(335) Roberta
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	18 Jul 2025	14.6	2.643 AU	3.206 AU	04h23m	+17°22'	48.4°	16.7°
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
2025-07-18 00:00 UT   04 23 33.8   +17 22 13     3.206    2.643   48.4   16.7   257   14.6 
2025-07-18 22:56 UT   04 25 00.7   +17 24 43     3.198    2.645   49.0   16.9   257   14.6 
2025-07-19 00:00 UT   04 25 04.8   +17 24 50     3.198    2.645   49.0   16.9   257   14.6 
2025-07-20 00:00 UT   04 26 35.4   +17 27 22     3.189    2.647   49.6   17.0   257   14.6 
2025-07-21 00:00 UT   04 28 05.6   +17 29 49     3.181    2.648   50.2   17.1   258   14.6 
2025-07-22 00:00 UT   04 29 35.4   +17 32 12     3.172    2.650   50.8   17.3   258   14.6 
2025-07-23 00:00 UT   04 31 04.8   +17 34 30     3.164    2.651   51.4   17.4   258   14.6 
2025-07-24 00:00 UT   04 32 33.8   +17 36 43     3.155    2.653   52.0   17.6   258   14.6 
2025-07-25 00:00 UT   04 34 02.3   +17 38 52     3.146    2.655   52.6   17.7   258   14.6 
2025-07-26 00:00 UT   04 35 30.4   +17 40 56     3.137    2.656   53.2   17.8   259   14.6 
2025-07-27 00:00 UT   04 36 58.1   +17 42 55     3.128    2.658   53.8   18.0   259   14.6 
2025-07-28 00:00 UT   04 38 25.3   +17 44 50     3.119    2.659   54.4   18.1   259   14.6 
2025-07-29 00:00 UT   04 39 52.0   +17 46 40     3.110    2.661   55.0   18.2   259   14.6 
2025-07-30 00:00 UT   04 41 18.3   +17 48 26     3.100    2.663   55.6   18.3   259   14.6 
2025-07-31 00:00 UT   04 42 44.1   +17 50 07     3.091    2.664   56.2   18.5   259   14.6 
2025-08-01 00:00 UT   04 44 09.4   +17 51 44     3.082    2.666   56.8   18.6   260   14.6 
2025-08-02 00:00 UT   04 45 34.2   +17 53 16     3.072    2.667   57.5   18.7   260   14.6 
2025-08-03 00:00 UT   04 46 58.4   +17 54 44     3.062    2.669   58.1   18.8   260   14.6 
2025-08-04 00:00 UT   04 48 22.2   +17 56 08     3.053    2.670   58.7   18.9   260   14.6 
2025-08-05 00:00 UT   04 49 45.4   +17 57 27     3.043    2.672   59.3   19.1   260   14.6 
2025-08-06 00:00 UT   04 51 08.1   +17 58 42     3.033    2.673   60.0   19.2   261   14.6 
2025-08-07 00:00 UT   04 52 30.3   +17 59 52     3.023    2.675   60.6   19.3   261   14.6 
2025-08-08 00:00 UT   04 53 51.9   +18 00 59     3.013    2.676   61.2   19.4   261   14.6 
2025-08-09 00:00 UT   04 55 12.9   +18 02 01     3.003    2.678   61.9   19.5   261   14.6 
2025-08-10 00:00 UT   04 56 33.4   +18 02 59     2.992    2.680   62.5   19.6   261   14.6 
2025-08-11 00:00 UT   04 57 53.3   +18 03 53     2.982    2.681   63.1   19.7   262   14.6 

    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.