Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  HD312582  ·  NGC 6537  ·  Red Spider Nebula
Getting plate-solving status, please wait...
Red Spider Nebula, 


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Red Spider Nebula

Getting plate-solving status, please wait...
Red Spider Nebula, 


Powered byPixInsight

Red Spider Nebula

Acquisition details

June 25, 2022 ·  June 27, 2022 ·  June 30, 2022 ·  July 1, 2022
Astrodon Gen2 E-Series Tru-Balance Blue: 6×300(30′) (gain: 100.00) -5°C bin 2×2
Astrodon Gen2 E-Series Tru-Balance Green: 12×300(1h) (gain: 100.00) -5°C bin 2×2
Astrodon Gen2 E-Series Tru-Balance Red: 12×300(1h) (gain: 100.00) -5°C bin 2×2
Astrodon H-alpha 5nm: 26×600(4h 20′) (gain: 100.00) -5°C bin 2×2
Astrodon OIII 5nm: 24×600(4h) (gain: 100.00) -5°C bin 2×2
10h 50′
Flat darks:
Avg. Moon age:
14.44 days
Avg. Moon phase:
Mean SQM:
Mean FWHM:

RA center: 18h05m13s.639

DEC center: -19°5035.10

Pixel scale: 0.196 arcsec/pixel

Orientation: 0.919 degrees

Field radius: 0.101 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 2916x2329

File size: 1.0 MB

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard


Capturing detail for this interesting object was a challenge due to its relatively small size. Most of the detail is in the Ha. Fortunately I was able to capture 26 10-min Ha subs between 1.7" and 2.3". Both Ha and OIII were combined, stars removed and RGB stars inserted. 2X dithering used.

"The Red Spider Nebula (NGC 6537) is a planetary nebula located near the heart of the Milky Way, in the northwest of the constellation Sagittarius. The nebula has a prominent two-lobed shape, possibly due to a binary companion or magnetic fields and has an S-shaped symmetry of the lobes – the lobes opposite each other appear similar. This is believed to be due to the presence of a companion to the central white dwarf. However, the gas walls of the two lobed structures are not at all smooth, but rather are rippled in a complex way.

The central white dwarf, the remaining compact core of the original star, produces a powerful and hot (≈10,000 K) wind blowing with a speed of 300 kilometers per second, which has generated waves 100 billion kilometres high. The waves are generated by supersonic shocks formed when the local gas is compressed and heated in front of the rapidly expanding lobes. Atoms caught in the shocks radiate a visible light. These winds are what give this nebula its unique 'spider' shape and also contribute to the expansion of the nebula.

The star at the center of the Red Spider Nebula is surrounded by a dust shell making its exact properties hard to determine. Its surface temperature is probably 150,000–250,000 K, although a temperature of 340,000 K or even 500,000 K is not ruled out, making it among the hottest white dwarf stars known.

The Red Spider Nebula lies near the constellation of Sagittarius. Its distance has been variously estimated as 1,900 light-year or, more likely, 3,000–8,000 light-years."


Sky plot

Sky plot


Red Spider Nebula,