Hemisphere:  Northern  ·  Constellation: Auriga (Aur)  ·  Contains:  B25  ·  PK158+00.1  ·  Sh2-216  ·  Sh2-217  ·  Sh2-219  ·  Sh2-221

Image of the day 09/11/2020

Getting plate-solving status, please wait...
    Sh2-216 - Sh2-221, 


            Jeffrey K Lovelace
    Powered byPixInsight

    Imaging telescopes or lenses: Takahashi FSQ-106

    Imaging cameras: FLI ML-16070M

    Mounts: Software Bisque Paramount MyT

    Guiding telescopes or lenses: Stellarvue F50

    Guiding cameras: ZWO ASI174mm Mini

    Focal reducers: Takahashi 645 QE 0.72x Reducer for FSQ106

    Software: Sequence Generator Pro V3.0  ·  Photoshop CC  ·  PixInsight Processing Software  ·  Open PHD Guiding PHD2 Guiding  ·  The SkyX

    Filters: Astrodon O-III 50mm round 3nm  ·  Astrodon S-II 50mm round 3nm  ·  Astrodon Hα 50mm round 5nm  ·  Astrodon B 50mm round E Series  ·  Astrodon G 50mm round E Series  ·  Astrodon R 50mm round E Series

    Accessory: Optec Gemini Focusing Rotator  ·  FLI CFW-2-7 50mm round 7 position filter wheel

    Astrodon B 50mm round E Series: 24x300" -25C bin 1x1
    Astrodon G 50mm round E Series: 24x300" -25C bin 1x1
    Astrodon Hα 50mm round 5nm: 22x1200" -25C bin 1x1
    Astrodon O-III 50mm round 3nm: 16x1200" -25C bin 1x1
    Astrodon R 50mm round E Series: 24x300" -25C bin 1x1
    Astrodon S-II 50mm round 3nm: 16x1200" -25C bin 1x1

    Integration: 24.0 hours

    Darks: ~25

    Flats: ~25

    Bias: ~50

    Bortle Dark-Sky Scale: 1.00

    Mean SQM: 22.00

    Astrometry.net job: 3819054

    RA center: 4h 51' 41"

    DEC center: +46° 50' 8"

    Pixel scale: 13.039 arcsec/pixel

    Orientation: -0.071 degrees

    Field radius: 3.260 degrees

    Resolution: 1500x997

    Data source: Own remote observatory

    Remote source: Sierra Remote Observatories


    Light frames were acquired between August 30th and October 30th 2019.
    Narrowband color: HSO
    Stars: RGB
    Stars’ Lifecycles Play Out in One Patch of Sky

    Sh2-221 and Sh2-216 resulted from different types of star deaths. Sh2-221, at an approximate age of 6,000 years old, is a supernova remnant (SNR). The planetary nebula (PN) Sh2-216, aged at nearly 500,000 years old, has grown exceedingly dim, and its fuzzy edges indicate that it is beginning to dissipate. SNR Sh2-221 is roughly 2,600 ly away and about 130 ly across, while PN Sh2-216 is approximately 400 ly away and 11 ly wide. Therefore, PN Sh2-216 is much closer and smaller in actual size than SNR Sh2-221.

    Sh2-217, Sh2-219, and BFS 44; the three smaller emission nebulae, are all part of the same star forming region.