| 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) |
| 2026-03-26 00:00 |
08:06:42.95 |
+11:16:18.1 |
HIP 39739 |
22.83 |
| 2026-03-26 12:00 |
08:06:39.19 |
+11:17:31.5 |
HIP 39739 |
24.32 |
| 2026-03-27 00:00 |
08:06:35.58 |
+11:18:44.4 |
HIP 39739 |
25.79 |
| 2026-03-27 12:00 |
08:06:32.11 |
+11:19:56.9 |
HIP 39739 |
27.25 |
| 2026-03-28 00:00 |
08:06:28.78 |
+11:21:08.9 |
HIP 39783 |
27.23 |
| 2026-03-28 12:00 |
08:06:25.59 |
+11:22:20.6 |
HIP 39783 |
26.98 |
| 2026-03-29 00:00 |
08:06:22.55 |
+11:23:31.8 |
HIP 39783 |
26.79 |
| 2026-03-29 12:00 |
08:06:19.65 |
+11:24:42.5 |
HIP 39783 |
26.64 |
| 2026-03-30 00:00 |
08:06:16.89 |
+11:25:52.9 |
HIP 39783 |
26.53 |
| 2026-03-30 12:00 |
08:06:14.28 |
+11:27:02.8 |
HIP 39783 |
26.47 |
| 2026-03-31 00:00 |
08:06:11.81 |
+11:28:12.2 |
HIP 39783 |
26.44 |
| 2026-03-31 12:00 |
08:06:09.49 |
+11:29:21.2 |
HIP 39783 |
26.45 |
| 2026-04-01 00:00 |
08:06:07.30 |
+11:30:29.7 |
HIP 39783 |
26.50 |
| 2026-04-01 12:00 |
08:06:05.26 |
+11:31:37.8 |
HIP 39783 |
26.57 |
| 2026-04-02 00:00 |
08:06:03.37 |
+11:32:45.4 |
HIP 39783 |
26.67 |
| 2026-04-02 12:00 |
08:06:01.62 |
+11:33:52.6 |
HIP 39783 |
26.79 |
| 2026-04-03 00:00 |
08:06:00.01 |
+11:34:59.3 |
HIP 39783 |
26.93 |
| 2026-04-03 12:00 |
08:05:58.54 |
+11:36:05.5 |
HIP 39783 |
27.09 |
| 2026-04-04 00:00 |
08:05:57.22 |
+11:37:11.3 |
HIP 39783 |
27.26 |
| 2026-04-04 12:00 |
08:05:56.04 |
+11:38:16.6 |
HIP 39783 |
27.44 |
| 2026-04-05 00:00 |
08:05:55.00 |
+11:39:21.4 |
HIP 39783 |
27.64 |
| 2026-04-05 12:00 |
08:05:54.11 |
+11:40:25.8 |
HIP 39783 |
27.84 |
| 2026-04-06 00:00 |
08:05:53.35 |
+11:41:29.7 |
HIP 39783 |
28.05 |
| 2026-04-06 12:00 |
08:05:52.75 |
+11:42:33.0 |
HIP 39783 |
28.26 |
| 2026-04-07 00:00 |
08:05:52.28 |
+11:43:36.0 |
HIP 39783 |
28.47 |
| 2026-04-07 12:00 |
08:05:51.96 |
+11:44:38.4 |
HIP 39783 |
28.69 |
| 2026-04-08 00:00 |
08:05:51.78 |
+11:45:40.3 |
HIP 39550 |
28.75 |
| 2026-04-08 12:00 |
08:05:51.74 |
+11:46:41.8 |
HIP 39550 |
27.86 |
| 2026-04-09 00:00 |
08:05:51.84 |
+11:47:42.7 |
HIP 39550 |
27.00 |
| 2026-04-09 12:00 |
08:05:52.09 |
+11:48:43.2 |
HIP 39550 |
26.18 |
| 2026-04-10 00:00 |
08:05:52.48 |
+11:49:43.1 |
HIP 39550 |
25.40 |
| 2026-04-10 12:00 |
08:05:53.00 |
+11:50:42.6 |
HIP 39550 |
24.66 |
| 2026-04-11 00:00 |
08:05:53.68 |
+11:51:41.5 |
HIP 39550 |
23.97 |
| 2026-04-11 12:00 |
08:05:54.49 |
+11:52:40.0 |
HIP 39550 |
23.33 |
| 2026-04-12 00:00 |
08:05:55.44 |
+11:53:37.9 |
HIP 39550 |
22.74 |
| 2026-04-12 12:00 |
08:05:56.54 |
+11:54:35.3 |
HIP 39550 |
22.22 |
| 2026-04-13 00:00 |
08:05:57.77 |
+11:55:32.2 |
HIP 39550 |
21.75 |
| 2026-04-13 12:00 |
08:05:59.15 |
+11:56:28.6 |
HIP 39550 |
21.36 |
| 2026-04-14 00:00 |
08:06:00.67 |
+11:57:24.5 |
HIP 39550 |
21.03 |
| 2026-04-14 12:00 |
08:06:02.33 |
+11:58:19.9 |
HIP 39550 |
20.78 |
| 2026-04-15 00:00 |
08:06:04.12 |
+11:59:14.7 |
HIP 39550 |
20.62 |
| 2026-04-15 12:00 |
08:06:06.06 |
+12:00:09.0 |
HIP 39550 |
20.53 |
| 2026-04-16 00:00 |
08:06:08.14 |
+12:01:02.8 |
HIP 39550 |
20.53 |