Data access: To be released in July 2021 with SDSS DR17, as a Value-Added Catalog.

Data model for ananke-2a: Gaia-APOGEE synthetic surveys
Quantity Explanation Data type Unit
Fields with names identical to those in DR2
Indices
source_id Unique source identifier (per mock catalog) long
random_index Random index used to select subsets long
Astrometry
ra Right ascension double Angle (deg)
ra_error Standard error of right ascension double Angle (deg)
dec Declination double Angle (deg)
dec_error Standard error of declination double Angle (deg)
parallax Parallax double Angle (mas)
parallax_error Standard error of parallax double Angle (mas)
parallax_over_error Parallax divided by its error float
pmra Proper motion in RA direction double Angular Velocity (mas/year)
pmra_error Standard error of proper motion in RA direction double Angular Velocity (mas/year)
pmdec Proper motion in declination direction double Angular Velocity (mas/year)
pmdec_error Standard error of proper motion in declination direction double Angular Velocity (mas/year)
l Galactic longitude (converted from RA, dec) double Angle (deg)
b Galactic latitude (converted from RA, dec) double Angle (deg)
Photometry
phot_g_mean_mag Extincted apparent G-band mean magnitude float Magnitude (mag)
phot_g_mean_mag_error Standard error of G-band mean magnitude float Magnitude (mag)
phot_bp_mean_mag Extincted apparent GBp-band mean magnitude float Magnitude (mag)
phot_bp_mean_mag_error Standard error of GBp-band mean magnitude float Magnitude (mag)
phot_rp_mean_mag Extincted apparent GRp band mean magnitude float Magnitude (mag)
phot_rp_mean_mag_error Standard error of GRp-band mean magnitude float Magnitude (mag)
bp_rp Reddened GBp–GRp colour float Magnitude (mag)
bp_g Reddened GBp–G colour float Magnitude (mag)
g_rp Reddened G–GRp colour float Magnitude (mag)
a_g_val line-of-sight extinction in the G band, AG float Magnitude (mag)
e_bp_min_rp_val line-of-sight reddening E(GBp-GRp) float Magnitude (mag)
Spectroscopy
radial_velocity Radial velocity double Velocity (km/s)
radial_velocity_error Standard error of radial velocity a double Velocity (km/s)
Stellar Parametersb
teff_val Stellar effective temperature float Temperature (K)
lum_val Stellar luminosity float Luminosity (Solar Luminosity)
Other fields not in the Gaia DR2 data model
Indices
parentid array index of the generating star particle in the snapshot file long
partid 0 if phase-space coordinates are identical to the generating star particle, 1 otherwise short
Phase space
ra_true true ra double Angle (deg)
dec_true true dec double Angle (deg)
rad_true true LSR-centric distance double Distance (kpc)
dmod_true true distance modulus double Magnitude (mag)
parallax_true true parallax double Angle (mas)
pmra_true true pm in ra direction double Angular Velocity (mas/yr)
pmdec_true true pm in dec direction double Angular Velocity (mas/yr)
radial_velocity_true true RV double Velocity (km/s)
l_true true Galactic long double Angle (deg)
b_true true Galactic lat double Angle (deg)
px_true, py_true, pz_true true position relative to LSRc double Distance(kpc)
vx_true, vy_true, vz_true true velocity relative to LSRc double Velocity (km/s)
Photometry
phot_g_mean_mag_true true (i.e. after extinction, but before error convolution) apparent G-band mean magnitude float Magnitude (mag)
phot_bp_mean_mag_true true apparent GBp-band mean magnitude float Magnitude (mag)
phot_rp_mean_mag_true true apparent GRp-band mean magnitude float Magnitude (mag)
bp_rp_true true GBp–GRp colour float Magnitude (mag)
bp_g_true true GBp– G colour float Magnitude (mag)
g_rp_true true G –GRp colour float Magnitude (mag)
phot_g_mean_mag_int intrinsic (i.e. before extinction or error convolution) apparent G-band magnitude float Magnitude (mag)
phot_bp_mean_mag_int intrinsic apparent GBp-band mean magnitude float Magnitude (mag)
phot_rp_mean_mag_int intrinsic apparent GRp-band mean magnitude float Magnitude (mag)
bp_rp_int intrinsic GBp–GRp color float Magnitude (mag)
bp_g_int intrinsic GBp– G color float Magnitude (mag)
g_rp_int intrinsic G-GRp color float Magnitude (mag)
2MASS Photometry
2MASS_magH 2MASS apparent H-band magnitude float Magnitude (mag)
2MASS_magH_error 2MASS apparent H-band magnitude error float Magnitude (mag)
2MASS_magH_int intrinsic (i.e. before extinction or error convolution) apparent H-band magnitude float Magnitude (mag)
2MASS_magH_true true(i.e. after extinction, but before error convolution) apparent H-band magnitude float Magnitude (mag)
2MASS_magJ 2MASS apparent J-band magnitude float Magnitude (mag)
2MASS_magJ_error 2MASS apparent J-band magnitude error float Magnitude (mag)
2MASS_magJ_int intrinsic apparent J-band magnitude float Magnitude (mag)
2MASS_magJ_true true apparent J-band magnitude float Magnitude (mag)
2MASS_magKs 2MASS apparent Ks-band magnitude float Magnitude (mag)
2MASS_magKs_error 2MASS apparent Ks-band magnitude error float Magnitude (mag)
2MASS_magKs_int intrinsic apparent Ks-band magnitude float Magnitude (mag)
2MASS_magKs_true true apparent Ks-band magnitude float Magnitude (mag)
Extinction
lognh log10 equivalent H column density along line of sight to star float cm-2
ebv E(B-V) reddening, calculated from equivalent NH float Magnitude (mag)
A0 A0, extinction at 550 nm, assuming RV=3.1 float Magnitude (mag)
Stellar Parameters
mact current stellar mass float Mass (Solar Mass)
mtip mass of a star at tip of giant branch for given age, metallicityd float Mass (Solar Mass)
mini stellar mass on zero-age main sequence float Mass (Solar Mass)
age log10 stellar age; identical for all stars generated from the same particle float Time (log yr)
logg surface gravity float Surface Gravity (log cgs)
Abundancese
feh [Fe/H] float Abundances (dex)
alpha [Mg/Fe] float Abundances (dex)
carbon [C/H] float Abundances (dex)
helium [He/H] float Abundances (dex)
nitrogen [N/H] float Abundances (dex)
sulphur [S/H] float Abundances (dex)
oxygen [O/H] float Abundances (dex)
silicon [Si/H] float Abundances (dex)
calcium [Ca/H] float Abundances (dex)
magnesium [Mg/H] float Abundances (dex)
neon [Ne/H] float Abundances (dex)
APOGEE Abundancese
FeH-APOGEE [Fe/H]-APOGEE float Abundances (dex)
MgFe-APOGEE [Mg/Fe]-APOGEE float Abundances (dex)
CFe-APOGEE [C/Fe]-APOGEE float Abundances (dex)
NFe-APOGEE [N/Fe]-APOGEE float Abundances (dex)
SFe-APOGEE [S/Fe]-APOGEE float Abundances (dex)
OFe-APOGEE [O/Fe]-APOGEE float Abundances (dex)
SiFe-APOGEE [Si/Fe]-APOGEE float Abundances (dex)
CaFe-APOGEE [Ca/Fe]-APOGEE float Abundances (dex)

a. constant noise floor of 0.11 km/s added in quadrature
b. not error-convolved
c. see Sanderson et al. 2018 for a discussion of the coordinate systems
d. evolved stars are those with mact > mtip
e. all relative to solar; identical for all stars generated from the same particle.