A Dark Hollow Keyhole-Shaped Reflection Nebula “NGC 1999” Photographed by Hubble | sorae Portal site to space


This is the constellation of Orion, which is about 1,350 light years away.Reflection Nebula “NGC 1999”A reflection nebula is a collection of gas and dustMolecular clouds reflect starlightA nebula that appears to glow when It is a different type of nebula than the emission nebula that glows with the light of ionized gas.

In the case of NGC 1999, a young star near the center“V380 Orionis”Light is reflected by According to the European Space Agency (ESA), the gas and dust that make up NGC 1999 are residual material from the formation of V380 Orionis.

Most notable is the dark area visible near the center of NGC 1999. Due to its shape, the ESA“Cosmic keyhole”is expressed.

in 2000“Hubble”At the time the NGC 1999 images taken by the space telescope were released, this part was“Globule of Bok”it was thought to be Bock’s globules are dark nebulae seen in the HII region and are relatively small molecular clouds with a high density of gas and dust. A dense molecular cloud containing dust was thought to block visible light, making it appear dark.

connection:Young stars and dark clouds floating in a sea of ​​red light, the emission nebula in the constellation Centaurus

But then it was managed by ESA“Hershel”Using a space telescope to observe NGC 1999 at infrared wavelengths, this part isapparently emptyIt was revealed in 2010 that it seems likely that the NGC 1999 cavity was formed by jets and radiation from young stars born in this region.

The image above was once aboard the Hubble Space Telescope.“Wide Area Planetary Camera 2 (WFPC2)”and the Paranal Observatory (Chile) managed by the European Southern Observatory (ESO)“VLT detection telescope (VST)”Wide angle camera installed「OmegaCAM」It was created based on the image (using a total of 6 types of visible light filters) acquired using, and was released by ESA on 24 October 2022 as an image from this week’s Hubble Space Telescope.

connection:“Her Big Halo Objects” by Orion HH 1 and HH 2


  • Image credit: ESA / Hubble and NASA, K. Noll
  • ESA / Hubble – Cosmic keyhole

Text / Matsumura Takehiro

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