Best times to observe asteroid Juno (3 Juno) between now (late 2008) and 2020

Asteroid 3 Juno at its next closest approach to the Earth, in September 2009.

I'm continuing to check here to see when a number of asteroids will be closest to Earth (and thus the best times to observe them), and today you can see the closest approaches to Earth by the asteroid 3 Juno until 2020. The next approach will be the second-closest approach, with only the approach on 2018 closer. To see what kind of observations we've obtained of Juno at these distances, see this page.



28 September 2009 ----- 1.198 AU
4 March 2011 ----- 1.778 AU
22 May 2012 ----- 2.376 AU
13 August 2013 ----- 1.691 AU
22 January 2015 ----- 1.326 AU
24 April 2016 ----- 2.297 AU
10 July 2017 ----- 2.096 AU
15 November 2018 ----- 1.04 AU

Here is some basic information on the asteroid from its Wikipedia page.

Orbital characteristics[1]
Epoch November 30, 2008 (JD 2454800.5)
Aphelion	502.050 Gm (3.356 AU)
Perihelion	297.40 Gm (1.988 AU)
Semi-major axis	399.725 Gm (2.672 AU)
Eccentricity	0.2559
Orbital period	1595.4 d (4.37 a)
Average orbital speed	17.93 km/s
Mean anomaly	256.8°
Inclination	12.968°
Longitude of ascending node	169.96°
Argument of perihelion	247.93°
Physical characteristics
Dimensions	320×267×200 km[2] (233 km)[1]
Mass	2.67 ×1019 kg[2]
Mean density	2.98 ± 0.55 g/cm³[2]
Equatorial surface gravity	0.12 m/s²
Escape velocity	0.18 km/s
Rotation period	7.21 hr[1] (0.3004 d)[3]
Albedo	0.238 (geometric)[1][4]
Temperature	~163 K max: 301 K (+28° C)[5]
Spectral type	S-type asteroid[1][6]
Apparent magnitude	7.5[7][8] to 11.55
Absolute magnitude (H)	5.33[1][4]
Angular diameter	0.30" to 0.07"