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Comets & Asteroids highest moving RA DEC rate

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#1 PhilCo126

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Posted 20 June 2013 - 12:54 PM

Which NightSky software programs provide the moving rate of asteroids & comets in order to calculate the "maximum exposure time without trails" once You know the limiting magnitude for your scope and arcsec/pixel rate for Your camera... (Stellarium & StarryNight don't provide this info)
:question:

#2 btschumy

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Posted 20 June 2013 - 01:02 PM

SkySafari has this info. Say for Ceres:

R.A. +112.8250 s/day
Dec. -291.984 "/day

#3 Man in a Tub

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Posted 20 June 2013 - 02:22 PM

SkyTools3 for Ceres:

Earth Distance: 3.4 AU
Sun Distance: 2.6 AU
Elongation: 30°
Total motion: 1.08 "/min
RA: 1.18 "/min
Dec: -0.21 "/min

#4 *skyguy*

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Posted 20 June 2013 - 08:02 PM

TheSky6 for Ceres:

RA rate (arcsecs/sec) 0.0196
Dec rate (arcsecs/sec) -0.0035

#5 knightware

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Posted 21 June 2013 - 06:52 AM

Deep-Sky Planner 6 computes total motion over a time period that you specify. For example, Ceres on June 21 at 8am EDT:

Elongation: 29.9°W
Distance (Earth): 3.3960au
Distance (Sun): 2.5660au
Total motion traveled over previous minute: 1"

You can change the time period for the motion traveled calculation to suit your imaging equipment. Theoretical limiting magnitude and image scale calculations are provided for your equipment

#6 PhilCo126

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Posted 21 June 2013 - 10:45 AM

Thx for the replies...

Anyone using the Sky X ?
What's the difference between "serious" & " professional" versions ?

#7 SabiaJD

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Posted 28 June 2013 - 12:52 AM

The Minor Planet & Comet Ephemeris Service (http://www.minorplan...PEph/MPEph.html ) will also provide the information of sky motion of an asteroid.

CERES list as 1.08 "/min






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