NovasTransformHip Method

Convert Hipparcos catalog data at epoch J1991.25 to epoch J2000.0, for use within NOVAS.

Definition

Namespace: ASCOM.Tools.Novas31
Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 3.0.0-rc.1+86c25ce733aebb4d8b1b8a62e84770ea5e972bea
C#
public static void TransformHip(
	CatEntry3 Hipparcos,
	ref CatEntry3 Hip2000
)

Parameters

Hipparcos  CatEntry3
An entry from the Hipparcos catalog, at epoch J1991.25, with all members having Hipparcos catalog units. See Note 1 below
Hip2000  CatEntry3
The transformed input entry, at epoch J2000.0. See Note 2 below

Remarks

To be used only for Hipparcos or Tycho stars with linear space motion. Both input and output data is in the ICRS.

1. Input (Hipparcos catalog) epoch and units:

  • Epoch: J1991.25
  • Right ascension (RA): degrees
  • Declination (Dec): degrees
  • Proper motion in RA: milli-arcseconds per year
  • Proper motion in Dec: milli-arcseconds per year
  • Parallax: milli-arcseconds
  • Radial velocity: kilometers per second (not in catalog)

2. Output (modified Hipparcos) epoch and units:

  • Epoch: J2000.0
  • Right ascension: hours
  • Declination: degrees
  • Proper motion in RA: milli-arcseconds per year
  • Proper motion in Dec: milli-arcseconds per year
  • Parallax: milli-arcseconds
  • Radial velocity: kilometers per second
>

Version Information

.NET Standard

Supported in: 2.0

See Also