| 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
$$
M_a = (16.472 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.472 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.854 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
11:48:50.67 |
+13:16:36.9 |
HIP 57527 |
21.51 |
| 2026-06-03 00:00 |
11:48:53.59 |
+13:15:10.7 |
HIP 57527 |
22.65 |
| 2026-06-03 12:00 |
11:48:56.69 |
+13:13:43.6 |
HIP 57721 |
22.92 |
| 2026-06-04 00:00 |
11:48:59.96 |
+13:12:15.4 |
HIP 57721 |
21.45 |
| 2026-06-04 12:00 |
11:49:03.40 |
+13:10:46.1 |
HIP 57721 |
19.96 |
| 2026-06-05 00:00 |
11:49:07.01 |
+13:09:15.9 |
HIP 57721 |
18.47 |
| 2026-06-05 12:00 |
11:49:10.79 |
+13:07:44.6 |
HIP 57721 |
16.99 |
| 2026-06-06 00:00 |
11:49:14.75 |
+13:06:12.4 |
HIP 57721 |
15.51 |
| 2026-06-06 12:00 |
11:49:18.87 |
+13:04:39.1 |
HIP 57721 |
14.08 |
| 2026-06-07 00:00 |
11:49:23.16 |
+13:03:04.8 |
HIP 57721 |
12.70 |
| 2026-06-07 12:00 |
11:49:27.62 |
+13:01:29.6 |
HIP 57721 |
11.44 |
| 2026-06-08 00:00 |
11:49:32.25 |
+12:59:53.4 |
HIP 57721 |
10.33 |
| 2026-06-08 12:00 |
11:49:37.05 |
+12:58:16.2 |
HIP 57721 |
9.47 |
| 2026-06-09 00:00 |
11:49:42.01 |
+12:56:38.0 |
HIP 57721 |
8.95 |
| 2026-06-09 12:00 |
11:49:47.14 |
+12:54:58.8 |
HIP 57721 |
8.86 |
| 2026-06-10 00:00 |
11:49:52.44 |
+12:53:18.7 |
HIP 57662 |
8.56 |
| 2026-06-10 12:00 |
11:49:57.90 |
+12:51:37.7 |
HIP 57662 |
8.16 |
| 2026-06-11 00:00 |
11:50:03.53 |
+12:49:55.7 |
HIP 57662 |
8.34 |
| 2026-06-11 12:00 |
11:50:09.33 |
+12:48:12.8 |
HIP 57662 |
9.10 |
| 2026-06-12 00:00 |
11:50:15.29 |
+12:46:28.9 |
HIP 57662 |
10.33 |
| 2026-06-12 12:00 |
11:50:21.41 |
+12:44:44.1 |
HIP 57662 |
11.91 |
| 2026-06-13 00:00 |
11:50:27.70 |
+12:42:58.4 |
HIP 57662 |
13.73 |
| 2026-06-13 12:00 |
11:50:34.15 |
+12:41:11.8 |
HIP 57662 |
15.74 |
| 2026-06-14 00:00 |
11:50:40.76 |
+12:39:24.3 |
HIP 57662 |
17.88 |
| 2026-06-14 12:00 |
11:50:47.54 |
+12:37:35.9 |
HIP 57662 |
20.12 |
| 2026-06-15 00:00 |
11:50:54.48 |
+12:35:46.6 |
HIP 57779 |
19.04 |
| 2026-06-15 12:00 |
11:51:01.58 |
+12:33:56.4 |
HIP 57779 |
17.27 |
| 2026-06-16 00:00 |
11:51:08.84 |
+12:32:05.3 |
HIP 57779 |
15.70 |
| 2026-06-16 12:00 |
11:51:16.25 |
+12:30:13.4 |
HIP 57779 |
14.41 |
| 2026-06-17 00:00 |
11:51:23.83 |
+12:28:20.6 |
HIP 57779 |
13.52 |
| 2026-06-17 12:00 |
11:51:31.57 |
+12:26:27.0 |
HIP 57779 |
13.12 |
| 2026-06-18 00:00 |
11:51:39.46 |
+12:24:32.5 |
HIP 57779 |
13.29 |
| 2026-06-18 12:00 |
11:51:47.51 |
+12:22:37.2 |
HIP 57779 |
14.02 |
| 2026-06-19 00:00 |
11:51:55.72 |
+12:20:41.0 |
HIP 57779 |
15.25 |
| 2026-06-19 12:00 |
11:52:04.08 |
+12:18:44.1 |
HIP 57779 |
16.89 |
| 2026-06-20 00:00 |
11:52:12.60 |
+12:16:46.3 |
HIP 57779 |
18.85 |
| 2026-06-20 12:00 |
11:52:21.26 |
+12:14:47.7 |
HIP 57779 |
21.06 |
| 2026-06-21 00:00 |
11:52:30.09 |
+12:12:48.4 |
HIP 57779 |
23.46 |
| 2026-06-21 12:00 |
11:52:39.06 |
+12:10:48.2 |
HIP 58031 |
22.73 |
| 2026-06-22 00:00 |
11:52:48.18 |
+12:08:47.3 |
HIP 58031 |
20.01 |