NovasTransformHip Method
Convert Hipparcos catalog data at epoch J1991.25 to epoch J2000.0, for use within NOVAS.
Namespace: ASCOM.Tools.Novas31Assembly: ASCOM.AstrometryTools (in ASCOM.AstrometryTools.dll) Version: 3.0.0-rc.1+86c25ce733aebb4d8b1b8a62e84770ea5e972bea
public static void TransformHip(
CatEntry3 Hipparcos,
ref CatEntry3 Hip2000
)
Public Shared Sub TransformHip (
Hipparcos As CatEntry3,
ByRef Hip2000 As CatEntry3
)
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
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
>
Supported in: 2.0