galaxies: Galaxies

In baddstats/spherstat: Spatial Point Pattern Analysis, Geometry and Trigonometry for the Sphere

Galaxies

Description

Sky positions of 10610 galaxies from the New General Catalogue (NGC).

Usage

data("galaxies"); data("galaxiesband")

Format

The raw dataset galaxies is a data.frame with two columns containing the galactic coordinates longitude (in degrees from 0 to 360) and latitude (in degrees from -90 to 90).

The object galaxiesband is a spherical point pattern (object of class "sp2").

Details

This dataset, extracted from the New General Catalogue (NGC), gives the sky positions of 10610 galaxies, in galactic coordinates.

From the original list of 13957 galaxies given by Steinicke (2015) we have retained only those which lie in the region of space that is not partially obscured by the Milky Way.

The obscured region is taken to be the region lying between the concentric small circles of radius 80 and 95 degrees respectively, with common centre at longitude 187.5 degrees, latitude 25 degrees.

The raw dataset galaxies is a data frame containing the sky positions of the galaxies. The object galaxiesband is a spherical point pattern (object of class "sp2") containing the same points, but also containing a representation of the observable region in the sky.

Source

Steinicke (2015)

References

Steinicke, W. (2015) Revised New General Catalogue and Index Catalogue. Available from www.klima-luft.de/steinicke/index_e.html. Accessed 14 May 2015.

Examples

data(galaxies)
data(galaxiesband)
plot(galaxiesband, eye=c(pi/2, 0))

baddstats/spherstat documentation built on Feb. 6, 2023, 1:45 a.m.