(335) Roberta
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	17 Sep 2025	14.4	2.734 AU	2.557 AU	05h38m	+17°54'	89.2°	21.6°
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
2025-09-17 00:00 UT   05 38 22.2   +17 54 15     2.557    2.734   89.2   21.6   268   14.4 
2025-09-17 06:25 UT   05 38 35.1   +17 53 56     2.554    2.735   89.4   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 
2025-10-01 00:00 UT   05 47 43.1   +17 34 18     2.386    2.753  100.6   20.9   270   14.2 
2025-10-02 00:00 UT   05 48 13.4   +17 32 40     2.374    2.754  101.5   20.9   270   14.2 
2025-10-03 00:00 UT   05 48 42.4   +17 31 01     2.362    2.755  102.3   20.8   270   14.2 
2025-10-04 00:00 UT   05 49 10.1   +17 29 21     2.350    2.756  103.2   20.7   270   14.2 
2025-10-05 00:00 UT   05 49 36.3   +17 27 39     2.338    2.758  104.1   20.6   270   14.2 
2025-10-06 00:00 UT   05 50 01.1   +17 25 57     2.326    2.759  105.0   20.5   271   14.2 
2025-10-07 00:00 UT   05 50 24.4   +17 24 14     2.314    2.760  105.8   20.4   271   14.1 
2025-10-08 00:00 UT   05 50 46.3   +17 22 30     2.303    2.761  106.7   20.3   271   14.1 
2025-10-09 00:00 UT   05 51 06.7   +17 20 45     2.291    2.763  107.6   20.2   271   14.1 
2025-10-10 00:00 UT   05 51 25.7   +17 18 59     2.279    2.764  108.5   20.0   271   14.1 
2025-10-11 00:00 UT   05 51 43.1   +17 17 12     2.267    2.765  109.4   19.9   271   14.1 
2025-10-12 00:00 UT   05 51 59.0   +17 15 25     2.256    2.766  110.4   19.8   271   14.1 
2025-10-13 00:00 UT   05 52 13.3   +17 13 37     2.244    2.768  111.3   19.6   272   14.1 
2025-10-14 00:00 UT   05 52 26.1   +17 11 49     2.233    2.769  112.2   19.5   272   14.0 
2025-10-15 00:00 UT   05 52 37.4   +17 10 00     2.222    2.770  113.2   19.3   272   14.0 
2025-10-16 00:00 UT   05 52 47.0   +17 08 11     2.210    2.771  114.1   19.2   272   14.0 
2025-10-17 00:00 UT   05 52 55.0   +17 06 22     2.199    2.772  115.1   19.0   272   14.0 

    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.