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Дата индексирования: Fri Feb 28 08:27:27 2014
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Поисковые слова: helix nebula
Mean astrophysical parameters from LEDA

ASTROPHYSICAL PARAMETERS

This page gives the name and meaning of the various parameters which can be queried in HyperLeda through SQL requests. In addition to the tabulated parameters, a couple of functions can be used in queries, they are described at the bottom of this page.

parameter name type Description
pgc int pgc number
objname varchar principal designation
objtype character*1 nature of the object
al1950 real RA 1950 (hours decimal value)
de1950 real DEC 1950 (degrees decimal value)
al2000 real RA 2000 (hours decimal value)
de2000 real DEC 2000 (degrees decimal value)
l2 real galactic longitude (degrees)
b2 real galactic latitude (degrees)
sgl real supergalactic longitude (degrees)
sgb real supergalactic latitude (degrees)
f_astrom int precision flag on the celestial position
type char morphological type
bar char barred galaxy (B)
ring char galaxy with ring (R)
multiple char multiple galaxy (M)
compactness char Compact (C) or Diffuse (D)
t real morphological type code
e_t real actual error on t
lc real luminosity class code
e_lc real actual error on lc
logd25 real log10 of apparent major axis diameter d25 at 25 mag.arcsec-2(d25 in 0.1')
e_logd25 real actual error on logd25
logr25 real log10 of axis ratio (major axis/minor axis)
e_logr25 real actual error on logr25
pa real major axis position angle (North Eastwards) in degrees
brief real mean effective surface brightness (mag.arcsec-2)
e_brief real actual error on brief
bt real total B-magnitude
e_bt real actual error on bt
it real total I-magnitude
e_it real actual error on it
ubt real total U-B color
bvt real total B-V color
ube real effective U-B color
bve real effective B-V color
vmaxg real Apparent maximum rotation velocity of gas
e_vmaxg real actual error on vmaxg
vmaxs real Apparent maximum rotation velocity of stars
e_vmaxs real actual error on vmaxs
vdis real Central velocity dispersion (in km/s)
e_vdis real actual error on vdis
mg2 real Central Mg2 Lick index (in mag)
e_mg2 real actual error on mg2
m21 real 21-cm line flux in magnitude (see definition in text)
e_m21 real actual error on m21
mfir real far infrared magnitude (see definition in text)
vrad real heliocentric radial velocity from radio measurement (in km/s)
e_vrad real actual error on vrad
vopt real heliocentric radial velocity from optical measurement (in km/s)
e_vopt real actual error on vopt
v real mean heliocentric radial velocity (in km/s)
e_v real actual error on v
ag real galactic extinction in B magnitude from Schlegel et al.
ai real extinction due to inclination in B magnitude
incl real inclination between line of sight and polar axis (in degrees)
a21 real 21-cm self absorption in magnitude
lambda real luminosity index
logdc real log10 of apparent corrected diameter (dc in 0.1')
btc real total apparent corrected B-magnitude
(corrected for inclination, galactic extinction and K-correction)
itc real total apparent corrected I-magnitude
(corrected for same effects)
ubtc real total apparent corrected U-B color
(corrected for the same effects)
bvtc real total apparent corrected B-V color
(corrected for the same effects)
bri25 real mean surface brightness within isophote 25 (mag.arcsec-2)
vrot real maximum deprojected rotation velocity (km/s) of the gas
e_vrot real actual error on vrot
m21c real corrected 21-cm line flux in magnitude (see text)
hic real 21-cm index bt-m21c in magnitude
vlg real radial velocity with respect to the Local Group (km/s)
vgsr real radial velocity with respect to the GSR (km/s)
vvir real radial velocity corrected for LG infall onto Virgo (208 km/s)
v3k real radial velocity with respect to the CMB radiation (km/s)
modz real redshift distance modulus (from vvir and standard cosmological model)
mod0 real true distance modulus from some distance criteria (TF-relation, FJ-relation, Lambda_c relation, ...)
mabs real absolute B-magnitude

HyperLeda functions available in SQL requests

function usage type Description
hl_names(pgc) string Comma separated list of all the designations for the object "pgc"
celposB(pgc)
celposJ(pgc)
string Return the celestial position of object "pgc" in sexagesimal format

HyperLeda Questions: leda@univ-lyon1.fr