| 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) |
| 2026-06-01 00:00 |
07:52:58.37 |
+13:54:16.8 |
HIP 38597 |
26.24 |
| 2026-06-01 12:00 |
07:53:06.01 |
+13:54:06.0 |
HIP 38597 |
24.88 |
| 2026-06-02 00:00 |
07:53:13.69 |
+13:53:54.8 |
HIP 38597 |
23.59 |
| 2026-06-02 12:00 |
07:53:21.42 |
+13:53:43.5 |
HIP 38597 |
22.36 |
| 2026-06-03 00:00 |
07:53:29.18 |
+13:53:31.9 |
HIP 38597 |
21.23 |
| 2026-06-03 12:00 |
07:53:36.99 |
+13:53:20.1 |
HIP 38597 |
20.20 |
| 2026-06-04 00:00 |
07:53:44.84 |
+13:53:08.1 |
HIP 38597 |
19.30 |
| 2026-06-04 12:00 |
07:53:52.73 |
+13:52:55.8 |
HIP 38597 |
18.55 |
| 2026-06-05 00:00 |
07:54:00.66 |
+13:52:43.3 |
HIP 38597 |
17.97 |
| 2026-06-05 12:00 |
07:54:08.63 |
+13:52:30.6 |
HIP 38597 |
17.57 |
| 2026-06-06 00:00 |
07:54:16.64 |
+13:52:17.6 |
HIP 38597 |
17.39 |
| 2026-06-06 12:00 |
07:54:24.69 |
+13:52:04.4 |
HIP 38597 |
17.42 |
| 2026-06-07 00:00 |
07:54:32.77 |
+13:51:51.0 |
HIP 38597 |
17.68 |
| 2026-06-07 12:00 |
07:54:40.89 |
+13:51:37.3 |
HIP 38597 |
18.14 |
| 2026-06-08 00:00 |
07:54:49.06 |
+13:51:23.4 |
HIP 38597 |
18.81 |
| 2026-06-08 12:00 |
07:54:57.25 |
+13:51:09.3 |
HIP 38597 |
19.66 |
| 2026-06-09 00:00 |
07:55:05.49 |
+13:50:55.0 |
HIP 38597 |
20.67 |
| 2026-06-09 12:00 |
07:55:13.76 |
+13:50:40.4 |
HIP 38597 |
21.83 |
| 2026-06-10 00:00 |
07:55:22.07 |
+13:50:25.6 |
HIP 38597 |
23.11 |
| 2026-06-10 12:00 |
07:55:30.41 |
+13:50:10.6 |
HIP 38597 |
24.49 |
| 2026-06-11 00:00 |
07:55:38.79 |
+13:49:55.3 |
HIP 38597 |
25.97 |
| 2026-06-11 12:00 |
07:55:47.20 |
+13:49:39.9 |
HIP 38597 |
27.52 |
| 2026-06-12 00:00 |
07:55:55.65 |
+13:49:24.2 |
HIP 38597 |
29.15 |
| 2026-06-12 12:00 |
07:56:04.13 |
+13:49:08.2 |
HIP 38730 |
29.57 |
| 2026-06-13 00:00 |
07:56:12.65 |
+13:48:52.1 |
HIP 38730 |
29.69 |
| 2026-06-13 12:00 |
07:56:21.19 |
+13:48:35.7 |
HIP 38730 |
29.96 |
| 2026-06-14 00:00 |
07:56:29.77 |
+13:48:19.1 |
HIP 38730 |
30.37 |
| 2026-06-14 12:00 |
07:56:38.39 |
+13:48:02.3 |
HIP 38730 |
30.92 |
| 2026-06-15 00:00 |
07:56:47.03 |
+13:47:45.2 |
HIP 38730 |
31.60 |
| 2026-06-15 12:00 |
07:56:55.70 |
+13:47:28.0 |
HIP 38874 |
31.80 |
| 2026-06-16 00:00 |
07:57:04.41 |
+13:47:10.5 |
HIP 38874 |
31.21 |
| 2026-06-16 12:00 |
07:57:13.15 |
+13:46:52.8 |
HIP 38954 |
30.55 |
| 2026-06-17 00:00 |
07:57:21.91 |
+13:46:34.8 |
HIP 38954 |
29.35 |
| 2026-06-17 12:00 |
07:57:30.70 |
+13:46:16.7 |
HIP 38954 |
28.26 |
| 2026-06-18 00:00 |
07:57:39.53 |
+13:45:58.3 |
HIP 38954 |
27.30 |
| 2026-06-18 12:00 |
07:57:48.38 |
+13:45:39.8 |
HIP 38954 |
26.47 |
| 2026-06-19 00:00 |
07:57:57.26 |
+13:45:21.0 |
HIP 38954 |
25.79 |
| 2026-06-19 12:00 |
07:58:06.16 |
+13:45:02.0 |
HIP 38954 |
25.29 |
| 2026-06-20 00:00 |
07:58:15.09 |
+13:44:42.7 |
HIP 38954 |
24.95 |
| 2026-06-20 12:00 |
07:58:24.05 |
+13:44:23.3 |
HIP 38954 |
24.81 |
| 2026-06-21 00:00 |
07:58:33.04 |
+13:44:03.7 |
HIP 38954 |
24.86 |
| 2026-06-21 12:00 |
07:58:42.05 |
+13:43:43.8 |
HIP 39127 |
23.08 |
| 2026-06-22 00:00 |
07:58:51.08 |
+13:43:23.8 |
HIP 39127 |
21.00 |