(335) Roberta
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	11 Dec 2025	13.0	2.831 AU	1.852 AU	05h20m	+15°51'	172.7°	2.5°
Today	28 Dec 2025	13.3	2.845 AU	1.904 AU	05h04m	+15°51'	159.3°	7.0°

The interactive orbit chart above shows the body's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

The orbital elements of Roberta are:

            e (Eccentricity)                : 0.1715271
            a (Semimajor axis)              : 2.4764198
            i (Inclination)                 : 5.10249
            Ω (Longitude of ascending node) : 148.39541
            ω (Argument of perihelion)      : 139.93854
            M (Mean anomaly)                : 135.98574
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 108.44598
            B (Latitude of perihelion)      : 3.28146
            P (Orbital period in years)     : 3.90            
        

The light curve chart below shows the estimated development of the minor planet's magnitude.

The all-sky chart below shows the path of the minor planet over the same period as the light curve. The current position is marked yellow.

The following chart shows the path of the minor planet in the next few days. The field of view is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-28 00:00 UT   05 04 22.6   +15 51 38     1.904    2.845  159.3    7.0    66   13.3 
2025-12-28 00:13 UT   05 04 22.1   +15 51 38     1.904    2.845  159.2    7.0    66   13.3 
2025-12-29 00:00 UT   05 03 29.7   +15 52 10     1.910    2.846  158.1    7.4    67   13.3 
2025-12-30 00:00 UT   05 02 37.8   +15 52 45     1.916    2.847  156.9    7.8    68   13.3 
2025-12-31 00:00 UT   05 01 47.1   +15 53 25     1.922    2.848  155.8    8.1    69   13.4 
2026-01-01 00:00 UT   05 00 57.5   +15 54 07     1.928    2.848  154.6    8.5    70   13.4 
2026-01-02 00:00 UT   05 00 09.2   +15 54 54     1.935    2.849  153.5    8.9    70   13.4 
2026-01-03 00:00 UT   04 59 22.1   +15 55 44     1.942    2.850  152.3    9.2    71   13.4 
2026-01-04 00:00 UT   04 58 36.2   +15 56 38     1.950    2.851  151.2    9.6    72   13.4 
2026-01-05 00:00 UT   04 57 51.7   +15 57 36     1.957    2.851  150.0    9.9    72   13.5 
2026-01-06 00:00 UT   04 57 08.5   +15 58 37     1.965    2.852  148.9   10.3    73   13.5 
2026-01-07 00:00 UT   04 56 26.7   +15 59 42     1.973    2.853  147.7   10.6    73   13.5 
2026-01-08 00:00 UT   04 55 46.3   +16 00 51     1.981    2.854  146.6   10.9    74   13.5 
2026-01-09 00:00 UT   04 55 07.4   +16 02 03     1.990    2.854  145.4   11.3    74   13.6 
2026-01-10 00:00 UT   04 54 29.9   +16 03 19     1.998    2.855  144.3   11.6    74   13.6 
2026-01-11 00:00 UT   04 53 53.9   +16 04 39     2.007    2.856  143.1   11.9    75   13.6 
2026-01-12 00:00 UT   04 53 19.4   +16 06 02     2.017    2.857  142.0   12.2    75   13.6 
2026-01-13 00:00 UT   04 52 46.5   +16 07 29     2.026    2.857  140.9   12.5    75   13.6 
2026-01-14 00:00 UT   04 52 15.1   +16 08 59     2.036    2.858  139.8   12.8    76   13.7 
2026-01-15 00:00 UT   04 51 45.2   +16 10 34     2.045    2.859  138.7   13.1    76   13.7 
2026-01-16 00:00 UT   04 51 17.0   +16 12 11     2.055    2.859  137.6   13.4    76   13.7 
2026-01-17 00:00 UT   04 50 50.4   +16 13 53     2.066    2.860  136.5   13.7    77   13.7 
2026-01-18 00:00 UT   04 50 25.4   +16 15 37     2.076    2.861  135.4   14.0    77   13.8 
2026-01-19 00:00 UT   04 50 02.0   +16 17 25     2.087    2.862  134.3   14.3    77   13.8 
2026-01-20 00:00 UT   04 49 40.2   +16 19 17     2.097    2.862  133.2   14.5    77   13.8 
2026-01-21 00:00 UT   04 49 20.1   +16 21 12     2.108    2.863  132.1   14.8    78   13.8 
2026-01-22 00:00 UT   04 49 01.7   +16 23 10     2.120    2.864  131.0   15.0    78   13.8 
2026-01-23 00:00 UT   04 48 44.9   +16 25 11     2.131    2.864  130.0   15.3    78   13.9 
2026-01-24 00:00 UT   04 48 29.7   +16 27 16     2.142    2.865  128.9   15.5    78   13.9 
2026-01-25 00:00 UT   04 48 16.2   +16 29 24     2.154    2.866  127.8   15.7    78   13.9 
2026-01-26 00:00 UT   04 48 04.4   +16 31 34     2.166    2.866  126.8   16.0    79   13.9 
2026-01-27 00:00 UT   04 47 54.2   +16 33 48     2.178    2.867  125.8   16.2    79   13.9 

    Terminology:
            
    delta:  distance between minor planet and earth in AU
    radius: distance between minor planet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-minor planet)    
    phase:  phase angle in degrees (angle sun-minor planet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km
    

Orbital elements provided by the MPC (Minor Planet Center).
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.