Comet
C/2021 A1 Leonard

Object :	Comet, C/2021 A1 Leonard
Coordinates/Direction :	Northern Sky
Object size :	1.2 km
Orbital period :	80000 years
Perihelion :	0.62 AU, shortest distance to Sun
Apparent magnitude :	~4, peak, in Hercules, December 2021
Mass :	- kg
Discovered by :	Gregory J. Leonard (Mount Lemmon Survey), January 2021
More to know :	More info at Seiichi Yoshida's homepage: http://www.aerith.net/ comet/ catalog/ 2021A1/ 2021A1.html Wikipedia: https://en.wikipedia.org/ wiki/C/ 2021_A1_(Leonard)

Comet's light curve:

Comet Leonard C/2021 A1, light curve 2021

Credit: software 'Comet for Windows' from Seiichi Yoshida

The magnitude of the comet around the days I photographed it.

Comet C/2021 A1 Leonard, 2021-12-07

Date :	2021-12-07
Time (UT) :	00:47 to 03:18

Mount :

SkyWatcher HEQ5, belt modified, low rider

Guide :

QHY5 camera with 200 mm f/3.5 lens

Lens/telescope :	Pentax 645 300 mm ED f/4 (set to f/4)
Corrector/Barlow :	-
Field (FOV) :	6.8x4.5^o (full frame) before crop

camera :	Canon 6D, QE=0.5, full frame, 20 Mpixel, 14 bit
camera temperature:	About 6^o C above surrounding temperature
Film/CCD :	Raw, Cr2
Filter :	none

Control system:

Mount, camera, focus, guide (Ekos) controlled by Astroberry (KStars/Ekos Linux)

Exp. time :	181*30 seconds at ISO800
Image process tool :	AstroImageJ, Fitswork
Processing :	Flat calibrated, bias subtracted, cropped about 70%.

Site :

Sweden, Stockholm, Hagsätra. Bortle 9
Free view Az: 20^o to 90^o, 165^o to 185^o, Alt: 20^o to 55^o

Comment :

This was the first astrophoto of this season. I didn't even had time to polar align or focus correct. Comet Leonard can be as bright as magnitude 4, when I took this photo the magnitude was maybe 5.5. I can very sad about where I live, Bortle class 9 ! We have just come home from Fuerteventura, Bortle class 3.

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