Re: Two comets

Dan Crowson
 

ASASSN - around 35 seconds 1x1
Africano - around 5 seconds 1x1

(these are the rates for tonight - 2019-09-28)
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Dan Crowson dcrowson@...
Dardenne Prairie MO http://www.crowson.com

-----Original Message-----
From: DarkSkyNewMexico@groups.io [mailto:DarkSkyNewMexico@groups.io] On Behalf Of Madhup Rathi
Sent: Saturday, September 28, 2019 8:07 PM
To: DarkSkyNewMexico@groups.io
Subject: Re: [DarkSkyNewMexico] Two comets

My arcsec/pixel ratio is 0.68" per pixel. (QSI 683 wsg is 5.4 micron and AG Optical 10" is 1650 mm.)

Thanks for your help.

-----Original Message-----
From: DarkSkyNewMexico@groups.io [mailto:DarkSkyNewMexico@groups.io] On Behalf Of Dan Crowson
Sent: Saturday, September 28, 2019 8:36 PM
To: DarkSkyNewMexico@groups.io
Subject: Re: [DarkSkyNewMexico] Two comets

Madhup,

Exposure length on these is dependent on your equipment (arcsec/pixel ratio). If you wanted to give me yours, I can give you the max exposure length you can do before seeing trailing. This assumes 1 arcsec seeing so you can go longer if you want but results vary.

The formula I use (just have it in excel)is:

([arsec/pixel ratio]/([higher of the movement in RA or Dec - arsecs/sec out of TheSkyX] * 60)) * 60

As Gregg mentioned, Africano is close so moving much quicker than ASASSN.

Dan
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Dan Crowson dcrowson@...
Dardenne Prairie MO http://www.crowson.com


-----Original Message-----
From: DarkSkyNewMexico@groups.io [mailto:DarkSkyNewMexico@groups.io] On Behalf Of Madhup Rathi
Sent: Saturday, September 28, 2019 7:27 PM
To: DarkSkyNewMexico@groups.io; 'Eureka Observers Club' <EurekaObsClub@...>; 'St. LouisAstronomy' <STLAstronomy@...>; 'ASEMDigitalSIG' <ASEMDigitalSIG@groups.io>; taaaforum@...
Subject: Re: [DarkSkyNewMexico] Two comets

Very nice, Gregg. What are the lengths of individual subs.

-----Original Message-----
From: DarkSkyNewMexico@groups.io [mailto:DarkSkyNewMexico@groups.io] On Behalf Of Gregg Ruppel
Sent: Saturday, September 28, 2019 7:22 PM
To: Eureka Observers Club <EurekaObsClub@...>; St. LouisAstronomy <STLAstronomy@...>; ASEMDigitalSIG <ASEMDigitalSIG@groups.io>; taaaforum@...; DSNM <DarkSkyNewMexico@groups.io>
Subject: [DarkSkyNewMexico] Two comets

Hi all:
Two comets are currently visible (in moderate sized scopes) in the evening sky - they both are sporting tails:

c2018 W2 Africano
http://www.greggsastronomy.com/IMAGES/c2018-W2-Africano-LRGB_092719.jpg

c2018 N2 ASASSN
http://www.greggsastronomy.com/IMAGES/c2018-N2-ASASSN-LRGB_092719.jpg

40 minutes total exposure for each.

--
Clear skies,

Gregg
Visit my astronomy & astrophotography site http://www.greggsastronomy.com/

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