| Parameter |
Value |
| Designation |
C/2018 P5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-02-26T05:12:25.888320Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:46Z |
| Obs used |
93 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2018-08-11T10:48:29.376000Z |
| Discovery magnitude (MPC) |
20.90 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-02-17.0000000 |
| e |
0.64088887 |
| q (au) |
4.575882 |
| a (au) |
12.742244 |
| i (deg) |
7.256838 |
| Ω (om, deg) |
216.241264 |
| ω (w, deg) |
131.634272 |
| M (ma, deg) |
359.800279 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.540 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.540 |
| n |
2.000 |
| gf |
0.901 |
| gb |
-0.890 |
| k |
1.000 |
| δ90 |
5.337 |
| 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) |
| 2026-09-20 00:00 |
08:25:32.58 |
+12:06:53.7 |
HIP 41247 |
11.56 |
| 2026-09-20 12:00 |
08:25:39.00 |
+12:06:18.4 |
HIP 41247 |
13.16 |
| 2026-09-21 00:00 |
08:25:45.36 |
+12:05:43.2 |
HIP 41247 |
14.76 |
| 2026-09-21 12:00 |
08:25:51.67 |
+12:05:08.1 |
HIP 41247 |
16.37 |
| 2026-09-22 00:00 |
08:25:57.93 |
+12:04:33.0 |
HIP 41247 |
17.97 |
| 2026-09-22 12:00 |
08:26:04.14 |
+12:03:58.1 |
HIP 41247 |
19.57 |
| 2026-09-23 00:00 |
08:26:10.29 |
+12:03:23.2 |
HIP 41473 |
20.47 |
| 2026-09-23 12:00 |
08:26:16.39 |
+12:02:48.5 |
HIP 41473 |
18.89 |
| 2026-09-24 00:00 |
08:26:22.43 |
+12:02:13.8 |
HIP 41473 |
17.33 |
| 2026-09-24 12:00 |
08:26:28.42 |
+12:01:39.2 |
HIP 41473 |
15.79 |
| 2026-09-25 00:00 |
08:26:34.36 |
+12:01:04.8 |
HIP 41473 |
14.26 |
| 2026-09-25 12:00 |
08:26:40.24 |
+12:00:30.4 |
HIP 41473 |
12.76 |
| 2026-09-26 00:00 |
08:26:46.06 |
+11:59:56.2 |
HIP 41473 |
11.28 |
| 2026-09-26 12:00 |
08:26:51.83 |
+11:59:22.1 |
HIP 41473 |
9.83 |
| 2026-09-27 00:00 |
08:26:57.55 |
+11:58:48.0 |
HIP 41473 |
8.43 |
| 2026-09-27 12:00 |
08:27:03.20 |
+11:58:14.1 |
HIP 41473 |
7.08 |
| 2026-09-28 00:00 |
08:27:08.80 |
+11:57:40.3 |
HIP 41473 |
5.81 |
| 2026-09-28 12:00 |
08:27:14.35 |
+11:57:06.7 |
HIP 41473 |
4.68 |
| 2026-09-29 00:00 |
08:27:19.83 |
+11:56:33.1 |
HIP 41473 |
3.81 |
| 2026-09-29 12:00 |
08:27:25.26 |
+11:55:59.6 |
HIP 41473 |
3.36 |
| 2026-09-30 00:00 |
08:27:30.64 |
+11:55:26.3 |
HIP 41473 |
3.50 |
| 2026-09-30 12:00 |
08:27:35.95 |
+11:54:53.1 |
HIP 41473 |
4.15 |
| 2026-10-01 00:00 |
08:27:41.20 |
+11:54:20.1 |
HIP 41473 |
5.11 |
| 2026-10-01 12:00 |
08:27:46.40 |
+11:53:47.1 |
HIP 41473 |
6.23 |
| 2026-10-02 00:00 |
08:27:51.54 |
+11:53:14.3 |
HIP 41473 |
7.43 |
| 2026-10-02 12:00 |
08:27:56.61 |
+11:52:41.6 |
HIP 41473 |
8.66 |
| 2026-10-03 00:00 |
08:28:01.63 |
+11:52:09.1 |
HIP 41518 |
9.77 |
| 2026-10-03 12:00 |
08:28:06.59 |
+11:51:36.7 |
HIP 41518 |
9.28 |
| 2026-10-04 00:00 |
08:28:11.48 |
+11:51:04.4 |
HIP 41518 |
8.95 |
| 2026-10-04 12:00 |
08:28:16.32 |
+11:50:32.3 |
HIP 41518 |
8.81 |
| 2026-10-05 00:00 |
08:28:21.09 |
+11:50:00.4 |
HIP 41518 |
8.86 |
| 2026-10-05 12:00 |
08:28:25.80 |
+11:49:28.5 |
HIP 41518 |
9.08 |
| 2026-10-06 00:00 |
08:28:30.45 |
+11:48:56.9 |
HIP 41518 |
9.46 |
| 2026-10-06 12:00 |
08:28:35.04 |
+11:48:25.3 |
HIP 41518 |
9.97 |
| 2026-10-07 00:00 |
08:28:39.57 |
+11:47:54.0 |
HIP 41518 |
10.59 |
| 2026-10-07 12:00 |
08:28:44.03 |
+11:47:22.8 |
HIP 41518 |
11.30 |
| 2026-10-08 00:00 |
08:28:48.43 |
+11:46:51.7 |
HIP 41518 |
12.07 |
| 2026-10-08 12:00 |
08:28:52.76 |
+11:46:20.8 |
HIP 41518 |
12.90 |
| 2026-10-09 00:00 |
08:28:57.03 |
+11:45:50.1 |
HIP 41518 |
13.76 |
| 2026-10-09 12:00 |
08:29:01.24 |
+11:45:19.6 |
HIP 41518 |
14.65 |
| 2026-10-10 00:00 |
08:29:05.38 |
+11:44:49.2 |
HIP 41518 |
15.55 |
| 2026-10-10 12:00 |
08:29:09.45 |
+11:44:19.0 |
HIP 41518 |
16.47 |
| 2026-10-11 00:00 |
08:29:13.46 |
+11:43:48.9 |
HIP 41518 |
17.40 |