| Parameter |
Value |
| Designation |
C/2019 L1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-08-11T06:51:01.670400Z |
| Orbit solution date (soln_date, UTC) |
2023-01-14T00:12:29Z |
| Obs used |
103 |
| NEO |
- |
| M1 |
13.500 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-06-12T12:39:55.872000Z |
| Discovery magnitude (MPC) |
20.10 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-07-10.0000000 |
| e |
0.70662278 |
| q (au) |
2.890226 |
| a (au) |
9.851568 |
| i (deg) |
9.993558 |
| Ω (om, deg) |
254.409692 |
| ω (w, deg) |
49.919599 |
| M (ma, deg) |
358.970912 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.057 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.057 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.790 |
| k |
0.995 |
| 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) |
| 2026-05-12 00:00 |
06:07:25.56 |
+20:07:54.7 |
HIP 28958 |
10.30 |
| 2026-05-12 12:00 |
06:07:34.14 |
+20:07:54.2 |
HIP 28958 |
12.29 |
| 2026-05-13 00:00 |
06:07:42.76 |
+20:07:53.6 |
HIP 28958 |
14.30 |
| 2026-05-13 12:00 |
06:07:51.42 |
+20:07:53.0 |
HIP 28958 |
16.32 |
| 2026-05-14 00:00 |
06:08:00.12 |
+20:07:52.2 |
HIP 28958 |
18.35 |
| 2026-05-14 12:00 |
06:08:08.87 |
+20:07:51.4 |
HIP 28958 |
20.40 |
| 2026-05-15 00:00 |
06:08:17.65 |
+20:07:50.5 |
HIP 28958 |
22.45 |
| 2026-05-15 12:00 |
06:08:26.47 |
+20:07:49.5 |
HIP 28958 |
24.52 |
| 2026-05-16 00:00 |
06:08:35.34 |
+20:07:48.4 |
HIP 29216 |
26.21 |
| 2026-05-16 12:00 |
06:08:44.24 |
+20:07:47.3 |
HIP 29216 |
25.09 |
| 2026-05-17 00:00 |
06:08:53.18 |
+20:07:46.0 |
HIP 29216 |
24.09 |
| 2026-05-17 12:00 |
06:09:02.16 |
+20:07:44.7 |
HIP 29216 |
23.23 |
| 2026-05-18 00:00 |
06:09:11.18 |
+20:07:43.2 |
HIP 29216 |
22.54 |
| 2026-05-18 12:00 |
06:09:20.23 |
+20:07:41.7 |
HIP 29216 |
22.03 |
| 2026-05-19 00:00 |
06:09:29.32 |
+20:07:40.1 |
HIP 29216 |
21.72 |
| 2026-05-19 12:00 |
06:09:38.45 |
+20:07:38.4 |
HIP 29216 |
21.62 |
| 2026-05-20 00:00 |
06:09:47.61 |
+20:07:36.6 |
HIP 29216 |
21.73 |
| 2026-05-20 12:00 |
06:09:56.80 |
+20:07:34.7 |
HIP 29216 |
22.05 |
| 2026-05-21 00:00 |
06:10:06.03 |
+20:07:32.7 |
HIP 29216 |
22.58 |
| 2026-05-21 12:00 |
06:10:15.29 |
+20:07:30.6 |
HIP 29216 |
23.30 |
| 2026-05-22 00:00 |
06:10:24.59 |
+20:07:28.5 |
HIP 29216 |
24.21 |
| 2026-05-22 12:00 |
06:10:33.92 |
+20:07:26.2 |
HIP 29216 |
25.27 |
| 2026-05-23 00:00 |
06:10:43.28 |
+20:07:23.9 |
HIP 29216 |
26.48 |
| 2026-05-23 12:00 |
06:10:52.67 |
+20:07:21.4 |
HIP 29433 |
25.64 |
| 2026-05-24 00:00 |
06:11:02.09 |
+20:07:18.9 |
HIP 29433 |
24.27 |
| 2026-05-24 12:00 |
06:11:11.54 |
+20:07:16.3 |
HIP 29433 |
23.03 |
| 2026-05-25 00:00 |
06:11:21.03 |
+20:07:13.5 |
HIP 29433 |
21.94 |
| 2026-05-25 12:00 |
06:11:30.54 |
+20:07:10.7 |
HIP 29501 |
20.81 |
| 2026-05-26 00:00 |
06:11:40.08 |
+20:07:07.8 |
HIP 29501 |
18.59 |
| 2026-05-26 12:00 |
06:11:49.65 |
+20:07:04.8 |
HIP 29501 |
16.36 |
| 2026-05-27 00:00 |
06:11:59.24 |
+20:07:01.7 |
HIP 29501 |
14.14 |
| 2026-05-27 12:00 |
06:12:08.87 |
+20:06:58.5 |
HIP 29501 |
11.92 |
| 2026-05-28 00:00 |
06:12:18.52 |
+20:06:55.2 |
HIP 29501 |
9.72 |
| 2026-05-28 12:00 |
06:12:28.20 |
+20:06:51.8 |
HIP 29501 |
7.54 |
| 2026-05-29 00:00 |
06:12:37.90 |
+20:06:48.4 |
HIP 29501 |
5.43 |
| 2026-05-29 12:00 |
06:12:47.63 |
+20:06:44.8 |
HIP 29501 |
3.55 |
| 2026-05-30 00:00 |
06:12:57.39 |
+20:06:41.1 |
HIP 29501 |
2.46 |
| 2026-05-30 12:00 |
06:13:07.17 |
+20:06:37.3 |
HIP 29501 |
3.17 |
| 2026-05-31 00:00 |
06:13:16.97 |
+20:06:33.5 |
HIP 29501 |
4.97 |
| 2026-05-31 12:00 |
06:13:26.80 |
+20:06:29.5 |
HIP 29501 |
7.07 |
| 2026-06-01 00:00 |
06:13:36.65 |
+20:06:25.4 |
HIP 29587 |
7.89 |
| 2026-06-01 12:00 |
06:13:46.52 |
+20:06:21.3 |
HIP 29587 |
6.00 |
| 2026-06-02 00:00 |
06:13:56.42 |
+20:06:17.0 |
HIP 29587 |
4.52 |