2015 HU171
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	29 Jun 2026	28.7	2.269 AU	2.695 AU	02h43m	+11°43'	54.9°	21.5°

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 2015 HU171 are:

            e (Eccentricity)                : 0.5814578
            a (Semimajor axis)              : 2.3072862
            i (Inclination)                 : 5.61633
            Ω (Longitude of ascending node) : 76.84211
            ω (Argument of perihelion)      : 179.37033
            M (Mean anomaly)                : 353.19422
            Epoch                           : 2025 Nov 21

            L (Longitude of perihelion)     : 76.21546
            B (Latitude of perihelion)      : 0.06162
            P (Orbital period in years)     : 3.50            
        

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
2026-06-29 00:00 UT   02 43 34.7   +11 43 01     2.695    2.269   54.9   21.5   250   28.7 
2026-06-29 10:42 UT   02 44 10.3   +11 45 35     2.693    2.272   55.2   21.6   250   28.7 
2026-06-30 00:00 UT   02 44 54.3   +11 48 44     2.691    2.276   55.5   21.6   250   28.7 
2026-07-01 00:00 UT   02 46 13.2   +11 54 21     2.687    2.282   56.1   21.7   250   28.7 
2026-07-02 00:00 UT   02 47 31.3   +11 59 52     2.682    2.289   56.8   21.8   250   28.7 
2026-07-03 00:00 UT   02 48 48.7   +12 05 17     2.678    2.296   57.4   21.9   250   28.7 
2026-07-04 00:00 UT   02 50 05.4   +12 10 36     2.673    2.302   58.0   22.0   250   28.7 
2026-07-05 00:00 UT   02 51 21.2   +12 15 49     2.668    2.309   58.6   22.1   251   28.7 
2026-07-06 00:00 UT   02 52 36.3   +12 20 56     2.663    2.315   59.3   22.2   251   28.7 
2026-07-07 00:00 UT   02 53 50.5   +12 25 57     2.658    2.322   59.9   22.3   251   28.7 
2026-07-08 00:00 UT   02 55 04.0   +12 30 53     2.653    2.328   60.6   22.3   251   28.7 
2026-07-09 00:00 UT   02 56 16.7   +12 35 42     2.648    2.335   61.2   22.4   251   28.7 
2026-07-10 00:00 UT   02 57 28.5   +12 40 26     2.643    2.341   61.9   22.5   251   28.7 
2026-07-11 00:00 UT   02 58 39.5   +12 45 04     2.637    2.348   62.5   22.6   251   28.7 
2026-07-12 00:00 UT   02 59 49.7   +12 49 36     2.632    2.354   63.2   22.7   252   28.7 
2026-07-13 00:00 UT   03 00 59.0   +12 54 02     2.626    2.361   63.8   22.7   252   28.7 
2026-07-14 00:00 UT   03 02 07.4   +12 58 22     2.620    2.367   64.5   22.8   252   28.7 
2026-07-15 00:00 UT   03 03 15.0   +13 02 37     2.614    2.374   65.2   22.9   252   28.8 
2026-07-16 00:00 UT   03 04 21.6   +13 06 45     2.608    2.380   65.8   22.9   252   28.8 
2026-07-17 00:00 UT   03 05 27.4   +13 10 48     2.602    2.386   66.5   23.0   252   28.8 
2026-07-18 00:00 UT   03 06 32.2   +13 14 45     2.596    2.393   67.2   23.0   252   28.8 
2026-07-19 00:00 UT   03 07 36.1   +13 18 36     2.589    2.399   67.9   23.1   253   28.8 
2026-07-20 00:00 UT   03 08 39.1   +13 22 22     2.583    2.405   68.6   23.2   253   28.8 
2026-07-21 00:00 UT   03 09 41.1   +13 26 02     2.576    2.412   69.3   23.2   253   28.8 
2026-07-22 00:00 UT   03 10 42.2   +13 29 36     2.570    2.418   69.9   23.2   253   28.8 
2026-07-23 00:00 UT   03 11 42.3   +13 33 04     2.563    2.424   70.7   23.3   253   28.8 
2026-07-24 00:00 UT   03 12 41.4   +13 36 27     2.556    2.430   71.4   23.3   253   28.8 
2026-07-25 00:00 UT   03 13 39.5   +13 39 44     2.549    2.437   72.1   23.4   253   28.8 
2026-07-26 00:00 UT   03 14 36.6   +13 42 55     2.542    2.443   72.8   23.4   253   28.8 
2026-07-27 00:00 UT   03 15 32.7   +13 46 01     2.535    2.449   73.5   23.4   254   28.8 
2026-07-28 00:00 UT   03 16 27.8   +13 49 02     2.528    2.455   74.2   23.5   254   28.8 

    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.