P/2019 X2 (PANSTARRS)
| Parameter |
Value |
| Designation |
P/2019 X2 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-12-09T07:29:31.522560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:01Z |
| Obs used |
49 |
| NEO |
- |
| M1 |
18.100 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-12-04T13:53:07.584000Z |
| Discovery magnitude (MPC) |
21.60 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-12-28.0000000 |
| e |
0.49925561 |
| q (au) |
1.824131 |
| a (au) |
3.642840 |
| i (deg) |
15.881613 |
| Ω (om, deg) |
250.856818 |
| ω (w, deg) |
213.558832 |
| M (ma, deg) |
2.649128 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 3.550\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
3.550 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.936 |
| 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) |
| 2026-02-03 00:00 |
23:20:37.97 |
+08:24:55.5 |
HIP 115324 |
13.98 |
| 2026-02-03 12:00 |
23:21:18.81 |
+08:27:36.0 |
HIP 115324 |
8.13 |
| 2026-02-04 00:00 |
23:21:59.76 |
+08:30:17.7 |
HIP 115324 |
12.49 |
| 2026-02-04 12:00 |
23:22:40.82 |
+08:33:00.6 |
HIP 115393 |
19.64 |
| 2026-02-05 00:00 |
23:23:22.00 |
+08:35:44.7 |
HIP 115393 |
25.52 |
| 2026-02-05 12:00 |
23:24:03.28 |
+08:38:30.0 |
HIP 115393 |
33.79 |
| 2026-02-06 00:00 |
23:24:44.68 |
+08:41:16.5 |
HIP 115680 |
24.86 |
| 2026-02-06 12:00 |
23:25:26.20 |
+08:44:04.2 |
HIP 115680 |
14.80 |
| 2026-02-07 00:00 |
23:26:07.82 |
+08:46:53.1 |
HIP 115680 |
6.79 |
| 2026-02-07 12:00 |
23:26:49.56 |
+08:49:43.2 |
HIP 115680 |
10.04 |
| 2026-02-08 00:00 |
23:27:31.40 |
+08:52:34.5 |
HIP 115838 |
16.80 |
| 2026-02-08 12:00 |
23:28:13.36 |
+08:55:26.9 |
HIP 115838 |
17.70 |
| 2026-02-09 00:00 |
23:28:55.42 |
+08:58:20.5 |
HIP 115838 |
24.02 |
| 2026-02-09 12:00 |
23:29:37.60 |
+09:01:15.2 |
HIP 115871 |
29.31 |
| 2026-02-10 00:00 |
23:30:19.88 |
+09:04:11.1 |
HIP 116116 |
25.16 |
| 2026-02-10 12:00 |
23:31:02.27 |
+09:07:08.1 |
HIP 116116 |
15.51 |
| 2026-02-11 00:00 |
23:31:44.77 |
+09:10:06.2 |
HIP 116116 |
9.19 |
| 2026-02-11 12:00 |
23:32:27.38 |
+09:13:05.5 |
HIP 116116 |
12.89 |
| 2026-02-12 00:00 |
23:33:10.10 |
+09:16:05.8 |
HIP 116116 |
22.09 |
| 2026-02-12 12:00 |
23:33:52.92 |
+09:19:07.3 |
HIP 116334 |
14.69 |
| 2026-02-13 00:00 |
23:34:35.85 |
+09:22:09.9 |
HIP 116334 |
10.56 |
| 2026-02-13 12:00 |
23:35:18.89 |
+09:25:13.5 |
HIP 116334 |
15.82 |
| 2026-02-14 00:00 |
23:36:02.03 |
+09:28:18.2 |
HIP 116334 |
25.18 |
| 2026-02-14 12:00 |
23:36:45.28 |
+09:31:24.0 |
HIP 116466 |
34.05 |
| 2026-02-15 00:00 |
23:37:28.63 |
+09:34:30.9 |
HIP 116768 |
36.59 |
| 2026-02-15 12:00 |
23:38:12.09 |
+09:37:38.8 |
HIP 116768 |
25.54 |
| 2026-02-16 00:00 |
23:38:55.65 |
+09:40:47.8 |
HIP 116768 |
14.62 |
| 2026-02-16 12:00 |
23:39:39.32 |
+09:43:57.8 |
HIP 116768 |
5.10 |
| 2026-02-17 00:00 |
23:40:23.08 |
+09:47:08.9 |
HIP 116768 |
9.50 |
| 2026-02-17 12:00 |
23:41:06.96 |
+09:50:20.9 |
HIP 116768 |
20.22 |
| 2026-02-18 00:00 |
23:41:50.93 |
+09:53:34.0 |
HIP 116978 |
14.33 |
| 2026-02-18 12:00 |
23:42:35.00 |
+09:56:48.1 |
HIP 116978 |
5.05 |
| 2026-02-19 00:00 |
23:43:19.18 |
+10:00:03.1 |
HIP 116978 |
10.14 |
| 2026-02-19 12:00 |
23:44:03.46 |
+10:03:19.2 |
HIP 117020 |
19.41 |
| 2026-02-20 00:00 |
23:44:47.84 |
+10:06:36.2 |
HIP 117173 |
9.34 |
| 2026-02-20 12:00 |
23:45:32.32 |
+10:09:54.2 |
HIP 117173 |
2.74 |
| 2026-02-21 00:00 |
23:46:16.89 |
+10:13:13.1 |
HIP 117235 |
3.53 |
| 2026-02-21 12:00 |
23:47:01.57 |
+10:16:33.0 |
HIP 117235 |
10.72 |
| 2026-02-22 00:00 |
23:47:46.35 |
+10:19:53.8 |
HIP 117468 |
21.50 |
| 2026-02-22 12:00 |
23:48:31.22 |
+10:23:15.6 |
HIP 117468 |
13.96 |
| 2026-02-23 00:00 |
23:49:16.19 |
+10:26:38.2 |
HIP 117468 |
13.95 |
| 2026-02-23 12:00 |
23:50:01.26 |
+10:30:01.8 |
HIP 117468 |
21.51 |
| 2026-02-24 00:00 |
23:50:46.43 |
+10:33:26.2 |
HIP 117468 |
31.64 |