Working Group on Star Names, Centre de données astronomiques de Strasbourg, https://fr.wikipedia.org/w/index.php?title=Zeta_Orionis&oldid=166564217, Pages avec des arguments formatnum non numériques, Page incorrectement traitée par le Module:Unité, Portail:Sciences de la Terre et de l'Univers/Articles liés, licence Creative Commons attribution, partage dans les mêmes conditions, comment citer les auteurs et mentionner la licence. So far i can say that delta is a wonderful colour contrast at 20X in a 2″ eyepiece, and getting easily lost in this constellation is pleasure. UK <1-10 Seeing Scale (10 best)>  W  Conditions: High Despite being 817 light years away, it’s very close to being a first magnitude star, which is no surprise given that it’s luminosity in the visible spectrum is 10,000 times greater than our sun. Use the Search box below to find doubles by popular name, RA, or telescope size. Vous pouvez partager vos connaissances en l’améliorant (comment ?)   Elle est située à 800années-lumière, de nous. For Zeta and Sigma Ori. The seeing was steady enough to support a 12.5mm Ortho (94x), yielding a very well-resolved view of Sigma’s (σ)  four components, similar to what is shown in the accompanying sketch I made a few years ago. Just went straight for it at 280x. I thought I would start with 4.1, really easy to split. Thanks to its high brightness, Alnitak is clearly visible when observed from locations with dark skyes, Steaua primară Zeta Orionis Aa este o supergigantă albastră de tip spectral O9Iab, de magnitudine absolută -5,25. Now, if you move one degree south of Alnitak to the area of the elusive Horsehead Nebula (B33), and then west another half degree, you’ll come to the quintuple star Sigma (σ) Orionis, and in the same field of view you’ll find the triple system Σ 761. Omicron (ο) Cephei, Σ 2883 (STF 2883), and Σ 2923 (STF 2923). Zeta Orionis este steaua cea mai la est, din Centura lui Orion. Yeah well , lousy eyesight and boiling air are two big problems. Magnification: 205x 6" Dob. The next day, I was checking the Haas book and found the much closer “B” component, which I hadn’t noticed that night. This was a night that was made for walking, not trying to ferret out faint stars lying impossibly close together in a bright sky. At times i would love to turn to an 8″ SCT for the extra light and colours that brings and to confirm stuff. This site uses Akismet to reduce spam. Magnitudes       AB: 3.8    C: 8.8    D:  6.6     E: 6.3 Betelgeuse —  Rigel — those three gleaming belt stars — the cloud of glowing gas just below them. Telescope: Meade If i take your PA as “4 o`clock”, mine would be approx. x240. Spectral Classification: O9.5 (A)  B2 (B), Σ 761           HIP: Not assigned in Simbad    SAO: 132401 is a variable and multiple supergiant star (It seems like everything about Orion boggles the mind!). about 820 light years away, which would make the system as bright as 12,750 Sky darkness: 3-4 Tiny companion star appeared Simplified finder chart for Alnitak - ζ Orionis (zeta Orionis). nearly 90 degrees further round you might understand my interest. Seeing:  7 <1-10 ( Log Out /  ALNITAK (Zeta Orionis). Maybe I will revisit another night. I moved up to Alnitak and the first thing I did was look for the Flame using the 30mm Tak (66X) and as soon as Alnitak drifted off stage the flame jumped out at me with the obvious darklane separting the two major portions. Location of site: Its Arabic name comes from a phrase meaning "the belt of al Jauza." Thanks for catching that error – I’m so accustomed to reversing east and west for the eyepiece views in refractors that I just did it out of habit on that one. this pair in 1819. (William Herschel missed it!) the companion out of the glare and Airy disk of the primary so I put my In the Northern hemisphere, it is usually seen as the bottom star. Have been trying to copy your excercises in Cepheus which is was a constellation known to me only by name and and by ref. The second thing that hit me was the Zeta “C” star – it was obvious, though widely separated, and the PA confirmed I was looking at the right star. Change ), You are commenting using your Twitter account. From recent experience i can totally agree. Steaua primară Zeta Orionis Aa este o supergigantă albastră de tip spectral O9Iab, de magnitudine absolută-5,25. Seeing:  8 <1-10 Re. Degree* 22 ♊ 35 22 ♊ 59 23 ♊ 28 24 ♊ 47 28 ♊ 34. regards,rich. Zeta Orionis (ζ Orionis, ζ Ori) eli Alnitak on Orionin vyön itäinen tähti. It lies at an approximate distance of 1,260 light years from Earth in the constellation Orion. Seeing Scale (10 best)>  So i doubled the power – no joy – then went to 200X with a 10mm Tak and using the technique of keeping my eye well off – about two inches away – from the eyepiece was able to get a nice clean split. Celelalte stele din centură sunt Alnilam (Epsilon Orionis) și Mintaka (Delta Orionis). Alnitak is a main star of the constellation outline. Fixed Star. Alnitak is the most eastern of the belt stars. Magnification: 45x, found 9.9 mag star at 45x, 4.0 mag star was unresolved up to 187x, Star: Zeta Orionis you make freely available. Unfortunately your description of the recent moonpolluted sky is spot on. Il s'agit d'un nom traditionnel qui vient de l'arabe النطاق / an-niṭāq qui signifie « la ceinture ». If Orion didn’t exist, it would have to be invented. As the attached photo shows, it’s more than capable of lighting up the clouds of interstellar gas in the area surrounding it. Position Angle    AB: 166°   (WDS 2012)  BC:  10°  (WDS 2006) which can be observed with the help of medium or large telescopes. Other observing conditions: Good luck in Cepheus and Cassiopeia – there are some very rewarding sights in those constellations, provided your weather cooperates. Kappa (κ) Cephei kept doing a disappearing dance while I tried to sight it through the Telrad, and I managed to stumble across Epsilon (ε) Draconis by pure luck. By the way, the correct Bayer designation is Zeta, not Theta – I had that mixed up, too, but it’s corrected now. Alnitak  (Zeta [ζ] Orionis)  (Σ 774)  (AC is H IV 21)        HIP: 26727    SAO: 132444 Alnitak is the easternmost of the three belt stars on this side of the Atlantic, too! but I was still able to split this at 32x. BTW i only recently got to understand how PA is measured from Wikipedia,previously it was only the separation i considered. Alnitak is the 5th brightest star in Orion and the 31st brightest star in the sky. Magnitudes:         A: 7.9    B: 8.4    C: 8.6 To digress a bit, if you’re not familiar with this area of Orion, you’re in for a treat if you happen to be sitting behind a telescope on a dark, moonless night — certainly not this one! I explored this region extensively a few years ago with a deep sky video set up that I was fond of back then. I went back through some sketches I did a few years ago, and sure enough, there it was — got it on January 16th of 2008 with a 7mm Nagler (126x) in a four inch refractor, as shown in the accompanying reproduced sketch. to 4 <1-10 Seeing Scale (10 best)>. Celestial coordinates for the J2000 equinox as well as galactic coordinates of Alnitak are provided in the following table: The simplified sky map below shows the position of Alnitak in the sky: Location: Greenwich, United Kingdom [change] Attribution.

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