(154) Bertha
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	22 Jul 2026	13.2	2.973 AU	2.740 AU	13h49m	-18°07'	93.1°	20.0°
Opposition	23 Jul 2027	12.6	3.203 AU	2.284 AU	20h52m	-48°57'	149.9°	9.1°

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 Bertha are:

            e (Eccentricity)                : 0.0771710
            a (Semimajor axis)              : 3.1936962
            i (Inclination)                 : 21.02090
            Ω (Longitude of ascending node) : 36.47777
            ω (Argument of perihelion)      : 168.02073
            M (Mean anomaly)                : 17.11742
            Epoch                           : 2026 Jun 09

            L (Longitude of perihelion)     : 25.27487
            B (Latitude of perihelion)      : 4.26978
            P (Orbital period in years)     : 5.71            
        

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
2026-07-22 00:00 UT   13 49 51.6   -18 07 35     2.740    2.973   93.1   20.0   110   13.2 
2026-07-22 02:25 UT   13 49 55.3   -18 08 11     2.742    2.973   93.0   20.0   110   13.2 
2026-07-23 00:00 UT   13 50 29.0   -18 13 41     2.754    2.974   92.3   20.0   111   13.2 
2026-07-24 00:00 UT   13 51 07.5   -18 19 51     2.768    2.974   91.5   20.0   111   13.2 
2026-07-25 00:00 UT   13 51 46.9   -18 26 03     2.782    2.974   90.8   20.0   111   13.2 
2026-07-26 00:00 UT   13 52 27.3   -18 32 18     2.796    2.975   90.0   20.0   111   13.2 
2026-07-27 00:00 UT   13 53 08.7   -18 38 36     2.810    2.975   89.2   20.0   111   13.3 
2026-07-28 00:00 UT   13 53 51.1   -18 44 57     2.824    2.975   88.5   19.9   111   13.3 
2026-07-29 00:00 UT   13 54 34.4   -18 51 21     2.838    2.976   87.7   19.9   111   13.3 
2026-07-30 00:00 UT   13 55 18.6   -18 57 47     2.852    2.976   87.0   19.9   111   13.3 
2026-07-31 00:00 UT   13 56 03.8   -19 04 16     2.866    2.976   86.2   19.9   111   13.3 
2026-08-01 00:00 UT   13 56 49.9   -19 10 48     2.879    2.977   85.5   19.9   111   13.3 
2026-08-02 00:00 UT   13 57 36.9   -19 17 22     2.893    2.977   84.8   19.8   111   13.3 
2026-08-03 00:00 UT   13 58 24.8   -19 23 58     2.907    2.978   84.0   19.8   111   13.3 
2026-08-04 00:00 UT   13 59 13.5   -19 30 37     2.921    2.978   83.3   19.8   111   13.3 
2026-08-05 00:00 UT   14 00 03.2   -19 37 19     2.935    2.978   82.6   19.7   111   13.3 
2026-08-06 00:00 UT   14 00 53.7   -19 44 02     2.949    2.979   81.8   19.7   111   13.4 
2026-08-07 00:00 UT   14 01 45.1   -19 50 48     2.962    2.979   81.1   19.7   111   13.4 
2026-08-08 00:00 UT   14 02 37.3   -19 57 36     2.976    2.980   80.4   19.6   111   13.4 
2026-08-09 00:00 UT   14 03 30.4   -20 04 26     2.990    2.980   79.7   19.6   111   13.4 
2026-08-10 00:00 UT   14 04 24.3   -20 11 18     3.003    2.980   79.0   19.5   111   13.4 
2026-08-11 00:00 UT   14 05 19.0   -20 18 13     3.017    2.981   78.3   19.4   112   13.4 
2026-08-12 00:00 UT   14 06 14.6   -20 25 09     3.031    2.981   77.5   19.4   112   13.4 
2026-08-13 00:00 UT   14 07 10.9   -20 32 07     3.044    2.982   76.8   19.3   112   13.4 
2026-08-14 00:00 UT   14 08 08.1   -20 39 08     3.058    2.982   76.1   19.3   112   13.4 
2026-08-15 00:00 UT   14 09 06.0   -20 46 10     3.071    2.982   75.4   19.2   112   13.4 
2026-08-16 00:00 UT   14 10 04.8   -20 53 13     3.085    2.983   74.7   19.1   112   13.4 
2026-08-17 00:00 UT   14 11 04.3   -21 00 19     3.098    2.983   74.0   19.0   112   13.4 
2026-08-18 00:00 UT   14 12 04.5   -21 07 26     3.111    2.984   73.4   19.0   112   13.5 
2026-08-19 00:00 UT   14 13 05.5   -21 14 35     3.125    2.984   72.7   18.9   112   13.5 
2026-08-20 00:00 UT   14 14 07.2   -21 21 45     3.138    2.984   72.0   18.8   112   13.5 
2026-08-21 00:00 UT   14 15 09.7   -21 28 56     3.151    2.985   71.3   18.7   112   13.5 

    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.