Dejopeja (minor planet designation: 184 Dejopeja) is a large M-type Main belt asteroid. It was discovered by Johann Palisa on February 28, 1878, and was named after Deiopea, a Roman nymph.^[2]

184 Dejopeja

A three-dimensional model of 184 Dejopeja based on its light curve.
Discovery
Discovered by	J. Palisa, 1878
Discovery date	28 February 1878
Designations
MPC designation	(184) Dejopeja
Pronunciation	/diːoʊˈpiːə/
Named after	Deiopea
Alternative designations	A878 DA; 1903 QB; 1959 LL
Minor planet category	Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	123.52 yr (45117 d)
Aphelion	3.4005 AU (508.71 Gm)
Perihelion	2.9741 AU (444.92 Gm)
Semi-major axis	3.1873 AU (476.81 Gm)
Eccentricity	0.066883
Orbital period (sidereal)	5.69 yr (2078.4 d)
Mean anomaly	119.18°
Mean motion	0° 10m 23.556s / day
Inclination	1.1437°
Longitude of ascending node	331.61°
Argument of perihelion	209.72°
Earth MOID	1.97613 AU (295.625 Gm)
Jupiter MOID	1.56558 AU (234.207 Gm)
TJupiter	3.194
Physical characteristics
Mean radius	33.235±1 km
Synodic rotation period	6.455 h (0.2690 d)
Geometric albedo	0.1897±0.012
Spectral type	M
Absolute magnitude (H)	8.31

This is an X-type asteroid with a diameter of 66 km and a geometric albedo of 0.190. Based upon Photometric observations taken during 2000, it has a synodic rotation period of 6.441 ± 0.001 h. The light curve is tri-modal, most likely due to an angular shape, with a peak-to-peak amplitude of 0.19 ± 0.01 in magnitude.^[3]