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Observing >> Deep Sky Observing

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Danzup77
professor emeritus

Reged: 09/12/11

RA/Dec for Zeta Oph new

#5630503 - 01/18/13 07:55 PM

Its of no use to me right now anyway as I dont have a clear sight of it but I'm trying to come up with a current RA/Dec for Zeta Oph. I keep finding them but literally every one is different. Thing isnt moving THAT fast is it?!!! hehe

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rtomw77
Pooh-Bah

Reged: 10/06/04

Loc: Deer Valley, AZ

Re: RA/Dec for Zeta Oph new

[Re: Danzup77]
#5631058 - 01/19/13 05:07 AM

SIMBAD J2000 coordinates for Zeta Ophiuchi:
16h 37m 09.5s -10º 34' 01.5"

The wonderful astronomy reference Wikipedia (

) also gives these figures.

SIMBAD also gives the J1950 coordinates that differ slightly. Some references such as Burnham's use the ones from the 1950 epoch. Maybe this is what you are seeing.

Tom

P.S.
It looks like David and I made simultaneous posts. I left off a few numbers on the far right of the decimal point in case you are wondering.

Tom

Edited by rtomw77 (01/19/13 05:32 AM)

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David Knisely
Postmaster

Reged: 04/19/04

Loc: southeastern Nebraska

Re: RA/Dec for Zeta Oph new

[Re: Danzup77]
#5631059 - 01/19/13 05:07 AM

Quote:

Its of no use to me right now anyway as I dont have a clear sight of it but I'm trying to come up with a current RA/Dec for Zeta Oph. I keep finding them but literally every one is different. Thing isnt moving THAT fast is it?!!! hehe

No, but the coordinate system is changing due to the slow precession of the Earth's axis. This changes the coordinates of all objects slowly but continuously. Generally for charting purposes, we specify what year the coordinates are valid for (the coordinate "equinox"). The standards are set about every 50 years or so (1950, 2000, 2050, etc.). Right now, most people use the eq. 2000.0 coordinate system. For that, Zeta Oph is:

R.A. 16h 37m 9.593s
Dec. -10 deg. 34' 1.53"

Clear skies to you.

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Danzup77
professor emeritus

Reged: 09/12/11

Re: RA/Dec for Zeta Oph new

[Re: David Knisely]
#5695956 - 02/23/13 01:22 AM

David, my apologies on the extremely long delay in response. And thank you very much, I appreciate the reply as always.

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JakeSaloranta
scholastic sledgehammer

Reged: 09/18/08

Loc: Sisu Sauna Sibelius

Re: RA/Dec for Zeta Oph new

[Re: Danzup77]
#5696100 - 02/23/13 06:17 AM

Tut-tut, this is the Deep Sky Observing-forum. Single stars belong to General Observing and Astronomy-forum

/Jake

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David Knisely
Postmaster

Reged: 04/19/04

Loc: southeastern Nebraska

Re: RA/Dec for Zeta Oph new

[Re: JakeSaloranta]
#5696695 - 02/23/13 02:07 PM

Quote:

Tut-tut, this is the Deep Sky Observing-forum. Single stars belong to General Observing and Astronomy-forum

/Jake

Zeta is a good take-off star for star hopping to the globular M107 or the open cluster Dolidze 27. Maybe the gentleman uses Zeta for an alignment star to improve local Go-To slew accuracy in that area of the sky and ran into the coordinate question. In any case, a simple question like this is a minor momentary deviation from the main subject matter of this forum. It can easily be answered regardless of what forum it shows up in without ruffling too many feathers. Clear skies to you.

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blb
Post Laureate

Reged: 11/25/05

Loc: Piedmont NC

Re: RA/Dec for Zeta Oph new

[Re: David Knisely]
#5696712 - 02/23/13 02:19 PM

Isn't it true that anything outside of our solar system is deep sky? I too am of the opinion that deep sky objects are non stellar but I do not mind a stellar object being discussed now and then.

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JakeSaloranta
scholastic sledgehammer

Reged: 09/18/08

Loc: Sisu Sauna Sibelius

Re: RA/Dec for Zeta Oph new

[Re: David Knisely]
#5696786 - 02/23/13 03:07 PM

Quote:

Zeta is a good take-off star for star hopping to the globular M107 or the open cluster Dolidze 27. Maybe the gentleman uses Zeta for an alignment star to improve local Go-To slew accuracy in that area of the sky and ran into the coordinate question. In any case, a simple question like this is a minor momentary deviation from the main subject matter of this forum. It can easily be answered regardless of what forum it shows up in without ruffling too many feathers. Clear skies to you.

Jeez, all I was saying is that if you are gonna post a question why not do it in the right place and generally for the best outcome. There is no reason to get in to this more than this.

And Buddy, I see em as non-stellar objects, outside the solar system.

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Danzup77
professor emeritus

Reged: 09/12/11

Re: RA/Dec for Zeta Oph new

[Re: JakeSaloranta]
#5697093 - 02/23/13 06:43 PM

My apologies on not reading Jakes rule book before posting lol........And perhaps there should be a "Stellar Observing" forum if thats the case.......

Bubbye

Edited by Danzup77 (02/23/13 06:43 PM)

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