2015 HU171
ephemeris	date	magn	radius	delta	ra	dec	elong	phase
Today	27 Jul 2026	28.8	2.449 AU	2.535 AU	03h15m	+13°46'	73.5°	23.4°

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
2026-07-27 00:00 UT   03 15 32.7   +13 46 01     2.535    2.449   73.5   23.4   254   28.8 
2026-07-27 13:04 UT   03 16 02.8   +13 47 40     2.532    2.452   73.9   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 
2026-07-29 00:00 UT   03 17 21.8   +13 51 56     2.521    2.461   75.0   23.5   254   28.8 
2026-07-30 00:00 UT   03 18 14.8   +13 54 45     2.514    2.467   75.7   23.5   254   28.8 
2026-07-31 00:00 UT   03 19 06.7   +13 57 29     2.506    2.474   76.4   23.5   254   28.8 
2026-08-01 00:00 UT   03 19 57.6   +14 00 07     2.499    2.480   77.2   23.5   254   28.8 
2026-08-02 00:00 UT   03 20 47.3   +14 02 39     2.491    2.486   77.9   23.5   254   28.8 
2026-08-03 00:00 UT   03 21 36.0   +14 05 06     2.484    2.492   78.7   23.5   254   28.8 
2026-08-04 00:00 UT   03 22 23.5   +14 07 28     2.476    2.498   79.4   23.5   255   28.8 
2026-08-05 00:00 UT   03 23 09.8   +14 09 43     2.468    2.504   80.2   23.5   255   28.8 
2026-08-06 00:00 UT   03 23 55.1   +14 11 54     2.460    2.510   81.0   23.5   255   28.8 
2026-08-07 00:00 UT   03 24 39.1   +14 13 58     2.452    2.516   81.7   23.5   255   28.8 
2026-08-08 00:00 UT   03 25 21.9   +14 15 57     2.445    2.522   82.5   23.5   255   28.8 
2026-08-09 00:00 UT   03 26 03.6   +14 17 51     2.436    2.528   83.3   23.5   255   28.8 
2026-08-10 00:00 UT   03 26 44.0   +14 19 39     2.428    2.534   84.1   23.5   255   28.8 
2026-08-11 00:00 UT   03 27 23.1   +14 21 21     2.420    2.540   84.9   23.4   255   28.7 
2026-08-12 00:00 UT   03 28 01.0   +14 22 58     2.412    2.545   85.7   23.4   255   28.7 
2026-08-13 00:00 UT   03 28 37.7   +14 24 29     2.404    2.551   86.5   23.4   256   28.7 
2026-08-14 00:00 UT   03 29 13.0   +14 25 55     2.396    2.557   87.3   23.3   256   28.7 
2026-08-15 00:00 UT   03 29 47.0   +14 27 15     2.387    2.563   88.1   23.3   256   28.7 
2026-08-16 00:00 UT   03 30 19.7   +14 28 30     2.379    2.569   89.0   23.2   256   28.7 
2026-08-17 00:00 UT   03 30 51.0   +14 29 39     2.371    2.575   89.8   23.2   256   28.7 
2026-08-18 00:00 UT   03 31 21.0   +14 30 43     2.362    2.580   90.6   23.1   256   28.7 
2026-08-19 00:00 UT   03 31 49.6   +14 31 41     2.354    2.586   91.5   23.0   256   28.7 
2026-08-20 00:00 UT   03 32 16.8   +14 32 34     2.345    2.592   92.3   23.0   256   28.7 
2026-08-21 00:00 UT   03 32 42.6   +14 33 22     2.337    2.598   93.2   22.9   256   28.7 
2026-08-22 00:00 UT   03 33 07.0   +14 34 04     2.328    2.603   94.0   22.8   257   28.7 
2026-08-23 00:00 UT   03 33 29.9   +14 34 40     2.320    2.609   94.9   22.7   257   28.7 
2026-08-24 00:00 UT   03 33 51.4   +14 35 11     2.311    2.615   95.8   22.6   257   28.7 
2026-08-25 00:00 UT   03 34 11.5   +14 35 37     2.303    2.620   96.7   22.5   257   28.7 
2026-08-26 00:00 UT   03 34 30.0   +14 35 57     2.294    2.626   97.6   22.4   257   28.7 

    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.