“List of common astronomy symbols”的意思、由来-开放百科全书

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List of common astronomy symbols

释义

Age (stellar)
Astrometry parameters
Cosmological parameters
Distance description
Galaxy comparison
Luminosity comparison
Mass comparison
Metallicity comparison
Orbital parameters
Radius comparison
Spectral comparison
Temperature description
See also
References

This is a compilation of symbols commonly used in astronomy, particularly professional astronomy.

Age (stellar)

τ - age

Astrometry parameters

R_v - radial velocity
cz - apparent radial velocity
z - Redshift
μ - proper motion
π - parallax
J - epoch
α - Right Ascension
δ - Declination
λ - Ecliptic longitude
β - Ecliptic latitude
l - Galactic longitude
b - Galactic latitude

Cosmological parameters

h - dimensionless Hubble parameter
H₀ - Hubble constant
Λ - cosmological constant
Ω - density parameter
ρ - density
ρ_c - critical density
z - redshift

Distance description

Distance description for orbital and non-orbital parameters:

d - distance
- d - in km = kilometer
- d - in mi = mile
- d - in AU = astronomical unit
- d - in ly = light-year
- d - in pc = parsec
- d - in kpc = kiloparsec (1000 pc)
D_L - luminosity distance, obtaining an objects distance using only visual aspects

Galaxy comparison

Galaxy type and spectral comparison:

see galaxy morphological classification

Luminosity comparison

Luminosity comparison:

L_S, {{Solar luminosity}} - luminosity of the Sun (Sol)

Luminosity of certain object:

L_acc - accretion luminosity
L_bol - bolometric luminosity

Mass comparison

Mass comparison:

M_E, {{Earth mass}} - mass of Earth
{{Jupiter mass}}, {{Jupiter mass|greek=y}} - mass of Jupiter
M_S, {{Solar mass}} - mass of the Sun (Sol)

Mass of certain object:

M_●^[1] - mass of black hole
M_acc - mass of accretion disc

Metallicity comparison

Metallicity comparison:

[Fe/H] - Iron ratio to Hydrogen, a logarithm representation of the ratio of a star's iron abundance compared to that of the Sun
[M/H] - Metallicity ratio.
Z - Metallicity
Z_S, Z_☉ - Metallicity of the Sun (Sol)

Orbital parameters

Orbital Parameters of a Cosmic Object:

α - RA, right ascension, if the Greek letter does not appear, á letter will appear.
δ - Dec, declination, if the Greek letter does not appear, ä letter will appear.
P or P_orb - orbital period
a - semi-major axis
b - semi-minor axis
q - periapsis, the minimum distance
Q - apsis, the maximum distance
e - eccentricity
i - inclination
Ω - longitude of ascending node
ω - argument of periapsis
R_L - Roche lobe
M - Mean anomaly
M_o - Mean anomaly at epoch

Radius comparison

Radius comparison:

R_E, {{Earth radius}} - Radius compared to Earth
{{Jupiter radius}}, {{Jupiter radius|greek=y}} - Radius compared to Jupiter
R_S, {{Solar radius}} - Radius compared to The Sun (Sol)

Spectral comparison

Spectral comparison:

see Stellar classification
m_(object) - Apparent magnitude
M_(object) - Absolute magnitude, for galaxies and stars
H_(object) - Absolute magnitude, for planets and nonstellar objects

Temperature description

Temperature description:

T_eff - Temperature Effect, usually associated with luminous object
T_max - Temperature Maximum, usually associated with non-luminous object
T_avg - Temperature Average, usually associated with non-luminous object
T_min - Temperature Minimum, usually associated with non-luminous object
K - Kelvin

References

1. ^Ultra-luminous X-ray sources: X-ray binaries in a high/hard state?, Z. Kuncic, R. Soria, C. K. Hung, M. C. Freeland, G. V. Bicknell, 2006

2 : Astronomy-related lists|Lists of symbols

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