| 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
$$
M_a = (14.441 + 5.999\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.441 |
| n |
5.999 |
| gf |
0.997 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.991 |
| 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) |
| 2026-03-26 00:00 |
18:27:27.91 |
-21:56:56.5 |
HIP 90631 |
32.31 |
| 2026-03-26 12:00 |
18:27:48.65 |
-21:56:42.1 |
HIP 90631 |
28.15 |
| 2026-03-27 00:00 |
18:28:09.10 |
-21:56:27.7 |
HIP 90631 |
24.28 |
| 2026-03-27 12:00 |
18:28:29.27 |
-21:56:13.4 |
HIP 90631 |
20.83 |
| 2026-03-28 00:00 |
18:28:49.15 |
-21:55:59.1 |
HIP 90631 |
17.99 |
| 2026-03-28 12:00 |
18:29:08.74 |
-21:55:44.8 |
HIP 90631 |
16.01 |
| 2026-03-29 00:00 |
18:29:28.05 |
-21:55:30.6 |
HIP 90631 |
15.18 |
| 2026-03-29 12:00 |
18:29:47.06 |
-21:55:16.5 |
HIP 90631 |
15.63 |
| 2026-03-30 00:00 |
18:30:05.79 |
-21:55:02.4 |
HIP 90631 |
17.21 |
| 2026-03-30 12:00 |
18:30:24.22 |
-21:54:48.5 |
HIP 90631 |
19.60 |
| 2026-03-31 00:00 |
18:30:42.35 |
-21:54:34.6 |
HIP 90631 |
22.51 |
| 2026-03-31 12:00 |
18:31:00.20 |
-21:54:20.8 |
HIP 90872 |
19.23 |
| 2026-04-01 00:00 |
18:31:17.74 |
-21:54:07.1 |
HIP 90872 |
15.89 |
| 2026-04-01 12:00 |
18:31:34.99 |
-21:53:53.6 |
HIP 90872 |
13.01 |
| 2026-04-02 00:00 |
18:31:51.94 |
-21:53:40.1 |
HIP 90872 |
10.90 |
| 2026-04-02 12:00 |
18:32:08.59 |
-21:53:26.8 |
HIP 90872 |
9.98 |
| 2026-04-03 00:00 |
18:32:24.94 |
-21:53:13.7 |
HIP 90872 |
10.48 |
| 2026-04-03 12:00 |
18:32:40.98 |
-21:53:00.7 |
HIP 90872 |
12.16 |
| 2026-04-04 00:00 |
18:32:56.73 |
-21:52:47.8 |
HIP 90872 |
14.57 |
| 2026-04-04 12:00 |
18:33:12.16 |
-21:52:35.1 |
HIP 90872 |
17.36 |
| 2026-04-05 00:00 |
18:33:27.29 |
-21:52:22.5 |
HIP 90872 |
20.34 |
| 2026-04-05 12:00 |
18:33:42.11 |
-21:52:10.2 |
HIP 91046 |
20.96 |
| 2026-04-06 00:00 |
18:33:56.62 |
-21:51:58.0 |
HIP 91046 |
19.56 |
| 2026-04-06 12:00 |
18:34:10.82 |
-21:51:46.0 |
HIP 91046 |
18.69 |
| 2026-04-07 00:00 |
18:34:24.70 |
-21:51:34.2 |
HIP 91046 |
18.37 |
| 2026-04-07 12:00 |
18:34:38.27 |
-21:51:22.6 |
HIP 91130 |
17.14 |
| 2026-04-08 00:00 |
18:34:51.53 |
-21:51:11.2 |
HIP 91130 |
15.77 |
| 2026-04-08 12:00 |
18:35:04.46 |
-21:51:00.0 |
HIP 91130 |
14.92 |
| 2026-04-09 00:00 |
18:35:17.08 |
-21:50:49.1 |
HIP 91130 |
14.66 |
| 2026-04-09 12:00 |
18:35:29.38 |
-21:50:38.4 |
HIP 91130 |
14.96 |
| 2026-04-10 00:00 |
18:35:41.36 |
-21:50:27.9 |
HIP 91130 |
15.75 |
| 2026-04-10 12:00 |
18:35:53.02 |
-21:50:17.7 |
HIP 91130 |
16.94 |
| 2026-04-11 00:00 |
18:36:04.35 |
-21:50:07.7 |
HIP 91130 |
18.40 |
| 2026-04-11 12:00 |
18:36:15.36 |
-21:49:58.0 |
HIP 91130 |
20.05 |
| 2026-04-12 00:00 |
18:36:26.04 |
-21:49:48.6 |
HIP 91130 |
21.82 |
| 2026-04-12 12:00 |
18:36:36.39 |
-21:49:39.4 |
HIP 91304 |
23.20 |
| 2026-04-13 00:00 |
18:36:46.41 |
-21:49:30.5 |
HIP 91304 |
21.96 |
| 2026-04-13 12:00 |
18:36:56.10 |
-21:49:21.9 |
HIP 91304 |
20.93 |
| 2026-04-14 00:00 |
18:37:05.46 |
-21:49:13.5 |
HIP 91304 |
20.14 |
| 2026-04-14 12:00 |
18:37:14.49 |
-21:49:05.5 |
HIP 91304 |
19.57 |
| 2026-04-15 00:00 |
18:37:23.18 |
-21:48:57.8 |
HIP 91304 |
19.23 |
| 2026-04-15 12:00 |
18:37:31.54 |
-21:48:50.4 |
HIP 91304 |
19.10 |
| 2026-04-16 00:00 |
18:37:39.56 |
-21:48:43.3 |
HIP 91304 |
19.16 |