{"id":922,"date":"2017-08-08T13:14:07","date_gmt":"2017-08-08T17:14:07","guid":{"rendered":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/back-matter\/a-5-some-useful-constants-for-astronomy\/"},"modified":"2017-08-08T13:14:07","modified_gmt":"2017-08-08T17:14:07","slug":"a-5-some-useful-constants-for-astronomy","status":"publish","type":"back-matter","link":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/back-matter\/a-5-some-useful-constants-for-astronomy\/","title":{"raw":"A.5 Some Useful Constants for Astronomy","rendered":"A.5 Some Useful Constants for Astronomy"},"content":{"raw":"
Physical Constants<\/th>\n<\/tr>
Name<\/th>\nValue<\/th>\n<\/tr><\/thead>
speed of light (c<\/em>)<\/td>\n2.9979 \u00d7 108<\/sup> m\/s<\/td>\n<\/tr>
gravitational constant (G<\/em>)<\/td>\n6.674 \u00d7 10\u221211<\/sup> m3<\/sup>\/(kg s2<\/sup>)<\/td>\n<\/tr>
Planck\u2019s constant (h<\/em>)<\/td>\n6.626 \u00d7 10\u221234<\/sup> J-s<\/td>\n<\/tr>
mass of a hydrogen atom (M<\/em>H<\/sub>)<\/td>\n1.673 \u00d7 10\u221227<\/sup> kg<\/td>\n<\/tr>
mass of an electron (M<\/em>e<\/sub>)<\/td>\n9.109 \u00d7 10\u221231<\/sup> kg<\/td>\n<\/tr>
Rydberg constant (R\u221eR\u221e)<\/td>\n1.0974 \u00d7 107<\/sup> m\u22121<\/sup><\/td>\n<\/tr>
Stefan-Boltzmann constant (\u03c3)<\/td>\n5.670 \u00d7 10\u22128<\/sup> J\/(s\u00b7m2<\/sup> deg4<\/sup>)1<\/sup><\/a><\/td>\n<\/tr>
Wien\u2019s law constant (\u03bbmax<\/sub>T)<\/td>\n2.898 \u00d7 10\u22123<\/sup> m K<\/td>\n<\/tr>
electron volt (energy) (eV)<\/td>\n1.602 \u00d7 10\u221219<\/sup> J<\/td>\n<\/tr>
energy equivalent of 1 ton TNT<\/td>\n4.2 \u00d7 109<\/sup> J<\/td>\n<\/tr><\/tbody><\/table>
Astronomical Constants<\/th>\n<\/tr>
Name<\/th>\nValue<\/th>\n<\/tr><\/thead>
astronomical unit (AU)<\/td>\n1.496 \u00d7 1011<\/sup> m<\/td>\n<\/tr>
Light-year (ly)<\/td>\n9.461 \u00d7 1015<\/sup> m<\/td>\n<\/tr>
parsec (pc)<\/td>\n3.086 \u00d7 1016<\/sup> m = 3.262 light-years<\/td>\n<\/tr>
sidereal year (y)<\/td>\n3.156 \u00d7 107<\/sup> s<\/td>\n<\/tr>
mass of Earth (M<\/em>Earth<\/sub>)<\/td>\n5.974 \u00d7 1024<\/sup> kg<\/td>\n<\/tr>
equatorial radius of Earth (R<\/em>Earth<\/sub>)<\/td>\n6.378 \u00d7 106<\/sup> m<\/td>\n<\/tr>
obliquity of ecliptic<\/td>\n23.4\u00b0 26\u2019<\/td>\n<\/tr>
surface gravity of Earth (g<\/em>)<\/td>\n9.807 m\/s2<\/sup><\/td>\n<\/tr>
escape velocity of Earth (v<\/em>Earth<\/sub>)<\/td>\n1.119 \u00d7 104<\/sup> m\/s<\/td>\n<\/tr>
mass of Sun (M<\/em>Sun<\/sub>)<\/td>\n1.989 \u00d7 1030<\/sup> kg<\/td>\n<\/tr>
equatorial radius of Sun (R<\/em>Sun<\/sub>)<\/td>\n6.960 \u00d7 108<\/sup> m<\/td>\n<\/tr>
luminosity of Sun (L<\/em>Sun<\/sub>)<\/td>\n3.85 \u00d7 1026<\/sup> W<\/td>\n<\/tr>
solar constant (flux of energy received at Earth) (S)<\/td>\n1.368 \u00d7 103<\/sup> W\/m2<\/sup><\/td>\n<\/tr>
Hubble constant (H0<\/sub>)<\/td>\napproximately 20 km\/s per million light-years, or approximately 70 km\/s per megaparsec<\/td>\n<\/tr><\/tbody><\/table>
\n

Footnotes<\/h2>\n
  1. 1<\/a> deg stands for degrees Celsius or kelvins<\/li>\n<\/ol><\/div>","rendered":"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Physical Constants<\/th>\n<\/tr>\n
    Name<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
    speed of light (c<\/em>)<\/td>\n2.9979 \u00d7 108<\/sup> m\/s<\/td>\n<\/tr>\n
    gravitational constant (G<\/em>)<\/td>\n6.674 \u00d7 10\u221211<\/sup> m3<\/sup>\/(kg s2<\/sup>)<\/td>\n<\/tr>\n
    Planck\u2019s constant (h<\/em>)<\/td>\n6.626 \u00d7 10\u221234<\/sup> J-s<\/td>\n<\/tr>\n
    mass of a hydrogen atom (M<\/em>H<\/sub>)<\/td>\n1.673 \u00d7 10\u221227<\/sup> kg<\/td>\n<\/tr>\n
    mass of an electron (M<\/em>e<\/sub>)<\/td>\n9.109 \u00d7 10\u221231<\/sup> kg<\/td>\n<\/tr>\n
    Rydberg constant (R\u221eR\u221e)<\/td>\n1.0974 \u00d7 107<\/sup> m\u22121<\/sup><\/td>\n<\/tr>\n
    Stefan-Boltzmann constant (\u03c3)<\/td>\n5.670 \u00d7 10\u22128<\/sup> J\/(s\u00b7m2<\/sup> deg4<\/sup>)1<\/sup><\/a><\/td>\n<\/tr>\n
    Wien\u2019s law constant (\u03bbmax<\/sub>T)<\/td>\n2.898 \u00d7 10\u22123<\/sup> m K<\/td>\n<\/tr>\n
    electron volt (energy) (eV)<\/td>\n1.602 \u00d7 10\u221219<\/sup> J<\/td>\n<\/tr>\n
    energy equivalent of 1 ton TNT<\/td>\n4.2 \u00d7 109<\/sup> J<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Astronomical Constants<\/th>\n<\/tr>\n
    Name<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
    astronomical unit (AU)<\/td>\n1.496 \u00d7 1011<\/sup> m<\/td>\n<\/tr>\n
    Light-year (ly)<\/td>\n9.461 \u00d7 1015<\/sup> m<\/td>\n<\/tr>\n
    parsec (pc)<\/td>\n3.086 \u00d7 1016<\/sup> m = 3.262 light-years<\/td>\n<\/tr>\n
    sidereal year (y)<\/td>\n3.156 \u00d7 107<\/sup> s<\/td>\n<\/tr>\n
    mass of Earth (M<\/em>Earth<\/sub>)<\/td>\n5.974 \u00d7 1024<\/sup> kg<\/td>\n<\/tr>\n
    equatorial radius of Earth (R<\/em>Earth<\/sub>)<\/td>\n6.378 \u00d7 106<\/sup> m<\/td>\n<\/tr>\n
    obliquity of ecliptic<\/td>\n23.4\u00b0 26\u2019<\/td>\n<\/tr>\n
    surface gravity of Earth (g<\/em>)<\/td>\n9.807 m\/s2<\/sup><\/td>\n<\/tr>\n
    escape velocity of Earth (v<\/em>Earth<\/sub>)<\/td>\n1.119 \u00d7 104<\/sup> m\/s<\/td>\n<\/tr>\n
    mass of Sun (M<\/em>Sun<\/sub>)<\/td>\n1.989 \u00d7 1030<\/sup> kg<\/td>\n<\/tr>\n
    equatorial radius of Sun (R<\/em>Sun<\/sub>)<\/td>\n6.960 \u00d7 108<\/sup> m<\/td>\n<\/tr>\n
    luminosity of Sun (L<\/em>Sun<\/sub>)<\/td>\n3.85 \u00d7 1026<\/sup> W<\/td>\n<\/tr>\n
    solar constant (flux of energy received at Earth) (S)<\/td>\n1.368 \u00d7 103<\/sup> W\/m2<\/sup><\/td>\n<\/tr>\n
    Hubble constant (H0<\/sub>)<\/td>\napproximately 20 km\/s per million light-years, or approximately 70 km\/s per megaparsec<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \n

    Footnotes<\/h2>\n
      \n
    1. 1<\/a> deg stands for degrees Celsius or kelvins<\/li>\n<\/ol>\n<\/div>\n","protected":false},"author":9,"menu_order":5,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"back-matter-type":[],"contributor":[],"license":[],"class_list":["post-922","back-matter","type-back-matter","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/wp-json\/pressbooks\/v2\/back-matter\/922","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/wp-json\/pressbooks\/v2\/back-matter"}],"about":[{"href":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/wp-json\/wp\/v2\/types\/back-matter"}],"author":[{"embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/wp-json\/wp\/v2\/users\/9"}],"version-history":[{"count":0,"href":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/wp-json\/pressbooks\/v2\/back-matter\/922\/revisions"}],"metadata":[{"href":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/wp-json\/pressbooks\/v2\/back-matter\/922\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/wp-json\/wp\/v2\/media?parent=922"}],"wp:term":[{"taxonomy":"back-matter-type","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/wp-json\/pressbooks\/v2\/back-matter-type?post=922"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/wp-json\/wp\/v2\/contributor?post=922"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/pressbooks.bccampus.ca\/astronomy1105\/wp-json\/wp\/v2\/license?post=922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}