698 Ernestina

698 Ernestina
	Modelled shape of Ernestina from its lightcurve
Discovery
Discovered by	J. Helffrich
Discovery site	Heidelberg Obs.
Discovery date	5 March 1910
Designations
MPC designation	(698) Ernestina
Named after	Ernst Wolf; (son of Max Wolf)
Alternative designations	A910 ED · A908 WB; 1910 JX
Minor planet category	main-belt · (outer); background
Orbital characteristics
	Epoch 31 May 2020 (JD 2459000.5)
	Uncertainty parameter 0
Observation arc	111.16 yr (40,601 d)
Aphelion	3.1847 AU
Perihelion	2.5490 AU
Semi-major axis	2.8669 AU
Eccentricity	0.1109
Orbital period (sidereal)	4.85 yr (1,773 d)
Mean anomaly	269.92°
Mean motion	0° 12m 10.8s / day
Inclination	11.532°
Longitude of ascending node	40.630°
Argument of perihelion	98.687°
Physical characteristics
Mean diameter	26.74±0.63 km; 27.03±1.2 km; 29.804±0.438 km;
Synodic rotation period	5.0363±0.0005 h
Pole ecliptic latitude	(213.0°, −66.0°) (λ1/β1); (76.0°, −49.0°) (λ2/β2);
Geometric albedo	0.095±0.016; 0.1269±0.012; 0.130±0.007;
Spectral type	C (assumed); Cgx, undef. (MOVIS);
Absolute magnitude (H)	10.70; 10.80; 10.9;

698 Ernestina (prov. designation: A910 ED or 1910 JX) is a background asteroid, approximately 27 kilometers (17 miles) in diameter, located in the outer regions of the asteroid belt. It was discovered on 5 March 1910, by German astronomer Joseph Helffrich at the Heidelberg-Königstuhl State Observatory. The presumed carbonaceous C-type asteroid has a rotation period of 5.0 hours. It was named after Ernst Wolf, son of German astronomer and prolific discoverer of minor planets, Max Wolf.

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