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"title": "The Alternative Night Sky - Another Time - Another Place",
"description": "A low-magnitude threshold version of the skymap. The threshold magnitude is 3.0 so the galactic disk is very faint. Good for when you just want the brighter stars and have a wide field of view. || RandomizedSkymap.t3_04096x02048_print.jpg (1024x512) [157.4 KB] || RandomizedSkymap.t3_04096x02048_searchweb.png (320x180) [78.0 KB] || RandomizedSkymap.t3_04096x02048_thm.png (80x40) [4.1 KB] || RandomizedSkymap.t3_04096x02048.tif (4096x2048) [24.0 MB] || RandomizedSkymap.t3_08192x04096.tif (8192x4096) [96.0 MB] || ",
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"update_date": "2023-05-03T13:47:30.591412-04:00",
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"employer": "Global Science and Technology, Inc."
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"description": "Periodically our group needs to generate visualizations of another location in the galaxy, or another time in the galaxy. For context to make the view more appealing, we might like to include background stars - but showing our standard view of the night sky from Earth just seems not quite right. And then there are some (like this author) who sometimes want to make a big deal about such details, so why don't I just solve the problem.
This texture is built from the Tycho Catalog skymap. The same stars are included, but the brighter stars are repositioned by computing a random offset from their usual positions. This alters the star patterns to less recognizable forms while keeping groups of fainter stars, such as the Milky Way, intact. This technique does keep a number of the dust lanes in the galactic disk intact.",
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"description": "A higher-magnitude threshold version of the skymap. The threshold magnitude is 4.0 so the galactic plane is fainter and bright stars are smaller than the map above. Better for smaller fields-of-view.",
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"description": "A high-magnitude threshold (almost all stars visible to the naked eye) version of the skymap. The threshold magnitude is 5.0 so the galactic plane is very bright and bright stars are large. Best for smaller camera fields of view to show fainter stars. ",
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{
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{
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"alt_text": "A high-magnitude threshold (almost all stars visible to the naked eye) version of the skymap. The threshold magnitude is 5.0 so the galactic plane is very bright and bright stars are large. Best for smaller camera fields of view to show fainter stars. ",
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"funding_sources": [
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],
"credits": [
{
"role": "Visualizer",
"people": [
{
"name": "Tom Bridgman",
"employer": "Global Science and Technology, Inc."
},
{
"name": "Ernie Wright",
"employer": "USRA"
}
]
},
{
"role": "Technical support",
"people": [
{
"name": "Ian Jones",
"employer": "ADNET Systems, Inc."
},
{
"name": "Laurence Schuler",
"employer": "ADNET Systems, Inc."
}
]
}
],
"missions": [],
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],
"tapes": [],
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"datasets": [
{
"name": "Hipparcos Catalogue",
"common_name": "",
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"sensor": "Telescope",
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"credit": "",
"url": "http://www.rssd.esa.int/index.php?project=HIPPARCOS",
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{
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"common_name": "Tycho Catalogue",
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],
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],
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"related": [
{
"id": 3572,
"url": "https://svs.gsfc.nasa.gov/3572/",
"page_type": "Visualization",
"title": "The Tycho Catalog Skymap - Version 2.0",
"description": "This image set is a skymap of stars from the Tycho and Hipparcos star catalogs, provided by the ESO/ECF generic catalog server. The maps are plotted in plate carrée projection (Cylindrical-Equidistant) using celestial coordinates making them suitable for mapping onto spheres in many popular animation programs. The stars are plotted as gaussian point-spread functions (PSF) so the size and amplitude of the stars corresponds to their relative intensity. The stars are also elongated in Right Ascension (celestial longitude) based on declination (celestial latitude) so stars in the polar regions will still be round when projected on a sphere. Stars fainter than the threshold magnitude, usually selected as 5th magnitude, have their magnitude-intensity curve adjusted so they appear brighter than they really are. This makes the band of the Milky Way more visible. Stellar colors are assigned based on B and V magnitudes (B and V are stellar magnitudes measured through different filters). If Johnson B and V magnitudes are unavailable, Tycho B and V magnitudes are used instead. From these, an effective stellar temperature is derived using the algorithms described in Flower (ApJ 469, 355 1996). Corrections were noted from Siobahn Morgan (UNI). The effective temperature was then converted to CIE tristimulus X,Y,Z triples assuming a black-body emission distribution. The X,Y,Z values are then converted to red-green-blue color pixels. About 2.4 million stars are plotted, but many may be below the pixel intensity resolution. The three most conspicuously missing objects on these maps are the Andromeda galaxy (M31) and the two Magellanic Clouds. Changes from the first version #3442, The Tycho Catalog Skymap: The star generation algorithm now favors use of the Johnson magnitudes when available. This improves the star colors over the previous method. The star intensity profiles are also slightly modified to make the cores brighter with a faster intensity falloff. We have also set the color standard to SMPTE with a gamma of 1.8.Update: This skymap has been revised. The newer version is available at Deep Star Maps. || ",
"release_date": "2009-01-26T00:00:00-05:00",
"update_date": "2023-05-03T13:54:57.462937-04:00",
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"media_type": "Image",
"alt_text": "This movie is a sample tour of the skymap. It starts looking at the North Celestial Pole (the Little Dipper is visible). We then make short trips to the Big Dipper, the Summer Triangle (Cygnus, Lyra, and Aquila), the Orion and Taurus region, southward to Canis Major, and over to Scorpius and Saggitarius. The movie ends pointed at the South Celestial Pole (the Southern Cross is visible to the right).",
"width": 1280,
"height": 720,
"pixels": 921600
}
}
],
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"products": [],
"newer_versions": [
{
"id": 4856,
"url": "https://svs.gsfc.nasa.gov/4856/",
"page_type": "Visualization",
"title": "An Elsewhere Starfield",
"description": "The randomized star map in celestial coordinates, at five different resolutions. (Or more generically: The galactic plane is tilted 63° in the coordinate frame of the image.) || starmap_random_2020_4k_print.jpg (1024x512) [37.1 KB] || starmap_random_2020_4k_searchweb.png (320x180) [67.0 KB] || starmap_random_2020_4k_thm.png (80x40) [4.3 KB] || starmap_random_2020_4k.exr (4096x2048) [34.1 MB] || starmap_random_2020_8k.exr (8192x4096) [123.8 MB] || starmap_random_2020_16k.exr (16384x8192) [423.3 MB] || starmap_random_2020_32k.exr (32768x16384) [1.4 GB] || starmap_random_2020_64k.exr (65536x32768) [3.8 GB] || ",
"release_date": "2020-09-09T13:00:00-04:00",
"update_date": "2023-05-03T13:44:43.323226-04:00",
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"id": 382801,
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"media_type": "Image",
"alt_text": "The randomized star map in celestial coordinates, at five different resolutions. (Or more generically: The galactic plane is tilted 63° in the coordinate frame of the image.)",
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}
}
],
"older_versions": [],
"alternate_versions": []
}