(516) Amherstia
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Opposition	18 Jul 2025	11.1	2.251 AU	1.248 AU	20h06m	-33°17'	167.2°	5.7°
Today	18 Sep 2025	12.6	2.431 AU	1.808 AU	19h37m	-26°17'	116.7°	21.7°

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 Amherstia are:

            e (Eccentricity)                : 0.2756250
            a (Semimajor axis)              : 2.6777276
            i (Inclination)                 : 12.95476
            Ω (Longitude of ascending node) : 328.71146
            ω (Argument of perihelion)      : 258.05399
            M (Mean anomaly)                : 69.99126
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 46.46276
            B (Latitude of perihelion)      : -12.66948
            P (Orbital period in years)     : 4.38            
        

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
2025-09-18 00:00 UT   19 37 16.7   -26 17 02     1.808    2.431  116.7   21.7    78   12.6 
2025-09-18 16:55 UT   19 37 36.1   -26 11 44     1.818    2.433  116.1   21.8    78   12.6 
2025-09-19 00:00 UT   19 37 44.5   -26 09 31     1.822    2.434  115.8   21.8    78   12.7 
2025-09-20 00:00 UT   19 38 13.8   -26 02 02     1.837    2.437  115.0   21.9    78   12.7 
2025-09-21 00:00 UT   19 38 44.6   -25 54 33     1.851    2.440  114.1   22.1    78   12.7 
2025-09-22 00:00 UT   19 39 16.8   -25 47 06     1.865    2.443  113.3   22.2    79   12.7 
2025-09-23 00:00 UT   19 39 50.5   -25 39 39     1.880    2.446  112.5   22.3    79   12.7 
2025-09-24 00:00 UT   19 40 25.7   -25 32 13     1.894    2.449  111.7   22.4    79   12.8 
2025-09-25 00:00 UT   19 41 02.2   -25 24 48     1.909    2.452  110.8   22.5    79   12.8 
2025-09-26 00:00 UT   19 41 40.1   -25 17 24     1.924    2.455  110.0   22.6    79   12.8 
2025-09-27 00:00 UT   19 42 19.3   -25 10 00     1.939    2.458  109.2   22.6    79   12.8 
2025-09-28 00:00 UT   19 42 59.8   -25 02 38     1.954    2.461  108.4   22.7    79   12.9 
2025-09-29 00:00 UT   19 43 41.6   -24 55 16     1.969    2.464  107.6   22.8    79   12.9 
2025-09-30 00:00 UT   19 44 24.7   -24 47 54     1.984    2.467  106.8   22.9    79   12.9 
2025-10-01 00:00 UT   19 45 09.0   -24 40 33     1.999    2.470  106.0   22.9    79   12.9 
2025-10-02 00:00 UT   19 45 54.5   -24 33 13     2.014    2.473  105.2   23.0    79   12.9 
2025-10-03 00:00 UT   19 46 41.2   -24 25 53     2.029    2.476  104.4   23.0    79   13.0 
2025-10-04 00:00 UT   19 47 29.0   -24 18 34     2.044    2.479  103.7   23.1    79   13.0 
2025-10-05 00:00 UT   19 48 17.9   -24 11 15     2.060    2.482  102.9   23.1    79   13.0 
2025-10-06 00:00 UT   19 49 07.9   -24 03 57     2.075    2.485  102.1   23.2    79   13.0 
2025-10-07 00:00 UT   19 49 59.0   -23 56 39     2.091    2.488  101.3   23.2    79   13.0 
2025-10-08 00:00 UT   19 50 51.1   -23 49 21     2.106    2.491  100.6   23.2    79   13.1 
2025-10-09 00:00 UT   19 51 44.3   -23 42 03     2.122    2.494   99.8   23.2    79   13.1 
2025-10-10 00:00 UT   19 52 38.5   -23 34 46     2.137    2.497   99.1   23.3    79   13.1 
2025-10-11 00:00 UT   19 53 33.6   -23 27 28     2.153    2.500   98.3   23.3    79   13.1 
2025-10-12 00:00 UT   19 54 29.7   -23 20 11     2.168    2.503   97.5   23.3    79   13.1 
2025-10-13 00:00 UT   19 55 26.7   -23 12 53     2.184    2.506   96.8   23.3    79   13.2 
2025-10-14 00:00 UT   19 56 24.7   -23 05 35     2.200    2.509   96.0   23.3    79   13.2 
2025-10-15 00:00 UT   19 57 23.5   -22 58 17     2.216    2.512   95.3   23.3    79   13.2 
2025-10-16 00:00 UT   19 58 23.3   -22 50 59     2.231    2.515   94.6   23.3    78   13.2 
2025-10-17 00:00 UT   19 59 23.9   -22 43 41     2.247    2.518   93.8   23.3    78   13.2 
2025-10-18 00:00 UT   20 00 25.4   -22 36 22     2.263    2.521   93.1   23.2    78   13.2 

    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.