| Parameter |
Value |
| Designation |
500P/PANSTARRS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-02-23T01:30:16.018560Z |
| Orbit solution date (soln_date, UTC) |
2026-03-11T21:13:03Z |
| Obs used |
87 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
16.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-11T15:21:07.488000Z |
| Discovery magnitude (MPC) |
21.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-06-16.0000000 |
| e |
0.41335657 |
| q (au) |
1.968866 |
| a (au) |
3.356155 |
| i (deg) |
2.381049 |
| Ω (om, deg) |
116.500219 |
| ω (w, deg) |
42.292781 |
| M (ma, deg) |
202.412297 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.441 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.441 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
17:43:39.45 |
-22:36:38.0 |
HIP 86778 |
9.90 |
| 2026-07-29 12:00 |
17:43:27.77 |
-22:36:50.5 |
HIP 86778 |
11.07 |
| 2026-07-30 00:00 |
17:43:16.38 |
-22:37:03.2 |
HIP 86778 |
12.68 |
| 2026-07-30 12:00 |
17:43:05.29 |
-22:37:15.8 |
HIP 86778 |
14.52 |
| 2026-07-31 00:00 |
17:42:54.51 |
-22:37:28.6 |
HIP 86684 |
15.64 |
| 2026-07-31 12:00 |
17:42:44.02 |
-22:37:41.3 |
HIP 86684 |
15.54 |
| 2026-08-01 00:00 |
17:42:33.82 |
-22:37:54.1 |
HIP 86684 |
15.80 |
| 2026-08-01 12:00 |
17:42:23.93 |
-22:38:07.0 |
HIP 86684 |
16.40 |
| 2026-08-02 00:00 |
17:42:14.34 |
-22:38:19.9 |
HIP 86684 |
17.25 |
| 2026-08-02 12:00 |
17:42:05.05 |
-22:38:32.9 |
HIP 86684 |
18.31 |
| 2026-08-03 00:00 |
17:41:56.07 |
-22:38:46.0 |
HIP 86684 |
19.51 |
| 2026-08-03 12:00 |
17:41:47.38 |
-22:38:59.1 |
HIP 86618 |
20.32 |
| 2026-08-04 00:00 |
17:41:39.00 |
-22:39:12.3 |
HIP 86618 |
20.86 |
| 2026-08-04 12:00 |
17:41:30.93 |
-22:39:25.6 |
HIP 86618 |
21.54 |
| 2026-08-05 00:00 |
17:41:23.15 |
-22:39:38.9 |
HIP 86618 |
22.33 |
| 2026-08-05 12:00 |
17:41:15.69 |
-22:39:52.3 |
HIP 86517 |
22.47 |
| 2026-08-06 00:00 |
17:41:08.52 |
-22:40:05.8 |
HIP 86517 |
22.32 |
| 2026-08-06 12:00 |
17:41:01.66 |
-22:40:19.4 |
HIP 86517 |
22.30 |
| 2026-08-07 00:00 |
17:40:55.11 |
-22:40:33.1 |
HIP 86517 |
22.40 |
| 2026-08-07 12:00 |
17:40:48.87 |
-22:40:46.8 |
HIP 86517 |
22.60 |
| 2026-08-08 00:00 |
17:40:42.93 |
-22:41:00.7 |
HIP 86517 |
22.89 |
| 2026-08-08 12:00 |
17:40:37.29 |
-22:41:14.6 |
HIP 86517 |
23.25 |
| 2026-08-09 00:00 |
17:40:31.97 |
-22:41:28.6 |
HIP 86517 |
23.67 |
| 2026-08-09 12:00 |
17:40:26.95 |
-22:41:42.7 |
HIP 86455 |
23.12 |
| 2026-08-10 00:00 |
17:40:22.24 |
-22:41:56.9 |
HIP 86455 |
22.58 |
| 2026-08-10 12:00 |
17:40:17.83 |
-22:42:11.2 |
HIP 86455 |
22.09 |
| 2026-08-11 00:00 |
17:40:13.74 |
-22:42:25.5 |
HIP 86455 |
21.66 |
| 2026-08-11 12:00 |
17:40:09.95 |
-22:42:40.0 |
HIP 86455 |
21.27 |
| 2026-08-12 00:00 |
17:40:06.47 |
-22:42:54.6 |
HIP 86455 |
20.92 |
| 2026-08-12 12:00 |
17:40:03.29 |
-22:43:09.2 |
HIP 86455 |
20.60 |
| 2026-08-13 00:00 |
17:40:00.43 |
-22:43:24.0 |
HIP 86455 |
20.31 |
| 2026-08-13 12:00 |
17:39:57.87 |
-22:43:38.8 |
HIP 86455 |
20.04 |
| 2026-08-14 00:00 |
17:39:55.61 |
-22:43:53.7 |
HIP 86455 |
19.78 |
| 2026-08-14 12:00 |
17:39:53.67 |
-22:44:08.8 |
HIP 86455 |
19.54 |
| 2026-08-15 00:00 |
17:39:52.03 |
-22:44:23.9 |
HIP 86455 |
19.30 |
| 2026-08-15 12:00 |
17:39:50.69 |
-22:44:39.1 |
HIP 86455 |
19.06 |
| 2026-08-16 00:00 |
17:39:49.66 |
-22:44:54.4 |
HIP 86455 |
18.82 |
| 2026-08-16 12:00 |
17:39:48.93 |
-22:45:09.8 |
HIP 86455 |
18.58 |
| 2026-08-17 00:00 |
17:39:48.50 |
-22:45:25.3 |
HIP 86455 |
18.33 |
| 2026-08-17 12:00 |
17:39:48.38 |
-22:45:40.8 |
HIP 86455 |
18.07 |
| 2026-08-18 00:00 |
17:39:48.56 |
-22:45:56.5 |
HIP 86455 |
17.81 |
| 2026-08-18 12:00 |
17:39:49.04 |
-22:46:12.2 |
HIP 86455 |
17.54 |
| 2026-08-19 00:00 |
17:39:49.81 |
-22:46:28.1 |
HIP 86455 |
17.26 |