galpy.util.bovy_coords.cov_dvrpmllbb_to_vxyz¶
-
galpy.util.bovy_coords.
cov_dvrpmllbb_to_vxyz
(d, e_d, e_vr, pmll, pmbb, cov_pmllbb, l, b, plx=False, degree=False)¶ NAME:
cov_dvrpmllbb_to_vxyzPURPOSE:
propagate distance, radial velocity, and proper motion uncertainties to Galactic coordinatesINPUT:
d - distance [kpc, as/mas for plx]
e_d - distance uncertainty [kpc, [as/mas] for plx]
e_vr - low velocity uncertainty [km/s]
pmll - proper motion in l (*cos(b)) [ [as/mas]/yr ]
pmbb - proper motion in b [ [as/mas]/yr ]
cov_pmllbb - uncertainty covariance for proper motion [pmll is pmll x cos(b)]
l - Galactic longitude
b - Galactic lattitude
KEYWORDS:
plx - if True, d is a parallax, and e_d is a parallax uncertainty
degree - if True, l and b are given in degree
OUTPUT:
cov(vx,vy,vz) [3,3] or [:,3,3]HISTORY:
2010-04-12 - Written - Bovy (NYU)