| Parameter |
Value |
| Designation |
P/2019 W1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2019-05-08T00:22:04.598400Z |
| Orbit solution date (soln_date, UTC) |
2023-01-14T00:13:19Z |
| Obs used |
78 |
| NEO |
- |
| M1 |
16.300 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-11-29T12:59:22.617600Z |
| Discovery magnitude (MPC) |
20.54 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-08-27.0000000 |
| e |
0.26600352 |
| q (au) |
3.339892 |
| a (au) |
4.550284 |
| i (deg) |
23.462131 |
| Ω (om, deg) |
35.426528 |
| ω (w, deg) |
18.751304 |
| M (ma, deg) |
11.269621 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.870 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.870 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.848 |
| k |
0.800 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
19:18:42.27 |
-47:24:05.1 |
HIP 95034 |
16.50 |
| 2026-09-25 12:00 |
19:18:47.53 |
-47:21:39.0 |
HIP 95034 |
16.89 |
| 2026-09-26 00:00 |
19:18:53.08 |
-47:19:12.4 |
HIP 94849 |
17.35 |
| 2026-09-26 12:00 |
19:18:58.91 |
-47:16:45.5 |
HIP 94849 |
15.94 |
| 2026-09-27 00:00 |
19:19:05.03 |
-47:14:18.2 |
HIP 94849 |
14.90 |
| 2026-09-27 12:00 |
19:19:11.44 |
-47:11:50.5 |
HIP 94849 |
14.33 |
| 2026-09-28 00:00 |
19:19:18.14 |
-47:09:22.5 |
HIP 94849 |
14.30 |
| 2026-09-28 12:00 |
19:19:25.12 |
-47:06:54.0 |
HIP 94849 |
14.83 |
| 2026-09-29 00:00 |
19:19:32.38 |
-47:04:25.3 |
HIP 94849 |
15.87 |
| 2026-09-29 12:00 |
19:19:39.92 |
-47:01:56.1 |
HIP 94849 |
17.35 |
| 2026-09-30 00:00 |
19:19:47.74 |
-46:59:26.7 |
HIP 94849 |
19.17 |
| 2026-09-30 12:00 |
19:19:55.84 |
-46:56:56.9 |
HIP 94849 |
21.26 |
| 2026-10-01 00:00 |
19:20:04.22 |
-46:54:26.8 |
HIP 95199 |
21.72 |
| 2026-10-01 12:00 |
19:20:12.88 |
-46:51:56.4 |
HIP 95199 |
19.45 |
| 2026-10-02 00:00 |
19:20:21.81 |
-46:49:25.7 |
HIP 95199 |
17.33 |
| 2026-10-02 12:00 |
19:20:31.02 |
-46:46:54.7 |
HIP 95199 |
15.43 |
| 2026-10-03 00:00 |
19:20:40.50 |
-46:44:23.4 |
HIP 95199 |
13.86 |
| 2026-10-03 12:00 |
19:20:50.25 |
-46:41:51.8 |
HIP 95199 |
12.76 |
| 2026-10-04 00:00 |
19:21:00.27 |
-46:39:20.0 |
HIP 95199 |
12.29 |
| 2026-10-04 12:00 |
19:21:10.57 |
-46:36:47.8 |
HIP 95199 |
12.54 |
| 2026-10-05 00:00 |
19:21:21.13 |
-46:34:15.5 |
HIP 95199 |
13.48 |
| 2026-10-05 12:00 |
19:21:31.97 |
-46:31:42.8 |
HIP 95199 |
15.02 |
| 2026-10-06 00:00 |
19:21:43.07 |
-46:29:10.0 |
HIP 95199 |
17.00 |
| 2026-10-06 12:00 |
19:21:54.43 |
-46:26:36.9 |
HIP 95198 |
16.81 |
| 2026-10-07 00:00 |
19:22:06.06 |
-46:24:03.5 |
HIP 95198 |
14.29 |
| 2026-10-07 12:00 |
19:22:17.95 |
-46:21:30.0 |
HIP 95198 |
12.13 |
| 2026-10-08 00:00 |
19:22:30.11 |
-46:18:56.2 |
HIP 95198 |
10.58 |
| 2026-10-08 12:00 |
19:22:42.52 |
-46:16:22.2 |
HIP 95198 |
9.97 |
| 2026-10-09 00:00 |
19:22:55.20 |
-46:13:48.0 |
HIP 95198 |
10.50 |
| 2026-10-09 12:00 |
19:23:08.13 |
-46:11:13.6 |
HIP 95198 |
12.04 |
| 2026-10-10 00:00 |
19:23:21.32 |
-46:08:39.1 |
HIP 95198 |
14.30 |
| 2026-10-10 12:00 |
19:23:34.76 |
-46:06:04.3 |
HIP 95198 |
17.00 |
| 2026-10-11 00:00 |
19:23:48.46 |
-46:03:29.4 |
HIP 95198 |
19.99 |
| 2026-10-11 12:00 |
19:24:02.41 |
-46:00:54.3 |
HIP 95198 |
23.17 |
| 2026-10-12 00:00 |
19:24:16.61 |
-45:58:19.0 |
HIP 95410 |
25.69 |
| 2026-10-12 12:00 |
19:24:31.06 |
-45:55:43.6 |
HIP 95578 |
22.76 |
| 2026-10-13 00:00 |
19:24:45.76 |
-45:53:08.0 |
HIP 95578 |
19.35 |
| 2026-10-13 12:00 |
19:25:00.70 |
-45:50:32.3 |
HIP 95578 |
15.99 |
| 2026-10-14 00:00 |
19:25:15.89 |
-45:47:56.5 |
HIP 95578 |
12.77 |
| 2026-10-14 12:00 |
19:25:31.32 |
-45:45:20.5 |
HIP 95578 |
9.83 |
| 2026-10-15 00:00 |
19:25:46.99 |
-45:42:44.3 |
HIP 95578 |
7.60 |
| 2026-10-15 12:00 |
19:26:02.90 |
-45:40:08.1 |
HIP 95578 |
6.85 |
| 2026-10-16 00:00 |
19:26:19.05 |
-45:37:31.7 |
HIP 95578 |
8.06 |