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| Name / Constellation | Sh2 240 |
Other: Simeis 147 | Tau |
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| Coordinates | AR: 05h 40m - Dec: +27° 00′ | |||
| Optics | Takahashi FSQ 106N APO Fluorite F5 - 60/220 guiding refractor | |||
| Camera-Mount | SBIG STF8300M - Orion StarShot Guider - 10Micron GM2000 QCI Mount | |||
| Filters | Baader Ha-Oxy3_Sul2 | |||
| Exposure |
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total exp. 19 hours |
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| Location / Date | Promiod (Valle D'Aosta-Italy) "TLP" Remote Observatory - Gen 2022 | |||
| Seeing | 2.5-3" @ 2.1 arcosec/pixel unbinned | |||
| Note | Six panel mosaic | |||
| Acquisition | MaxIm DL - CCD Autopilot5 | |||
| Processing | Adobe Photoshop -  |
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| Comment |
Simeis 147 (also known as Sh2-240 or Spaghetti Nebula) is a famous supernova remnant visible in the constellation of Taurus, on the border with Auriga. The nebula appears in the form of very delicate filaments, denser on the south-eastern side and much more rarefied on the western one; they were created by an ancient supernova that exploded about 1470 parsecs (4800 light years) from the Sun, on the Perseus Arm. If the distance measurements are correct, the object would have a real size of 160 light years. The supernova would have exploded about 40,000 years ago, leaving a pulsar towards the southern corner of the object; the star that originated this object was probably a member of the Auriga OB1 association and was therefore linked to the open cluster M36, from which it would have escaped before ending its life cycle. Previous estimates of its distance had given a value of 800 parsecs (about 2600 light-years), thus placing it within the Orion Arm.
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