Need rec/dec data of Galactic Equator

I would like to draw the line of "Galactic Equator" in my own star map,
but for this I need some junctures. Does anyone know the formula of
"Galactic Equator" or does anyone know data of rectascension and
declination?

Because it is an ellipse/circle I need only few values (ca. 8) of
rectascension and declination to connect the points.

Any idea?

Heinz

"Heinz" wrote in
ups.com:

I would like to draw the line of "Galactic Equator" in my own star map,
but for this I need some junctures. Does anyone know the formula of
"Galactic Equator" or does anyone know data of rectascension and
declination?

Because it is an ellipse/circle I need only few values (ca. 8) of
rectascension and declination to connect the points.

Any idea?

Heinz



Actually you only need two points to draw a great circle. Do yourself a
favour and download Sky Charts (Cartes Du Ciel). It will plot the galactic
equator if you set it to do that.

http://www.stargazing.net/astropc/

Klazmon

In article . com,
"Heinz" wrote:

I would like to draw the line of "Galactic Equator" in my own star map,
but for this I need some junctures. Does anyone know the formula of
"Galactic Equator" or does anyone know data of rectascension and
declination?

Because it is an ellipse/circle I need only few values (ca. 8) of
rectascension and declination to connect the points.

As Llanzlan said, in principle you only need two--as long as they're not
opposite each other.

According to Peter Duffett-Smith's _Practical Astronomy With Your
Calculator_, the north galactic pole is at RA 12:49 Dec +27°24', and the
galactic longitude of the plane's ascending node on the celestial
equator is 33°. So to plot the galactic equator in right ascension and
declination, you could use the following pair of formulae, where L is
the longitude of a point on the GE:

Dec = asn(cos(27°24')sin(L - 33°))

RA = 12h49m + (atn(cos(L - 33°)/sin(27°24')sin(33° - L)))/(15°/h).

Run through values of L up to 360°, taking however many steps you need.

--
Odysseus

On 10 Jul 2006 14:22:42 -0700, "Heinz"
wrote:

I would like to draw the line of "Galactic Equator" in my own star map,
but for this I need some junctures. Does anyone know the formula of
"Galactic Equator" or does anyone know data of rectascension and
declination?

Because it is an ellipse/circle I need only few values (ca. 8) of
rectascension and declination to connect the points.

The galactic equator has declination 0 for all 24 hours of RA.


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Barry Schwarz wrote in
:

On 10 Jul 2006 14:22:42 -0700, "Heinz"
wrote:

I would like to draw the line of "Galactic Equator" in my own star map,
but for this I need some junctures. Does anyone know the formula of
"Galactic Equator" or does anyone know data of rectascension and
declination?

Because it is an ellipse/circle I need only few values (ca. 8) of
rectascension and declination to connect the points.

The galactic equator has declination 0 for all 24 hours of RA.


That's the celestial equator, not the galactic equator.

Klazmon.



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In article ,
Llanzlan Klazmon wrote:

Barry Schwarz wrote in
:

snip

The galactic equator has declination 0 for all 24 hours of RA.

That's the celestial equator, not the galactic equator.

Indeed! Note that the formulae I posted upthread were simplified by
assuming a galactic *latitude* of zero; some cos(B)s and entire terms in
sin(B) nicely disappear that way.

--
Odysseus

Hi all,
thanks for your help it was quite useful.

Cheers Heinz