BD+21 2934B, IDS 16260+2142 B, WDS 16302+2129B. ...
The angular direction of one body with respect to another; measured from north toward the east; typically used in the study of visual binaries.
The angle on the sky between two objects, such as the components of a double star. It is measured north - east and south - west, from 0 to 360º.
Angular distance (in degrees, measured from north through east) between the primary and secondary components of a binary system.
For a binary star, the position angle isthe angle (measured counterclockwise) at the brighter star between a linedrawn due north to a linedrawn to the fainter star.
P-angle: The between the geocentric north pole and the solar rotational north pole measured eastward from geocentric north. The range in P is plus or minus 26.31°.
position angle (NASA SP-7, 1965) = parallactic angle. position angle (PA) (Comet Glossary - JPL) The PA of a tail or other cometary feature represents the direction on the sky (in degrees from north) toward which it is pointing.
Also called . parallactic inequality A secondary effect in the solar perturbations in the moon's longitude due to the ellipticity of the earth's orbit.
According to Roland Wielen (1962; see Brs 13 on page 603), who used a computer to mathematically iterate (photographic observations in both coordinates and visual observations of the position angle) to "best fit" estimates, ...
The tail was 3 arcminutes long in 70. The following evening I managed to see the comet in the twilight, ten minutes after sunset. V1 NEAT appeared like a small white patch lapping over the blue sky.
The separation never changes much from its current distance of only 0.2". Its 2000.0 position angle is 132º.
Much easier to resolve is component E, with a visual magnitude of 6.
A protractor shown is shown behind the black box and is free to rotate 360 degrees to measure the of the double stars.
also need the orbital period P and some sort of initial point, say the time T when the star was at "perihelion".) From the apparent orbit we can determine 5 parameters: the eccentricity and semimajor axis of the apparent orbit, the position angle of ...
It is also the first to implement the "eyepiece view," with deep sky objects plotted to scale and galaxies rotated to show . This is an extremely detailed visual sky atlas program with too many features to mention here.
In some, the position angles of the major axes of the isophotes are also a function of the isophotal level; that is, such galaxies possess an isophotal twist.
This star is probably very young and not quite yet completely at the stable main sequence stage. Look for a companion 12.8" distant at 153o. The area around V427 Mon is populated with dozens of Orion variables.
This can be seen in Fig. 1 of Zensus et al. (1995 ApJ 443, 35, courtesy of the AAS) in which a new component appears in late 1985, brightens, and moves outward changing its relative position angle in the process: ...
See also: Sky, Astro, Orbit, Star, Earth