Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  Checkmark Nebula  ·  Lobster Nebula  ·  M 17  ·  M17  ·  NGC 6618  ·  Omega nebula  ·  Sh2-45  ·  Swan Nebula  ·  omega Nebula
Getting plate-solving status, please wait...
M17 - ESO / MPI-A / OAC + HST / Subaru on version B, 


            Roberto Colombari
Powered byPixInsight

M17 - ESO / MPI-A / OAC + HST / Subaru on version B

Technical card

Astrometry.net job: 4031768

RA center: 18h 21' 2"

DEC center: -16° 9' 56"

Pixel scale: 3.022 arcsec/pixel

Orientation: -0.021 degrees

Field radius: 0.364 degrees

Resolution: 620x604


Version B: R. Gendler + R. Colombari ESO / MPI-A / OAC / Subaru / HST


This is a RGB composition built with frames that the Wide Field Imager (WFI), mounted in the Cassegrain focus of the La Silla 2.2-m MPG/ESO telescope, recorded in 2013.

The filters that have been used are: Rc, V and B.

The mosaic has been created using approximately 96 frames calibrated with 168 bias and 120 sky flat.

Data: ESO / Max-Planck-Institut für Astronomie, Heidelberg / Osservatorio Astronomico di Capodimonte, Napoli

Assembling and processing: R. Colombari


Raw data can be searched and downloaded here: http://archive.eso.org/eso/eso_archive_main.html


The Omega Nebula is between 5,000 and 6,000 light-years from Earth and it spans some 15 light-years in diameter. The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter and has a mass of 30,000 solar masses.[3] The total mass of the Omega Nebula is an estimated 800 solar masses.[4]

It is considered one of the brightest and most massive star-forming regions of our galaxy.[3] Its local geometry is similar to the Orion Nebula except that it is viewed edge-on rather than face-on.[5]

The open cluster NGC 6618 lies embedded in the nebulosity and causes the gases of the nebula to shine due to radiation from these hot, young stars; however, the actual number of stars in the nebula is much higher - up to 800, 100 of spectral type earlier than B9, and 9 of spectral type O, plus over a thousand stars in formation on its outer regions.[3] It is also one of the youngest clusters known, with an age of just 1 million years.[6]

The luminous blue variable HD 168607, located in the south-east part of the Omega nebula, is generally assumed to be associated with it; its close neighbor, the blue hypergiant HD 168625, may be too.

The Swan portion of M17, the Omega Nebula in the Sagittarius nebulosity is said to resemble a barber’s pole.[7]

Source: Wikipedia



  • M17 - ESO / MPI-A / OAC + HST / Subaru on version B, 


            Roberto Colombari
  • Final
    M17 - ESO / MPI-A / OAC + HST / Subaru on version B, 


            Roberto Colombari

Sky plot

Sky plot


M17 - ESO / MPI-A / OAC + HST / Subaru on version B, 


            Roberto Colombari

In these public groups

Imagers of Italy