P/2019 S2 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
12:27:18.23 |
+10:01:23.4 |
HIP 60628 |
30.98 |
| 2026-02-03 12:00 |
12:27:13.62 |
+10:02:59.7 |
HIP 60628 |
30.92 |
| 2026-02-04 00:00 |
12:27:08.84 |
+10:04:36.9 |
HIP 60628 |
30.96 |
| 2026-02-04 12:00 |
12:27:03.87 |
+10:06:14.9 |
HIP 60628 |
31.11 |
| 2026-02-05 00:00 |
12:26:58.72 |
+10:07:53.7 |
HIP 60628 |
31.36 |
| 2026-02-05 12:00 |
12:26:53.39 |
+10:09:33.4 |
HIP 60628 |
31.74 |
| 2026-02-06 00:00 |
12:26:47.89 |
+10:11:13.8 |
HIP 60628 |
32.23 |
| 2026-02-06 12:00 |
12:26:42.20 |
+10:12:55.1 |
HIP 60628 |
32.85 |
| 2026-02-07 00:00 |
12:26:36.34 |
+10:14:37.1 |
HIP 60628 |
33.58 |
| 2026-02-07 12:00 |
12:26:30.30 |
+10:16:19.9 |
HIP 60510 |
32.87 |
| 2026-02-08 00:00 |
12:26:24.08 |
+10:18:03.4 |
HIP 60510 |
31.32 |
| 2026-02-08 12:00 |
12:26:17.69 |
+10:19:47.7 |
HIP 60510 |
29.83 |
| 2026-02-09 00:00 |
12:26:11.11 |
+10:21:32.7 |
HIP 60510 |
28.42 |
| 2026-02-09 12:00 |
12:26:04.37 |
+10:23:18.4 |
HIP 60510 |
27.09 |
| 2026-02-10 00:00 |
12:25:57.45 |
+10:25:04.8 |
HIP 60510 |
25.89 |
| 2026-02-10 12:00 |
12:25:50.35 |
+10:26:51.8 |
HIP 60510 |
24.84 |
| 2026-02-11 00:00 |
12:25:43.09 |
+10:28:39.6 |
HIP 60510 |
23.98 |
| 2026-02-11 12:00 |
12:25:35.65 |
+10:30:28.0 |
HIP 60510 |
23.33 |
| 2026-02-12 00:00 |
12:25:28.04 |
+10:32:17.0 |
HIP 60510 |
22.92 |
| 2026-02-12 12:00 |
12:25:20.26 |
+10:34:06.6 |
HIP 60510 |
22.79 |
| 2026-02-13 00:00 |
12:25:12.31 |
+10:35:56.9 |
HIP 60510 |
22.94 |
| 2026-02-13 12:00 |
12:25:04.19 |
+10:37:47.7 |
HIP 60510 |
23.39 |
| 2026-02-14 00:00 |
12:24:55.91 |
+10:39:39.1 |
HIP 60510 |
24.14 |
| 2026-02-14 12:00 |
12:24:47.46 |
+10:41:31.0 |
HIP 60510 |
25.16 |
| 2026-02-15 00:00 |
12:24:38.84 |
+10:43:23.5 |
HIP 60510 |
26.44 |
| 2026-02-15 12:00 |
12:24:30.06 |
+10:45:16.5 |
HIP 60527 |
24.81 |
| 2026-02-16 00:00 |
12:24:21.12 |
+10:47:10.0 |
HIP 60527 |
22.99 |
| 2026-02-16 12:00 |
12:24:12.02 |
+10:49:03.9 |
HIP 60527 |
21.40 |
| 2026-02-17 00:00 |
12:24:02.76 |
+10:50:58.4 |
HIP 60527 |
20.12 |
| 2026-02-17 12:00 |
12:23:53.34 |
+10:52:53.2 |
HIP 60527 |
19.22 |
| 2026-02-18 00:00 |
12:23:43.76 |
+10:54:48.5 |
HIP 60527 |
18.79 |
| 2026-02-18 12:00 |
12:23:34.02 |
+10:56:44.2 |
HIP 60527 |
18.86 |
| 2026-02-19 00:00 |
12:23:24.14 |
+10:58:40.3 |
HIP 60527 |
19.45 |
| 2026-02-19 12:00 |
12:23:14.10 |
+11:00:36.7 |
HIP 60527 |
20.53 |
| 2026-02-20 00:00 |
12:23:03.91 |
+11:02:33.5 |
HIP 60527 |
22.04 |
| 2026-02-20 12:00 |
12:22:53.57 |
+11:04:30.6 |
HIP 60527 |
23.91 |
| 2026-02-21 00:00 |
12:22:43.08 |
+11:06:28.0 |
HIP 60527 |
26.07 |
| 2026-02-21 12:00 |
12:22:32.45 |
+11:08:25.7 |
HIP 60325 |
26.33 |
| 2026-02-22 00:00 |
12:22:21.67 |
+11:10:23.6 |
HIP 60325 |
23.93 |
| 2026-02-22 12:00 |
12:22:10.75 |
+11:12:21.8 |
HIP 60325 |
21.76 |
| 2026-02-23 00:00 |
12:21:59.69 |
+11:14:20.3 |
HIP 60325 |
19.90 |
| 2026-02-23 12:00 |
12:21:48.49 |
+11:16:18.9 |
HIP 60325 |
18.48 |
| 2026-02-24 00:00 |
12:21:37.15 |
+11:18:17.7 |
HIP 60325 |
17.62 |