(335) Roberta
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	31 Aug 2025	14.5	2.711 AU	2.761 AU	05h22m	+18°08'	76.6°	21.2°
Opposition	11 Dec 2025	13.0	2.831 AU	1.851 AU	05h20m	+15°51'	172.7°	2.5°

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)                : 0.1718252
            a (Semimajor axis)              : 2.4753265
            i (Inclination)                 : 5.10246
            Ω (Longitude of ascending node) : 148.41358
            ω (Argument of perihelion)      : 139.79183
            M (Mean anomaly)                : 85.50954
            Epoch                           : 2025 May 05

            L (Longitude of perihelion)     : 108.31754
            B (Latitude of perihelion)      : 3.29144
            P (Orbital period in years)     : 3.89            
        

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. A more printer-friendly version of the same chart can be found below.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-08-31 00:00 UT   05 22 09.6   +18 08 05     2.761    2.711   76.6   21.2   265   14.5 
2025-08-31 15:30 UT   05 22 51.5   +18 07 49     2.753    2.711   77.0   21.3   265   14.5 
2025-09-01 00:00 UT   05 23 14.3   +18 07 40     2.749    2.712   77.3   21.3   265   14.5 
2025-09-02 00:00 UT   05 24 18.2   +18 07 12     2.737    2.713   78.0   21.3   265   14.5 
2025-09-03 00:00 UT   05 25 21.2   +18 06 40     2.725    2.715   78.7   21.4   266   14.5 
2025-09-04 00:00 UT   05 26 23.2   +18 06 05     2.714    2.716   79.4   21.4   266   14.5 
2025-09-05 00:00 UT   05 27 24.4   +18 05 28     2.702    2.718   80.2   21.4   266   14.5 
2025-09-06 00:00 UT   05 28 24.6   +18 04 47     2.690    2.719   80.9   21.5   266   14.5 
2025-09-07 00:00 UT   05 29 24.0   +18 04 03     2.678    2.720   81.6   21.5   266   14.5 
2025-09-08 00:00 UT   05 30 22.3   +18 03 16     2.666    2.722   82.4   21.5   266   14.5 
2025-09-09 00:00 UT   05 31 19.7   +18 02 27     2.654    2.723   83.1   21.5   267   14.5 
2025-09-10 00:00 UT   05 32 16.1   +18 01 35     2.642    2.725   83.8   21.6   267   14.4 
2025-09-11 00:00 UT   05 33 11.6   +18 00 40     2.630    2.726   84.6   21.6   267   14.4 
2025-09-12 00:00 UT   05 34 06.0   +17 59 42     2.618    2.727   85.3   21.6   267   14.4 
2025-09-13 00:00 UT   05 34 59.3   +17 58 42     2.606    2.729   86.1   21.6   267   14.4 
2025-09-14 00:00 UT   05 35 51.7   +17 57 39     2.594    2.730   86.9   21.6   267   14.4 
2025-09-15 00:00 UT   05 36 42.9   +17 56 33     2.581    2.731   87.6   21.6   267   14.4 
2025-09-16 00:00 UT   05 37 33.1   +17 55 25     2.569    2.733   88.4   21.6   268   14.4 
2025-09-17 00:00 UT   05 38 22.2   +17 54 15     2.557    2.734   89.2   21.6   268   14.4 
2025-09-18 00:00 UT   05 39 10.1   +17 53 02     2.545    2.736   90.0   21.6   268   14.4 
2025-09-19 00:00 UT   05 39 56.9   +17 51 47     2.533    2.737   90.8   21.5   268   14.4 
2025-09-20 00:00 UT   05 40 42.6   +17 50 30     2.520    2.738   91.5   21.5   268   14.4 
2025-09-21 00:00 UT   05 41 27.0   +17 49 11     2.508    2.740   92.3   21.5   268   14.3 
2025-09-22 00:00 UT   05 42 10.3   +17 47 50     2.496    2.741   93.1   21.5   269   14.3 
2025-09-23 00:00 UT   05 42 52.4   +17 46 26     2.484    2.742   94.0   21.4   269   14.3 
2025-09-24 00:00 UT   05 43 33.2   +17 45 01     2.471    2.743   94.8   21.4   269   14.3 
2025-09-25 00:00 UT   05 44 12.8   +17 43 34     2.459    2.745   95.6   21.3   269   14.3 
2025-09-26 00:00 UT   05 44 51.1   +17 42 05     2.447    2.746   96.4   21.3   269   14.3 
2025-09-27 00:00 UT   05 45 28.1   +17 40 35     2.435    2.747   97.2   21.2   269   14.3 
2025-09-28 00:00 UT   05 46 03.8   +17 39 03     2.423    2.749   98.1   21.2   269   14.3 
2025-09-29 00:00 UT   05 46 38.2   +17 37 29     2.410    2.750   98.9   21.1   270   14.3 
2025-09-30 00:00 UT   05 47 11.3   +17 35 54     2.398    2.751   99.8   21.0   270   14.2 

    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.