| Parameter |
Value |
| Designation |
P/2018 L4 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-07-31T20:14:06.267840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:44Z |
| Obs used |
129 |
| NEO |
- |
| M1 |
15.000 |
| K1 |
21.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2018-06-08T12:14:11.040000Z |
| Discovery magnitude (MPC) |
21.00 i |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-06-29.0000000 |
| e |
0.66033053 |
| q (au) |
1.676234 |
| a (au) |
4.934898 |
| i (deg) |
26.625477 |
| Ω (om, deg) |
145.193041 |
| ω (w, deg) |
140.432575 |
| M (ma, deg) |
357.047219 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.644 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.644 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.692 |
| k |
0.800 |
| δ90 |
10.000 |
| 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 |
08:49:02.17 |
+11:58:32.2 |
HIP 43121 |
31.87 |
| 2026-07-29 12:00 |
08:49:20.15 |
+11:57:45.5 |
HIP 43465 |
29.99 |
| 2026-07-30 00:00 |
08:49:38.13 |
+11:56:58.5 |
HIP 43465 |
25.69 |
| 2026-07-30 12:00 |
08:49:56.13 |
+11:56:11.2 |
HIP 43465 |
21.44 |
| 2026-07-31 00:00 |
08:50:14.13 |
+11:55:23.6 |
HIP 43465 |
17.31 |
| 2026-07-31 12:00 |
08:50:32.14 |
+11:54:35.7 |
HIP 43465 |
13.39 |
| 2026-08-01 00:00 |
08:50:50.16 |
+11:53:47.5 |
HIP 43465 |
9.95 |
| 2026-08-01 12:00 |
08:51:08.18 |
+11:52:59.0 |
HIP 43465 |
7.67 |
| 2026-08-02 00:00 |
08:51:26.21 |
+11:52:10.3 |
HIP 43491 |
4.97 |
| 2026-08-02 12:00 |
08:51:44.25 |
+11:51:21.2 |
HIP 43519 |
2.61 |
| 2026-08-03 00:00 |
08:52:02.29 |
+11:50:31.9 |
HIP 43519 |
4.44 |
| 2026-08-03 12:00 |
08:52:20.34 |
+11:49:42.3 |
HIP 43519 |
8.54 |
| 2026-08-04 00:00 |
08:52:38.39 |
+11:48:52.5 |
HIP 43519 |
12.91 |
| 2026-08-04 12:00 |
08:52:56.45 |
+11:48:02.3 |
HIP 43519 |
17.35 |
| 2026-08-05 00:00 |
08:53:14.51 |
+11:47:11.9 |
HIP 43519 |
21.81 |
| 2026-08-05 12:00 |
08:53:32.57 |
+11:46:21.2 |
HIP 43519 |
26.29 |
| 2026-08-06 00:00 |
08:53:50.63 |
+11:45:30.3 |
HIP 43519 |
30.77 |
| 2026-08-06 12:00 |
08:54:08.70 |
+11:44:39.1 |
HIP 43851 |
27.10 |
| 2026-08-07 00:00 |
08:54:26.76 |
+11:43:47.6 |
HIP 43851 |
22.61 |
| 2026-08-07 12:00 |
08:54:44.83 |
+11:42:55.9 |
HIP 43851 |
18.13 |
| 2026-08-08 00:00 |
08:55:02.89 |
+11:42:03.9 |
HIP 43851 |
13.66 |
| 2026-08-08 12:00 |
08:55:20.96 |
+11:41:11.7 |
HIP 43851 |
9.22 |
| 2026-08-09 00:00 |
08:55:39.02 |
+11:40:19.3 |
HIP 43851 |
4.90 |
| 2026-08-09 12:00 |
08:55:57.08 |
+11:39:26.6 |
HIP 43851 |
1.92 |
| 2026-08-10 00:00 |
08:56:15.14 |
+11:38:33.6 |
HIP 43851 |
4.90 |
| 2026-08-10 12:00 |
08:56:33.20 |
+11:37:40.4 |
HIP 43948 |
7.81 |
| 2026-08-11 00:00 |
08:56:51.25 |
+11:36:47.0 |
HIP 43948 |
3.90 |
| 2026-08-11 12:00 |
08:57:09.29 |
+11:35:53.4 |
HIP 43948 |
3.18 |
| 2026-08-12 00:00 |
08:57:27.33 |
+11:34:59.5 |
HIP 43948 |
6.76 |
| 2026-08-12 12:00 |
08:57:45.36 |
+11:34:05.4 |
HIP 43948 |
11.04 |
| 2026-08-13 00:00 |
08:58:03.39 |
+11:33:11.1 |
HIP 43948 |
15.45 |
| 2026-08-13 12:00 |
08:58:21.41 |
+11:32:16.6 |
HIP 44066 |
19.28 |
| 2026-08-14 00:00 |
08:58:39.42 |
+11:31:21.8 |
HIP 44066 |
20.26 |
| 2026-08-14 12:00 |
08:58:57.42 |
+11:30:26.9 |
HIP 44066 |
22.12 |
| 2026-08-15 00:00 |
08:59:15.41 |
+11:29:31.8 |
HIP 44066 |
24.68 |
| 2026-08-15 12:00 |
08:59:33.39 |
+11:28:36.4 |
HIP 44160 |
27.33 |
| 2026-08-16 00:00 |
08:59:51.36 |
+11:27:40.9 |
HIP 44160 |
28.40 |
| 2026-08-16 12:00 |
09:00:09.31 |
+11:26:45.1 |
HIP 44160 |
30.12 |
| 2026-08-17 00:00 |
09:00:27.26 |
+11:25:49.2 |
HIP 44160 |
32.37 |
| 2026-08-17 12:00 |
09:00:45.19 |
+11:24:53.1 |
HIP 44160 |
35.06 |
| 2026-08-18 00:00 |
09:01:03.11 |
+11:23:56.8 |
HIP 44160 |
38.09 |
| 2026-08-18 12:00 |
09:01:21.01 |
+11:23:00.4 |
HIP 44303 |
39.03 |
| 2026-08-19 00:00 |
09:01:38.90 |
+11:22:03.7 |
HIP 44497 |
36.41 |