File:Planetary nebula NGC 40 (nao-ngc40).tiff
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Planetary_nebula_NGC_40_(nao-ngc40).tiff (400 × 400 pixels, file size: 137 KB, MIME type: image/tiff)
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DescriptionPlanetary nebula NGC 40 (nao-ngc40).tiff |
English: This is a ten-second exposure taken on the night of September 1st 1994 (UT of observation 02/09/94:06:15). This photograph shows a region 100 arc seconds square. The image has been compressed in brightness (approximately a double logarithm) to show both bright and faint features. Observing conditions were not very good during this phase of commissioning, so that this image has a "seeing" measurement (average FWHM of several stars) of about 1.0 arc seconds. Orientation: N is up, with W to the left. About this object Planetary nebula NGC 40 is a low-excitation nebula in the constellation of Cepheus, about 4000 light-years away from Earth. The central star is fairly bright (about magnitude 11.6), has a mass of around 0.7 solar masses, and is much hotter than would be expected just from the properties of the surrounding nebula. This is because its temperature of around 90000 degrees should be hot enough to excite the nebula to a much higher ionization state than is found. This suggests the presence of shielding material between the star and the glowing nebula. Such higher density material could form in the shock interface between the fast wind (about 1800 km/s) from the central star and the nebular shells themselves. The nebular material covers about 25% of the sky as viewed by the central star, implying rather asymmetric mass-loss from the star in its asymptotic giant branch stage. NGC 40 has an extended halo, not seen here, probably caused by earlier mass ejection. Location: 00 13.0 +72 32 (2000), size: about 0.6 light-years across. |
Date | 30 June 2020, 21:34:00 (upload date) |
Source | Planetary nebula NGC 40 |
Author | WIYN/NOIRLab/NSF |
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This media was created by the National Optical-Infrared Astronomy Research Laboratory (NOIRLab).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public NOIRLab website, along with the texts of press releases, announcements, images of the week and captions; are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible." To the uploader: You must provide a link (URL) to the original file and the authorship information if available. | |
This file is licensed under the Creative Commons Attribution 4.0 International license.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:54, 17 September 2023 | 400 × 400 (137 KB) | OptimusPrimeBot (talk | contribs) | #Spacemedia - Upload of https://noirlab.edu/public/media/archives/images/original/nao-ngc40.tif via Commons:Spacemedia |
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Image title | This is a ten-second exposure taken on the night of September 1st 1994 (UT of observation 02/09/94:06:15). This photograph shows a region 100 arc seconds square. The image has been compressed in brightness (approximately a double logarithm) to show both bright and faint features. Observing conditions were not very good during this phase of commissioning, so that this image has a "seeing" measurement (average FWHM of several stars) of about 1.0 arc seconds. Orientation: N is up, with W to the left. About this object Planetary nebula NGC 40 is a low-excitation nebula in the constellation of Cepheus, about 4000 light-years away from Earth. The central star is fairly bright (about magnitude 11.6), has a mass of around 0.7 solar masses, and is much hotter than would be expected just from the properties of the surrounding nebula. This is because its temperature of around 90000 degrees should be hot enough to excite the nebula to a much higher ionization state than is found. This suggests the presence of shielding material between the star and the glowing nebula. Such higher density material could form in the shock interface between the fast wind (about 1800 km/s) from the central star and the nebular shells themselves. The nebular material covers about 25% of the sky as viewed by the central star, implying rather asymmetric mass-loss from the star in its asymptotic giant branch stage. NGC 40 has an extended halo, not seen here, probably caused by earlier mass ejection. Location: 00 13.0 +72 32 (2000), size: about 0.6 light-years across. |
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Width | 400 px |
Height | 400 px |
Bits per component | 8 |
Compression scheme | LZW |
Pixel composition | Palette |
Image data location | 22,646 |
Orientation | Normal |
Number of components | 1 |
Number of rows per strip | 400 |
Bytes per compressed strip | 112,694 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CC 2019 (Windows) |
File change date and time | 19:13, 14 December 2019 |
Color space | Uncalibrated |
Structured data
image/tiff
400 pixel
400 pixel
140,572 byte
ab36bf9ba570c2f7aff6a44f18eb9776063f15ac
30 June 2020
2txuj0j7sikt64spm8cg2wmatcd3pthndyq9e71xsi42tmtk0m
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