FISICAL   DATA   ABOUT   THE   SUN



SUN

Classification              Sequenza principale
Spectral class              G2

ORBITAL PARAMETER   (epoch: J2000)

Major semiaxys              26-28000 anni luce
Orbital period              2,25-2,50  10^6 anni
Orbital speed               217 km/s (media)
Planetary sistem            s

FISICAL DATA

Diameter                    1 392 000 km
Surface                     6,09  10^18 m
Volume                      1,41  10^27 m
Mass                        1,9891  10^30 kg
Density                     1,411  10^3 kg/m
Accelerat. of gravity on surface         274 m/s   (27,9 g)
Escape speed                617,54 km/s
Rotational period
At equator                  27 d 6 h 36 min
At 30 of latitude:         28 d 4 h 48 min
At 60 of latitude:         30 d 19 h 12 min
At 75 of latitude:         31 d 19 h 12 min
Speed of di rotation  (all'equatore)     1993 m/s
Inclinat. of axis on ecliptic            7,25
Inclinat. of axis on galactical plane   67,23
A.R. north pole            286,13 (19 h 4 min 30 s)
Declination                63,87 (63 52')
Temperature on surface     5780 K (media)
T. of corona               5  10^6 K
T. of nucleo               ~13,6  10^6 K
Brightness                 3,827  10^26 J/s
Radiance                   2,009  10^7 W/(srm)

OBSERVATIVE DATA

Apparent magnitude as see from the Earth     -26,8 (media)
Absolute mag.              4,8