| Parameter |
Value |
| Designation |
P/2019 S2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-02-20T19:57:11.050560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:59Z |
| Obs used |
29 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-09-28T08:58:56.064000Z |
| Discovery magnitude (MPC) |
21.60 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-09-12.0000000 |
| e |
0.20666395 |
| q (au) |
3.755253 |
| a (au) |
4.733496 |
| i (deg) |
10.472992 |
| Ω (om, deg) |
93.123709 |
| ω (w, deg) |
216.744948 |
| M (ma, deg) |
19.444094 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.456 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.456 |
| n |
2.000 |
| gf |
0.804 |
| gb |
-0.500 |
| k |
0.858 |
| δ90 |
1.000 |
| 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 |
11:49:32.26 |
+14:00:10.9 |
HIP 57606 |
21.28 |
| 2026-05-12 12:00 |
11:49:27.55 |
+13:59:36.5 |
HIP 57606 |
21.07 |
| 2026-05-13 00:00 |
11:49:23.00 |
+13:59:00.7 |
HIP 57606 |
20.99 |
| 2026-05-13 12:00 |
11:49:18.64 |
+13:58:23.7 |
HIP 57606 |
21.01 |
| 2026-05-14 00:00 |
11:49:14.45 |
+13:57:45.3 |
HIP 57606 |
21.15 |
| 2026-05-14 12:00 |
11:49:10.43 |
+13:57:05.5 |
HIP 57606 |
21.39 |
| 2026-05-15 00:00 |
11:49:06.60 |
+13:56:24.5 |
HIP 57606 |
21.72 |
| 2026-05-15 12:00 |
11:49:02.94 |
+13:55:42.1 |
HIP 57606 |
22.14 |
| 2026-05-16 00:00 |
11:48:59.47 |
+13:54:58.4 |
HIP 57606 |
22.64 |
| 2026-05-16 12:00 |
11:48:56.17 |
+13:54:13.4 |
HIP 57606 |
23.22 |
| 2026-05-17 00:00 |
11:48:53.05 |
+13:53:27.1 |
HIP 57606 |
23.85 |
| 2026-05-17 12:00 |
11:48:50.11 |
+13:52:39.5 |
HIP 57606 |
24.55 |
| 2026-05-18 00:00 |
11:48:47.36 |
+13:51:50.6 |
HIP 57606 |
25.29 |
| 2026-05-18 12:00 |
11:48:44.78 |
+13:51:00.4 |
HIP 57606 |
26.09 |
| 2026-05-19 00:00 |
11:48:42.38 |
+13:50:09.0 |
HIP 57606 |
26.92 |
| 2026-05-19 12:00 |
11:48:40.16 |
+13:49:16.2 |
HIP 57606 |
27.78 |
| 2026-05-20 00:00 |
11:48:38.12 |
+13:48:22.3 |
HIP 57606 |
28.68 |
| 2026-05-20 12:00 |
11:48:36.27 |
+13:47:27.0 |
HIP 57606 |
29.61 |
| 2026-05-21 00:00 |
11:48:34.59 |
+13:46:30.5 |
HIP 57527 |
28.61 |
| 2026-05-21 12:00 |
11:48:33.10 |
+13:45:32.8 |
HIP 57527 |
27.61 |
| 2026-05-22 00:00 |
11:48:31.78 |
+13:44:33.9 |
HIP 57527 |
26.63 |
| 2026-05-22 12:00 |
11:48:30.64 |
+13:43:33.7 |
HIP 57527 |
25.67 |
| 2026-05-23 00:00 |
11:48:29.69 |
+13:42:32.3 |
HIP 57527 |
24.72 |
| 2026-05-23 12:00 |
11:48:28.91 |
+13:41:29.7 |
HIP 57527 |
23.79 |
| 2026-05-24 00:00 |
11:48:28.31 |
+13:40:26.0 |
HIP 57527 |
22.88 |
| 2026-05-24 12:00 |
11:48:27.90 |
+13:39:21.0 |
HIP 57527 |
22.01 |
| 2026-05-25 00:00 |
11:48:27.66 |
+13:38:14.8 |
HIP 57527 |
21.17 |
| 2026-05-25 12:00 |
11:48:27.60 |
+13:37:07.5 |
HIP 57527 |
20.38 |
| 2026-05-26 00:00 |
11:48:27.72 |
+13:35:59.0 |
HIP 57527 |
19.64 |
| 2026-05-26 12:00 |
11:48:28.01 |
+13:34:49.3 |
HIP 57527 |
18.96 |
| 2026-05-27 00:00 |
11:48:28.49 |
+13:33:38.5 |
HIP 57527 |
18.35 |
| 2026-05-27 12:00 |
11:48:29.14 |
+13:32:26.6 |
HIP 57527 |
17.83 |
| 2026-05-28 00:00 |
11:48:29.97 |
+13:31:13.5 |
HIP 57527 |
17.41 |
| 2026-05-28 12:00 |
11:48:30.97 |
+13:29:59.3 |
HIP 57527 |
17.10 |
| 2026-05-29 00:00 |
11:48:32.15 |
+13:28:44.0 |
HIP 57527 |
16.91 |
| 2026-05-29 12:00 |
11:48:33.51 |
+13:27:27.5 |
HIP 57527 |
16.85 |
| 2026-05-30 00:00 |
11:48:35.04 |
+13:26:10.0 |
HIP 57527 |
16.94 |
| 2026-05-30 12:00 |
11:48:36.75 |
+13:24:51.3 |
HIP 57527 |
17.17 |
| 2026-05-31 00:00 |
11:48:38.64 |
+13:23:31.6 |
HIP 57527 |
17.55 |
| 2026-05-31 12:00 |
11:48:40.70 |
+13:22:10.8 |
HIP 57527 |
18.08 |
| 2026-06-01 00:00 |
11:48:42.93 |
+13:20:48.9 |
HIP 57527 |
18.74 |
| 2026-06-01 12:00 |
11:48:45.34 |
+13:19:25.9 |
HIP 57527 |
19.54 |
| 2026-06-02 00:00 |
11:48:47.91 |
+13:18:01.9 |
HIP 57527 |
20.47 |