| 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) |
| 2026-07-29 00:00 |
08:10:37.97 |
+13:10:09.9 |
HIP 40151 |
23.30 |
| 2026-07-29 12:00 |
08:10:47.62 |
+13:09:37.2 |
HIP 40151 |
21.74 |
| 2026-07-30 00:00 |
08:10:57.27 |
+13:09:04.4 |
HIP 40151 |
20.36 |
| 2026-07-30 12:00 |
08:11:06.90 |
+13:08:31.5 |
HIP 40151 |
19.18 |
| 2026-07-31 00:00 |
08:11:16.53 |
+13:07:58.4 |
HIP 40151 |
18.25 |
| 2026-07-31 12:00 |
08:11:26.14 |
+13:07:25.3 |
HIP 40151 |
17.60 |
| 2026-08-01 00:00 |
08:11:35.75 |
+13:06:52.0 |
HIP 40151 |
17.27 |
| 2026-08-01 12:00 |
08:11:45.35 |
+13:06:18.6 |
HIP 40151 |
17.27 |
| 2026-08-02 00:00 |
08:11:54.93 |
+13:05:45.1 |
HIP 40151 |
17.60 |
| 2026-08-02 12:00 |
08:12:04.50 |
+13:05:11.5 |
HIP 40151 |
18.25 |
| 2026-08-03 00:00 |
08:12:14.07 |
+13:04:37.8 |
HIP 40151 |
19.18 |
| 2026-08-03 12:00 |
08:12:23.62 |
+13:04:03.9 |
HIP 40151 |
20.35 |
| 2026-08-04 00:00 |
08:12:33.16 |
+13:03:30.0 |
HIP 40151 |
21.72 |
| 2026-08-04 12:00 |
08:12:42.68 |
+13:02:56.0 |
HIP 40151 |
23.25 |
| 2026-08-05 00:00 |
08:12:52.19 |
+13:02:21.8 |
HIP 40354 |
21.64 |
| 2026-08-05 12:00 |
08:13:01.69 |
+13:01:47.6 |
HIP 40354 |
19.35 |
| 2026-08-06 00:00 |
08:13:11.18 |
+13:01:13.3 |
HIP 40354 |
17.09 |
| 2026-08-06 12:00 |
08:13:20.65 |
+13:00:38.8 |
HIP 40354 |
14.87 |
| 2026-08-07 00:00 |
08:13:30.10 |
+13:00:04.3 |
HIP 40354 |
12.72 |
| 2026-08-07 12:00 |
08:13:39.54 |
+12:59:29.7 |
HIP 40354 |
10.66 |
| 2026-08-08 00:00 |
08:13:48.97 |
+12:58:55.0 |
HIP 40354 |
8.76 |
| 2026-08-08 12:00 |
08:13:58.38 |
+12:58:20.1 |
HIP 40354 |
7.16 |
| 2026-08-09 00:00 |
08:14:07.77 |
+12:57:45.2 |
HIP 40354 |
6.07 |
| 2026-08-09 12:00 |
08:14:17.14 |
+12:57:10.3 |
HIP 40354 |
5.81 |
| 2026-08-10 00:00 |
08:14:26.50 |
+12:56:35.2 |
HIP 40375 |
5.32 |
| 2026-08-10 12:00 |
08:14:35.84 |
+12:56:00.0 |
HIP 40375 |
5.36 |
| 2026-08-11 00:00 |
08:14:45.16 |
+12:55:24.8 |
HIP 40375 |
6.33 |
| 2026-08-11 12:00 |
08:14:54.46 |
+12:54:49.5 |
HIP 40375 |
7.91 |
| 2026-08-12 00:00 |
08:15:03.74 |
+12:54:14.1 |
HIP 40375 |
9.79 |
| 2026-08-12 12:00 |
08:15:13.00 |
+12:53:38.6 |
HIP 40375 |
11.83 |
| 2026-08-13 00:00 |
08:15:22.24 |
+12:53:03.1 |
HIP 40375 |
13.96 |
| 2026-08-13 12:00 |
08:15:31.46 |
+12:52:27.5 |
HIP 40375 |
16.14 |
| 2026-08-14 00:00 |
08:15:40.65 |
+12:51:51.8 |
HIP 40375 |
18.36 |
| 2026-08-14 12:00 |
08:15:49.83 |
+12:51:16.0 |
HIP 40375 |
20.59 |
| 2026-08-15 00:00 |
08:15:58.98 |
+12:50:40.2 |
HIP 40375 |
22.83 |
| 2026-08-15 12:00 |
08:16:08.11 |
+12:50:04.3 |
HIP 40375 |
25.08 |
| 2026-08-16 00:00 |
08:16:17.22 |
+12:49:28.4 |
HIP 40375 |
27.34 |
| 2026-08-16 12:00 |
08:16:26.30 |
+12:48:52.4 |
HIP 40375 |
29.60 |
| 2026-08-17 00:00 |
08:16:35.36 |
+12:48:16.3 |
HIP 40686 |
29.75 |
| 2026-08-17 12:00 |
08:16:44.40 |
+12:47:40.2 |
HIP 40686 |
27.54 |
| 2026-08-18 00:00 |
08:16:53.41 |
+12:47:04.1 |
HIP 40686 |
25.35 |
| 2026-08-18 12:00 |
08:17:02.39 |
+12:46:27.8 |
HIP 40686 |
23.18 |
| 2026-08-19 00:00 |
08:17:11.35 |
+12:45:51.6 |
HIP 40686 |
21.03 |