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MWP1 Motch-Werner-Pakull 1- Methuselah Nebula

Technical card

Resolution: 5545x4132

Dates:July 9, 2019July 10, 2019

Astrodon 36mm Ha (5nm) OIII (5nm): 75x300" (gain: 99.00) -16C bin 1x1
Astrodon Gen 2 L 36mm: 62x60" (gain: 99.00) -12C bin 1x1
Astrodon Gen 2 RGB 36mm: 61x60" (gain: 99.00) -12C bin 1x1

Integration: 8.3 hours

Avg. Moon age: 7.96 days

Avg. Moon phase: 56.09%

Bortle Dark-Sky Scale: 4.00

Temperature: 10.00 job: 2818298

RA center: 319.277 degrees

DEC center: 34.215 degrees

Pixel scale: 0.565 arcsec/pixel

Orientation: 357.874 degrees

Field radius: 0.543 degrees

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

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Images from the following two scopes (piggybacked) contributed to this image:
AG12+ASI1600MM at .70 asec/pix (Ha,OIII)
TV127is+ASI183MM at .75 asec/pix. (LRGB,Ha,OIII)
They were all registered to the best Ha image taken on the AG12.

MWP1 Motch-Werner-Pakull 1, also commonly known as the Methuselah Nebula, is a lovely bi-polar nebula not commonly imaged, despite its rather large size.

Description published in Astronomy Magazine, March, 2011, page 70
MWP1 (Motch, Werner Pakull), PNG 80.8-10.6, is an ancient, bipolar planetary nebula located in Cygnus with a distance of 1400 light years. MWP1 is one of the largest known PNe. It has an apparent size of 13’x 9' and an estimated age of 150,000 years. It is a challenge for scientists studying its evolutionary history because its expansion time of 150,000 years (if an expansion velocity of 20 km/s is assumed) is at least two orders of magnitude longer than the time since the central star’s departure from the AGB (about 1000 years). One possible explanation for this discrepancy may be found in the born-again post-AGB nature of the central star: A late He-shell flash at already declining luminosity brings back the star to the AGB and it experiences a second, He-burning, post-AGB phase on a three times longer time scale. However, a “normal” PN will disperse in about 20 000 years below the detection limit and hence, MWP1 has to have extraordinary parameters. It is also rare, being a bipolar nebula, in which account for about 10% of young PNe. It is also interacting with the interstellar medium. A bipolar structure may suggest that there is a close binary central star or one that has a significant magnetic field. The central star, RX J2117.1+3412, is also a pulsating GW Vir star.



Jerry Macon

Sky plot

Sky plot


MWP1 Motch-Werner-Pakull 1- Methuselah Nebula, 


            Jerry Macon