toggle quoted messageShow quoted text
Hi Jerry, thanks for your reply. I am using the Android APP.
The difference I see is much greater. First I will make the correction of the error cone and I will make the observation again.
El El jue, 14 de nov. de 2019 a las 16:57, Jerry Hubbell - Explore Scientific VP Engineering <jrh@...
On Thu, Nov 14, 2019 at 08:29 AM, Rodrigo Zelada wrote:
The punctual case with Saturn, which is currently in Sagittarius, one of the stars I used to align was Nunki, very close to Saturn's position. If I move the mount with the information of the catalog to Altair, it arrives well, (not centered by the effect of the cone error), if I move it to Shaula it also arrives relatively well, if I turn to M8 it also arrives well, but Saturn remains quite far (with Jupiter the same thing happens with Saturn), Saturn it is not seen in the telescope's visual field as in the other cases.
Hi Rodrigo, sorry you are having this issue. it sounds like you have your southern hemisphere problem fixed again. I assume you are using the iPadOS version of ExploreStars
To make sure the ephemeris program is working within ExploreStars I compared the current apparent coordinates for Saturn in Cartes du Ciel with those calculated in the iPadOS version of ExploreStars
Saturn @ 1942 UTC 2019-11-14
CdC RA: 19h11m26.60s DE:-22°18'27.7"
ExploreStars RA: 19h11m51.00s DE::-22°17'57.0"
Jupiter @ 1947 UTC 2019-11-14
CdC RA: 17h43m07.55s DE:-23°12'44.9"
ExploreStars RA: 17h43m09.00s DE:-23°12'48.0"
As you can see the ephemeris calculation in ExploreStars is better for Jupiter than Saturn, but even then the difference in position is equal to 6.1 arc-min in RA and 0.51 arc-min in DEC for a total difference of 6.12 arc-min. This is well within most eyepieces anyone would use when finding an object. The difference for Jupiter's coordinates is only 23 arc-sec or about 0.36 arc-minutes. So you would not see any difference in the pointing at Jupiter than a star nearby.
That only leaves some mechanical issue with your gear lash or flexure somewhere.
Vice President of Engineering
Explore Scientific, LLC.
jrh at explorescientific.com
1010 S. 48th Street
Springdale, AR 72762
Author: Scientific Astrophotography: How Amateurs Can Generate and Use Professional Imaging Data
Remote Observatories for Amateur Astronomers: Using High-Powered Telescopes From Home
Mark Slade Remote Observatory (MSRO) IAU MPC W54 Equipment
Mounts: ES PMC-Eight G11 + Telescope Drive Master (TDM)
Scopes: ES 165 FPL-53 ED APO CF, ES 102 FCD100 ED APO CF
Cameras: QHY174M-GPS + FW, QHY163C
Misc: 3-inch 0.7x Focal Reducer Field Flattener, Filters: Luminance,
Red, V-band Photometric, Diffuser, 200 lpmm Spectral Grating
Software: MaxIm DL 6, Cartes du Ciel, Astrometrica, AstroImageJ, AutoStakkert!
Rodrigo Zelada B.
Equipamiento para observación astronómica.
+56 9 9321 6519 / + 56 9 9624 0750
Cristóbal Colón # 352 oficina 514, La Serena
IV Región de Coquimbo.www.northoptics.cl