C/2018 P5 (PANSTARRS)
| 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
$$
M_a = (13.535 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.535 |
| n |
2.000 |
| gf |
0.902 |
| gb |
-0.890 |
| k |
1.000 |
| δ90 |
5.476 |
| 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) |
| 2026-02-03 00:00 |
07:52:55.30 |
+13:00:35.1 |
HIP 38598 |
30.93 |
| 2026-02-03 12:00 |
07:52:47.85 |
+13:01:01.4 |
HIP 38598 |
31.72 |
| 2026-02-04 00:00 |
07:52:40.43 |
+13:01:27.8 |
HIP 38598 |
32.59 |
| 2026-02-04 12:00 |
07:52:33.04 |
+13:01:54.2 |
HIP 38598 |
33.53 |
| 2026-02-05 00:00 |
07:52:25.69 |
+13:02:20.7 |
HIP 38598 |
34.54 |
| 2026-02-05 12:00 |
07:52:18.36 |
+13:02:47.3 |
HIP 38598 |
35.61 |
| 2026-02-06 00:00 |
07:52:11.08 |
+13:03:13.9 |
HIP 38598 |
36.74 |
| 2026-02-06 12:00 |
07:52:03.83 |
+13:03:40.5 |
HIP 38598 |
37.91 |
| 2026-02-07 00:00 |
07:51:56.61 |
+13:04:07.2 |
HIP 38196 |
38.33 |
| 2026-02-07 12:00 |
07:51:49.43 |
+13:04:34.0 |
HIP 38196 |
36.92 |
| 2026-02-08 00:00 |
07:51:42.29 |
+13:05:00.7 |
HIP 38196 |
35.55 |
| 2026-02-08 12:00 |
07:51:35.19 |
+13:05:27.6 |
HIP 38196 |
34.23 |
| 2026-02-09 00:00 |
07:51:28.12 |
+13:05:54.4 |
HIP 38196 |
32.97 |
| 2026-02-09 12:00 |
07:51:21.10 |
+13:06:21.3 |
HIP 38196 |
31.76 |
| 2026-02-10 00:00 |
07:51:14.12 |
+13:06:48.3 |
HIP 38196 |
30.61 |
| 2026-02-10 12:00 |
07:51:07.17 |
+13:07:15.2 |
HIP 38196 |
29.54 |
| 2026-02-11 00:00 |
07:51:00.28 |
+13:07:42.2 |
HIP 38196 |
28.54 |
| 2026-02-11 12:00 |
07:50:53.42 |
+13:08:09.2 |
HIP 38196 |
27.62 |
| 2026-02-12 00:00 |
07:50:46.61 |
+13:08:36.2 |
HIP 38196 |
26.79 |
| 2026-02-12 12:00 |
07:50:39.84 |
+13:09:03.3 |
HIP 38196 |
26.05 |
| 2026-02-13 00:00 |
07:50:33.12 |
+13:09:30.3 |
HIP 38196 |
25.41 |
| 2026-02-13 12:00 |
07:50:26.45 |
+13:09:57.4 |
HIP 38147 |
24.02 |
| 2026-02-14 00:00 |
07:50:19.82 |
+13:10:24.5 |
HIP 38147 |
22.40 |
| 2026-02-14 12:00 |
07:50:13.24 |
+13:10:51.5 |
HIP 38147 |
20.81 |
| 2026-02-15 00:00 |
07:50:06.71 |
+13:11:18.6 |
HIP 38147 |
19.24 |
| 2026-02-15 12:00 |
07:50:00.22 |
+13:11:45.7 |
HIP 38147 |
17.70 |
| 2026-02-16 00:00 |
07:49:53.79 |
+13:12:12.8 |
HIP 38147 |
16.18 |
| 2026-02-16 12:00 |
07:49:47.41 |
+13:12:39.9 |
HIP 38147 |
14.70 |
| 2026-02-17 00:00 |
07:49:41.08 |
+13:13:06.9 |
HIP 38147 |
13.26 |
| 2026-02-17 12:00 |
07:49:34.80 |
+13:13:34.0 |
HIP 38147 |
11.87 |
| 2026-02-18 00:00 |
07:49:28.58 |
+13:14:01.0 |
HIP 38147 |
10.55 |
| 2026-02-18 12:00 |
07:49:22.41 |
+13:14:28.0 |
HIP 38147 |
9.31 |
| 2026-02-19 00:00 |
07:49:16.29 |
+13:14:55.0 |
HIP 38147 |
8.19 |
| 2026-02-19 12:00 |
07:49:10.23 |
+13:15:22.0 |
HIP 38147 |
7.24 |
| 2026-02-20 00:00 |
07:49:04.22 |
+13:15:48.9 |
HIP 38147 |
6.52 |
| 2026-02-20 12:00 |
07:48:58.27 |
+13:16:15.8 |
HIP 38147 |
6.11 |
| 2026-02-21 00:00 |
07:48:52.38 |
+13:16:42.7 |
HIP 38147 |
6.05 |
| 2026-02-21 12:00 |
07:48:46.54 |
+13:17:09.5 |
HIP 38147 |
6.35 |
| 2026-02-22 00:00 |
07:48:40.77 |
+13:17:36.3 |
HIP 38147 |
6.96 |
| 2026-02-22 12:00 |
07:48:35.05 |
+13:18:03.1 |
HIP 38094 |
7.65 |
| 2026-02-23 00:00 |
07:48:29.39 |
+13:18:29.8 |
HIP 38094 |
6.79 |
| 2026-02-23 12:00 |
07:48:23.79 |
+13:18:56.5 |
HIP 38094 |
6.17 |
| 2026-02-24 00:00 |
07:48:18.25 |
+13:19:23.1 |
HIP 38094 |
5.83 |