Gaia Star Catalog
A 5M row sample of the 1.8B element Gaia star catalog. A raster sky map reveals our Milky Way galaxy. Select high parallax stars in the histogram to reveal a Hertzsprung-Russel diagram in the plot of stellar color vs. magnitude on the right.
You may need to wait a few seconds for the dataset to load.
Loading Example... ⏳
Specification
js
import * as vg from "@uwdata/vgplot";
await vg.coordinator().exec([
`CREATE TEMP TABLE IF NOT EXISTS gaia AS -- compute u and v with natural earth projection
WITH prep AS (
SELECT
radians((-l + 540) % 360 - 180) AS lambda,
radians(b) AS phi,
asin(sqrt(3)/2 * sin(phi)) AS t,
t^2 AS t2,
t2^3 AS t6,
*
FROM 'https://uwdata.github.io/mosaic-datasets/data/gaia-5m.parquet'
)
SELECT
(1.340264 * lambda * cos(t)) / (sqrt(3)/2 * (1.340264 + (-0.081106 * 3 * t2) + (t6 * (0.000893 * 7 + 0.003796 * 9 * t2)))) AS u,
t * (1.340264 + (-0.081106 * t2) + (t6 * (0.000893 + 0.003796 * t2))) AS v,
* EXCLUDE('t', 't2', 't6')
FROM prep
WHERE parallax BETWEEN -5 AND 20`
]);
const $brush = vg.Selection.crossfilter();
const $bandwidth = vg.Param.value(0);
const $pixelSize = vg.Param.value(2);
const $scaleType = vg.Param.value("sqrt");
export default vg.hconcat(
vg.vconcat(
vg.plot(
vg.raster(
vg.from("gaia", {filterBy: $brush}),
{
x: "u",
y: "v",
fill: "density",
bandwidth: $bandwidth,
pixelSize: $pixelSize
}
),
vg.intervalXY({pixelSize: 2, as: $brush}),
vg.xyDomain(vg.Fixed),
vg.colorScale($scaleType),
vg.colorScheme("viridis"),
vg.width(440),
vg.height(250),
vg.marginLeft(25),
vg.marginTop(20),
vg.marginRight(1)
),
vg.hconcat(
vg.plot(
vg.rectY(
vg.from("gaia", {filterBy: $brush}),
{
x: vg.bin("phot_g_mean_mag"),
y: vg.count(),
fill: "steelblue",
inset: 0.5
}
),
vg.intervalX({as: $brush}),
vg.xDomain(vg.Fixed),
vg.yScale($scaleType),
vg.yGrid(true),
vg.width(220),
vg.height(120),
vg.marginLeft(65)
),
vg.plot(
vg.rectY(
vg.from("gaia", {filterBy: $brush}),
{x: vg.bin("parallax"), y: vg.count(), fill: "steelblue", inset: 0.5}
),
vg.intervalX({as: $brush}),
vg.xDomain(vg.Fixed),
vg.yScale($scaleType),
vg.yGrid(true),
vg.width(220),
vg.height(120),
vg.marginLeft(65)
)
)
),
vg.hspace(10),
vg.plot(
vg.raster(
vg.from("gaia", {filterBy: $brush}),
{
x: "bp_rp",
y: "phot_g_mean_mag",
fill: "density",
bandwidth: $bandwidth,
pixelSize: $pixelSize
}
),
vg.intervalXY({pixelSize: 2, as: $brush}),
vg.xyDomain(vg.Fixed),
vg.colorScale($scaleType),
vg.colorScheme("viridis"),
vg.yReverse(true),
vg.width(230),
vg.height(370),
vg.marginLeft(25),
vg.marginTop(20),
vg.marginRight(1)
)
);yaml
meta:
title: Gaia Star Catalog
description: |
A 5M row sample of the 1.8B element Gaia star catalog.
A `raster` sky map reveals our Milky Way galaxy. Select high parallax stars in the histogram to reveal a
[Hertzsprung-Russel diagram](https://en.wikipedia.org/wiki/Hertzsprung%E2%80%93Russell_diagram)
in the plot of stellar color vs. magnitude on the right.
_You may need to wait a few seconds for the dataset to load._
data:
gaia: |
-- compute u and v with natural earth projection
WITH prep AS (
SELECT
radians((-l + 540) % 360 - 180) AS lambda,
radians(b) AS phi,
asin(sqrt(3)/2 * sin(phi)) AS t,
t^2 AS t2,
t2^3 AS t6,
*
FROM 'https://uwdata.github.io/mosaic-datasets/data/gaia-5m.parquet'
)
SELECT
(1.340264 * lambda * cos(t)) / (sqrt(3)/2 * (1.340264 + (-0.081106 * 3 * t2) + (t6 * (0.000893 * 7 + 0.003796 * 9 * t2)))) AS u,
t * (1.340264 + (-0.081106 * t2) + (t6 * (0.000893 + 0.003796 * t2))) AS v,
* EXCLUDE('t', 't2', 't6')
FROM prep
WHERE parallax BETWEEN -5 AND 20
params:
brush: { select: crossfilter }
bandwidth: 0
pixelSize: 2
scaleType: sqrt
hconcat:
- vconcat:
- plot:
- mark: raster
data: { from: gaia, filterBy: $brush }
x: u
y: v
fill: density
bandwidth: $bandwidth
pixelSize: $pixelSize
- select: intervalXY
pixelSize: 2
as: $brush
xyDomain: Fixed
colorScale: $scaleType
colorScheme: viridis
width: 440
height: 250
marginLeft: 25
marginTop: 20
marginRight: 1
- hconcat:
- plot:
- mark: rectY
data: { from: gaia, filterBy: $brush }
x: { bin: phot_g_mean_mag }
y: { count: }
fill: steelblue
inset: 0.5
- select: intervalX
as: $brush
xDomain: Fixed
yScale: $scaleType
yGrid: true
width: 220
height: 120
marginLeft: 65
- plot:
- mark: rectY
data: { from: gaia, filterBy: $brush }
x: { bin: parallax }
y: { count: }
fill: steelblue
inset: 0.5
- select: intervalX
as: $brush
xDomain: Fixed
yScale: $scaleType
yGrid: true
width: 220
height: 120
marginLeft: 65
- hspace: 10
- plot:
- mark: raster
data: { from: gaia, filterBy: $brush }
x: bp_rp
y: phot_g_mean_mag
fill: density
bandwidth: $bandwidth
pixelSize: $pixelSize
- select: intervalXY
pixelSize: 2
as: $brush
xyDomain: Fixed
colorScale: $scaleType
colorScheme: viridis
yReverse: true
width: 230
height: 370
marginLeft: 25
marginTop: 20
marginRight: 1json
{
"meta": {
"title": "Gaia Star Catalog",
"description": "A 5M row sample of the 1.8B element Gaia star catalog.\nA `raster` sky map reveals our Milky Way galaxy. Select high parallax stars in the histogram to reveal a\n[Hertzsprung-Russel diagram](https://en.wikipedia.org/wiki/Hertzsprung%E2%80%93Russell_diagram)\nin the plot of stellar color vs. magnitude on the right.\n\n_You may need to wait a few seconds for the dataset to load._\n"
},
"data": {
"gaia": "-- compute u and v with natural earth projection\nWITH prep AS (\n SELECT\n radians((-l + 540) % 360 - 180) AS lambda,\n radians(b) AS phi,\n asin(sqrt(3)/2 * sin(phi)) AS t,\n t^2 AS t2,\n t2^3 AS t6,\n *\n FROM 'https://uwdata.github.io/mosaic-datasets/data/gaia-5m.parquet'\n)\nSELECT\n (1.340264 * lambda * cos(t)) / (sqrt(3)/2 * (1.340264 + (-0.081106 * 3 * t2) + (t6 * (0.000893 * 7 + 0.003796 * 9 * t2)))) AS u,\n t * (1.340264 + (-0.081106 * t2) + (t6 * (0.000893 + 0.003796 * t2))) AS v,\n * EXCLUDE('t', 't2', 't6')\nFROM prep\nWHERE parallax BETWEEN -5 AND 20\n"
},
"params": {
"brush": {
"select": "crossfilter"
},
"bandwidth": 0,
"pixelSize": 2,
"scaleType": "sqrt"
},
"hconcat": [
{
"vconcat": [
{
"plot": [
{
"mark": "raster",
"data": {
"from": "gaia",
"filterBy": "$brush"
},
"x": "u",
"y": "v",
"fill": "density",
"bandwidth": "$bandwidth",
"pixelSize": "$pixelSize"
},
{
"select": "intervalXY",
"pixelSize": 2,
"as": "$brush"
}
],
"xyDomain": "Fixed",
"colorScale": "$scaleType",
"colorScheme": "viridis",
"width": 440,
"height": 250,
"marginLeft": 25,
"marginTop": 20,
"marginRight": 1
},
{
"hconcat": [
{
"plot": [
{
"mark": "rectY",
"data": {
"from": "gaia",
"filterBy": "$brush"
},
"x": {
"bin": "phot_g_mean_mag"
},
"y": {
"count": null
},
"fill": "steelblue",
"inset": 0.5
},
{
"select": "intervalX",
"as": "$brush"
}
],
"xDomain": "Fixed",
"yScale": "$scaleType",
"yGrid": true,
"width": 220,
"height": 120,
"marginLeft": 65
},
{
"plot": [
{
"mark": "rectY",
"data": {
"from": "gaia",
"filterBy": "$brush"
},
"x": {
"bin": "parallax"
},
"y": {
"count": null
},
"fill": "steelblue",
"inset": 0.5
},
{
"select": "intervalX",
"as": "$brush"
}
],
"xDomain": "Fixed",
"yScale": "$scaleType",
"yGrid": true,
"width": 220,
"height": 120,
"marginLeft": 65
}
]
}
]
},
{
"hspace": 10
},
{
"plot": [
{
"mark": "raster",
"data": {
"from": "gaia",
"filterBy": "$brush"
},
"x": "bp_rp",
"y": "phot_g_mean_mag",
"fill": "density",
"bandwidth": "$bandwidth",
"pixelSize": "$pixelSize"
},
{
"select": "intervalXY",
"pixelSize": 2,
"as": "$brush"
}
],
"xyDomain": "Fixed",
"colorScale": "$scaleType",
"colorScheme": "viridis",
"yReverse": true,
"width": 230,
"height": 370,
"marginLeft": 25,
"marginTop": 20,
"marginRight": 1
}
]
}