Hemisphere:  Northern  ·  Constellation: Canis Minor (CMi)  ·  Contains:  PGC1235862  ·  PGC1241734  ·  PGC22023  ·  PGC3092289  ·  PGC97223  ·  PK217+14.1
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Abell 24 Planetary Nebula, 


            Jerry Macon
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Abell 24 Planetary Nebula

Imaging telescopes or lenses: PlaneWave Instruments CDK14

Imaging cameras: ZWO ASI6200MM-PRO

Mounts: Paramount MEII with Absolute Encoders

Software: Nighttime Imaging ‘N’ Astronomy N.I.N.A.  ·  PixInsight 1.8  ·  StarNet++ .

Filters: Chroma 3nm Oiii 50mm  ·  Antlia RGB 50mm  ·  Antlia Ha 3nm 50mm

Dates:Nov. 18, 2020Dec. 5, 2020Dec. 10, 2020

Antlia Ha 3nm 50mm: 116x300" (gain: 100.00) -15C
Antlia RGB 50mm: 202x30" (gain: 100.00) -16C bin 2x2
Chroma 3nm Oiii 50mm: 100x300" (gain: 100.00) -15C bin 2x2

Integration: 19.7 hours

Avg. Moon age: 16.03 days

Avg. Moon phase: 37.89%

Bortle Dark-Sky Scale: 3.00

Astrometry.net job: 4085890

RA center: 7h 51' 37"

DEC center: +2° 59' 49"

Pixel scale: 0.603 arcsec/pixel

Orientation: -89.737 degrees

Field radius: 0.482 degrees

Resolution: 4784x3194

Locations: Dark Star Observatory, Taos, New Mexico, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Imaged on nights of: 11/18/2020, 11/19/2020, 11/20/2020, 12/5/2020, 12/6/2020, 12/7/2020, 12/8/2020, 12/9/2020, 12/10/2020.
No dithering.
No guiding.
Fixed focus position (focuser inoperative)

I find this target unusual in having two very bright stars bracketing the PN, one exactly over the other, of the same brightness. Very striking. I also love the tiny face on spiral galaxy PGC22023 just below to the right, no color whatsoever. It is located 265 million light years from us, a long long way off. A couple of other galaxies are so small they look like tiny stars. It would be great to have some details about these, but I could find nothing with a web search.
Anyone know where to find details on these PGC objects?
From Robert: NASA/IPAC Extragalactic Databased (NED) is usually a good place to go.

Abell 24, also known as PK 217+14.1, A66 24 and ARO 134, is a planetary nebula — a burst of gas and dust created when a star dies and throws its outer layers into space.

Despite the name, planetary nebulae have nothing to do with planets.

The term was coined by the German-born British astronomer William Herschel, who also famously discovered the ice giant Uranus.

In a time of low-resolution astronomy, these nebulous objects appeared to resemble giant planets swimming in a dark cosmos.

A Sun-like star spends most of its life converting hydrogen into helium in its core.
In its twilight years the star runs out of fuel and becomes unbalanced; it can no longer resist the inward crush of gravity and the core begins to collapse.
The temperature in the core rises dramatically while the cooler outer layers expand, causing the entire star to bloat into a red giant.
When the Sun begins its transformation into a red giant it will expand to completely engulf the innermost planets and possibly also the Earth, growing to over 250 times its current radius.
Strong winds then expel the gaseous outer layers of the star, forming a shell of gas that spreads out into the vastness of space.
The red giant’s venting atmosphere will eventually expose its hot, luminous remnant core, which will emit fierce UV radiation and ionise the surrounding gas.


Sky plot

Sky plot


Abell 24 Planetary Nebula, 


            Jerry Macon