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Comet C/2020 F3 (NEOWISE)

Comet C/2020 F3 (NEOWISE) was captured between Jul 12 and Jul 25, 2020 using two different instruments. This page presents the results in chronological order where latest images are first. Details about the instrumetns can be found at the end of this page.

Index

Click on the images to jump to the larger version with description.
Jul 25, 2020. Instrument #2
Jul 25, 2020. Instrument #2.
Jul 24, 2020. Instrument #2
Jul 24, 2020. Instrument #2.
Jul 24, 2020. Instrument #1
Jul 24, 2020. Instrument #1.
Jul 20, 2020. Instrument #2
Jul 20, 2020. Instrument #2.
Jul 14, 2020. Instrument #1
Jul 14, 2020. Instrument #1.
Jul 14, 2020. Instrument #1
Jul 14, 2020. Instrument #1. Different white balance.
Jul 13, 2020. Instrument #1
Jul 13, 2020. Instrument #1.
Jul 12, 2020. Instrument #1
Jul 12, 2020. Instrument #1.

Jul 25, 2020. Instrument #2

Captured after sunset using instrument #2. The single exposures are aligned to the comet. Horizon is bottom.
Comet C/2020 F3 (NEOWISE) on Jul 25, 2020. Aligned to comet
This view shows the turqoise coma and the start of the tails.
 
The picture above is a 1.7° x 1.3° crop. Click on it to see the full view of 2.3° x 1.6°.
 
Total exposure time was 102min and images where taken whithin a period of 60min using two cameras.

Jul 24, 2020. Instrument #2

Captured shortly after sunset using instrument #2. The single exposures are aligned to the comet and rotated 90° CW, i.e. horizon is left.
Comet C/2020 F3 (NEOWISE) on Jul 24, 2020. Aligned to comet
This view shows a section of the tails. A wider view was captured at the same time and is presented below.
 
Field of view is is 2.3° x 1.6°. Click on the picture for a higher resolution.
 
Total exposure time was 87min and images where taken whithin a period of 45min using two cameras.
Note the movement of the structures in bluish gas tail. The clody movements are caused by fog near the horizon.
 
The animation consits in 22 frames. Each frame is the sum of exposures captured within a period of 10min. Temporal shift of the period is 2min per frame.

Jul 24, 2020. Instrument #1

Captured shortly after sunset using instrument #1. Horizon is bottom.
Comet C/2020 F3 (NEOWISE) on Jul 24, 2020. Aligned to comet
In comparison to the images taken between Jul 12 and Jul 14 (see below) the dust tail had been dimmed and the turquoise coma became visible.
 
The picture above is a 8.3° x 6.3° crop. Click on it to see the full view of 11.1° x 6.7° at higher resolution.
 
Single exposures are aligned to comet. Total exposure time was 97 min and images where taken whithin a period of 50min using two cameras.

Jul 20, 2020. Instrument #2

Captured shortly after sunset using instrument #2. The single exposures are aligned to the comet and rotated 90° CW, i.e. horizon is left. Observation condition where verry bad (clouds, low tranperency) and many exposures had to be dropped.
Comet C/2020 F3 (NEOWISE) on Jul 20, 2020. Aligned to comet
This picture shows the tuquoise coma, the grey dust tail and the ligh blue gas tail.
 
Field of view is is 2.3° x 1.6°. Click on the image for a higher resolution.
 
Total exposure time was 32min and images where taken whithin a period of 25min using two cameras.

Jul 14, 2020. Instrument #1

Captured shortly before sunrise using instrument #1. The images are rotated 30° CW, i.e. horizon is bottom left.
Comet C/2020 F3 (NEOWISE) on Jul 14, 2020. Aligned to comet
This view shows the structured dust dail (pinkish) and gas tail (mostly bluish). Single exposures are aligned to comet.
 
The picture above is a 4.3° x 3.1° crop. Click on it to see the full view of 8.1° x 5.6°.
 
Total exposure time was 60 min and images where taken whithin a period of 30min using two cameras.
Comet C/2020 F3 (NEOWISE) on Jul 14, 2020. Aligned to stars
Single exposures are aligned to stars. Field of view is 8.1° x 5.6°.
 
Total exposure time was 15 min and images where taken whithin a period of 7.5min using two cameras.
Comet C/2020 F3 (NEOWISE) on Jul 14, 2020. Colors of the gas tail.
In this image a point in the gas tail has been used for white balance. The colors in this tail come from different ions, mostly CO+ (blue) and H2O+ (red), see [1]. But not from Sodium because an Light pollution filter had been used which blocks wavelength between 540nm and 645nm.
 
Color factors relative to the images above (white balance using the stars) are 3.9 for red and 2.2 for green. Colors have not been mixed (no saturation enhancement).
 
The picture above is a 4.3° x 3.1° crop. Click on it to see the full view of 8.1° x 5.6°.
 
Single exposures are aligned to comet. Total exposure time was 60 min.

Jul 13, 2020. Instrument #1

Captured shortly before sunrise using instrument #1. The images are rotated 90° CCW, i.e. horizon is right.
Comet C/2020 F3 (NEOWISE) on Jul 13, 2020. Aligned to stars
This view shows the structured dust dail (pinkish) and blue gas tail.
 
Single exposures are aligned to stars. Total exposure time was 15 min and images where taken whithin a period of 7.5min using two cameras.
 
Field of view is 8.3° x 6.25°. Click on the image for a higher resolution.
Comet C/2020 F3 (NEOWISE) on Jul 13, 2020. Aligned to comet
Single exposures are aligned to comet. Total exposure time was 30 min and images where taken whithin a period of 15min using two cameras.
 
The picture above is a 4.3° x 3.1° crop. Click on it to see the full view of 8.1° x 5.6°.

Jul 12, 2020. Instrument #1

Captured shortly before sunrise using instrument #1. The images are rotated 87° CCW, i.e. horizon is right.
Comet C/2020 F3 (NEOWISE) on Jul 12, 2020. Aligned to stars
This view shows the structured dust dail (pinkish) and blue gas tail.
 
Single exposures are aligned to stars. Total exposure time was 20 min and images where taken whithin a period of 10min using two cameras.
 
Field of view is 8.3° x 6.25°. Click on the image for a higher resolution.

Observation Data

Intstrument #1

Pixel scale: 10 arcsec / pixel (at full resolution)
Location: Pulsnitz, Germany
Instrument: Two f=135mm, D=70mm photo lenses
Filters: Bayer CFA + Light pollution filter

Intstrument #2

Pixel scale: 4 arcsec / pixel (pictures at full resolution)
Location: Pulsnitz, Germany
Instrument: Two f=850mm, D=200mm Newton telescopes
Filters: Bayer CFA

References

1. Feldman P. D., Cochran A. L., Combi M. R., 2004, Spectroscopic Investigations of Fragment Species in the Coma.

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