| 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) |
| 2026-06-01 00:00 |
20:18:40.48 |
-46:37:29.8 |
HIP 100223 |
15.34 |
| 2026-06-01 12:00 |
20:18:33.67 |
-46:40:14.2 |
HIP 100223 |
18.21 |
| 2026-06-02 00:00 |
20:18:26.57 |
-46:42:58.6 |
HIP 100223 |
21.14 |
| 2026-06-02 12:00 |
20:18:19.19 |
-46:45:43.0 |
HIP 100223 |
24.12 |
| 2026-06-03 00:00 |
20:18:11.53 |
-46:48:27.3 |
HIP 100223 |
27.12 |
| 2026-06-03 12:00 |
20:18:03.59 |
-46:51:11.6 |
HIP 100317 |
28.89 |
| 2026-06-04 00:00 |
20:17:55.36 |
-46:53:55.7 |
HIP 100317 |
29.41 |
| 2026-06-04 12:00 |
20:17:46.85 |
-46:56:39.8 |
HIP 100317 |
30.28 |
| 2026-06-05 00:00 |
20:17:38.05 |
-46:59:23.7 |
HIP 100317 |
31.47 |
| 2026-06-05 12:00 |
20:17:28.98 |
-47:02:07.5 |
HIP 100298 |
32.84 |
| 2026-06-06 00:00 |
20:17:19.62 |
-47:04:51.1 |
HIP 100298 |
33.60 |
| 2026-06-06 12:00 |
20:17:09.98 |
-47:07:34.5 |
HIP 100298 |
34.68 |
| 2026-06-07 00:00 |
20:17:00.05 |
-47:10:17.7 |
HIP 99744 |
32.49 |
| 2026-06-07 12:00 |
20:16:49.85 |
-47:13:00.6 |
HIP 99744 |
29.59 |
| 2026-06-08 00:00 |
20:16:39.36 |
-47:15:43.2 |
HIP 99744 |
26.73 |
| 2026-06-08 12:00 |
20:16:28.60 |
-47:18:25.6 |
HIP 99744 |
23.92 |
| 2026-06-09 00:00 |
20:16:17.55 |
-47:21:07.6 |
HIP 99744 |
21.21 |
| 2026-06-09 12:00 |
20:16:06.23 |
-47:23:49.2 |
HIP 99744 |
18.64 |
| 2026-06-10 00:00 |
20:15:54.62 |
-47:26:30.5 |
HIP 99744 |
16.29 |
| 2026-06-10 12:00 |
20:15:42.74 |
-47:29:11.4 |
HIP 99744 |
14.29 |
| 2026-06-11 00:00 |
20:15:30.59 |
-47:31:51.8 |
HIP 99744 |
12.83 |
| 2026-06-11 12:00 |
20:15:18.15 |
-47:34:31.8 |
HIP 99744 |
12.11 |
| 2026-06-12 00:00 |
20:15:05.45 |
-47:37:11.3 |
HIP 99744 |
12.28 |
| 2026-06-12 12:00 |
20:14:52.46 |
-47:39:50.4 |
HIP 99695 |
10.95 |
| 2026-06-13 00:00 |
20:14:39.21 |
-47:42:28.8 |
HIP 99695 |
10.01 |
| 2026-06-13 12:00 |
20:14:25.69 |
-47:45:06.7 |
HIP 99666 |
9.26 |
| 2026-06-14 00:00 |
20:14:11.89 |
-47:47:44.0 |
HIP 99666 |
8.28 |
| 2026-06-14 12:00 |
20:13:57.83 |
-47:50:20.7 |
HIP 99666 |
8.68 |
| 2026-06-15 00:00 |
20:13:43.50 |
-47:52:56.7 |
HIP 99666 |
10.33 |
| 2026-06-15 12:00 |
20:13:28.91 |
-47:55:32.1 |
HIP 99666 |
12.76 |
| 2026-06-16 00:00 |
20:13:14.05 |
-47:58:06.7 |
HIP 99666 |
15.63 |
| 2026-06-16 12:00 |
20:12:58.93 |
-48:00:40.6 |
HIP 99666 |
18.75 |
| 2026-06-17 00:00 |
20:12:43.55 |
-48:03:13.8 |
HIP 99637 |
17.51 |
| 2026-06-17 12:00 |
20:12:27.92 |
-48:05:46.1 |
HIP 99637 |
16.28 |
| 2026-06-18 00:00 |
20:12:12.03 |
-48:08:17.7 |
HIP 99637 |
15.84 |
| 2026-06-18 12:00 |
20:11:55.89 |
-48:10:48.4 |
HIP 99637 |
16.27 |
| 2026-06-19 00:00 |
20:11:39.50 |
-48:13:18.2 |
HIP 99637 |
17.53 |
| 2026-06-19 12:00 |
20:11:22.86 |
-48:15:47.1 |
HIP 99637 |
19.46 |
| 2026-06-20 00:00 |
20:11:05.98 |
-48:18:15.1 |
HIP 99637 |
21.89 |
| 2026-06-20 12:00 |
20:10:48.85 |
-48:20:42.1 |
HIP 99637 |
24.69 |
| 2026-06-21 00:00 |
20:10:31.48 |
-48:23:08.1 |
HIP 99637 |
27.75 |
| 2026-06-21 12:00 |
20:10:13.88 |
-48:25:33.2 |
HIP 99637 |
31.00 |
| 2026-06-22 00:00 |
20:09:56.03 |
-48:27:57.2 |
HIP 99275 |
28.78 |