74503 Madola

Madola

Discovery
Discovered by	Denis Bergeron
Discovery site	Val-des-Bois (Quebec)
Discovery date	23 February 1999
Designations
MPC designation	74503
Alternative designations	1999 DN4
Orbital characteristics
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc	7693 days (21.06 yr)
Aphelion	3.5689053 AU (533.90063 Gm)
Perihelion	2.4583088 AU (367.75776 Gm)
Semi-major axis	3.0136070 AU (450.82919 Gm)
Eccentricity	0.1842637
Orbital period (sidereal)	5.23 yr (1910.9 d)
Mean anomaly	50.835764°
Mean motion	0.18839707°/day
Inclination	17.178978°
Longitude of ascending node	357.00607°
Argument of perihelion	200.78997°
Earth MOID	1.46517 AU (219.186 Gm)
Jupiter MOID	1.43584 AU (214.799 Gm)
Physical characteristics
Absolute magnitude (H)	15.3

74503 Madola (1999 DN4) is a main-belt asteroid discovered on February 23, 1999, by Denis Bergeron at Val-des-Bois(Quebec).

In mid-2009, it was officially named Madola by the International Astronomical Union, in honor of Christian Marois (b. 1974), René Doyon (b. 1963) and David Lafrenière (b. 1978), who developed instruments and techniques that allowed the first direct photograph of an extrasolar planetary system, consisting of three planets orbiting the star HR 8799 in Pegasus.

Doyon was director of the Mont-Mégantic Observatory in Quebec; Marois and Lafrenière were postdoctoral fellows at the Herzberg Institute of Astrophysics and the University of Toronto.

External links

• http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=madola;orb=0;cov=0;log=0;cad=0
• http://www.astrosurf.com/d_bergeron/astronomie/Bibliotheque/Decouvertes_asteroides/decouvertes_asteroides.htm (in French)
• 74503 Madola at the JPL Small-Body Database