P/2019 W1 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
19:05:51.28 |
-40:48:47.8 |
HIP 93848 |
20.33 |
| 2026-02-03 12:00 |
19:06:24.93 |
-40:49:06.8 |
HIP 93912 |
16.87 |
| 2026-02-04 00:00 |
19:06:58.52 |
-40:49:26.1 |
HIP 93912 |
14.08 |
| 2026-02-04 12:00 |
19:07:32.06 |
-40:49:45.6 |
HIP 93912 |
13.90 |
| 2026-02-05 00:00 |
19:08:05.55 |
-40:50:05.4 |
HIP 93912 |
16.41 |
| 2026-02-05 12:00 |
19:08:38.98 |
-40:50:25.5 |
HIP 93912 |
20.63 |
| 2026-02-06 00:00 |
19:09:12.36 |
-40:50:45.8 |
HIP 94159 |
21.01 |
| 2026-02-06 12:00 |
19:09:45.68 |
-40:51:06.5 |
HIP 94159 |
19.44 |
| 2026-02-07 00:00 |
19:10:18.95 |
-40:51:27.4 |
HIP 94159 |
19.87 |
| 2026-02-07 12:00 |
19:10:52.16 |
-40:51:48.7 |
HIP 94159 |
22.16 |
| 2026-02-08 00:00 |
19:11:25.31 |
-40:52:10.2 |
HIP 94420 |
19.47 |
| 2026-02-08 12:00 |
19:11:58.40 |
-40:52:32.1 |
HIP 94420 |
13.67 |
| 2026-02-09 00:00 |
19:12:31.43 |
-40:52:54.2 |
HIP 94420 |
8.59 |
| 2026-02-09 12:00 |
19:13:04.40 |
-40:53:16.7 |
HIP 94420 |
6.24 |
| 2026-02-10 00:00 |
19:13:37.31 |
-40:53:39.5 |
HIP 94420 |
9.06 |
| 2026-02-10 12:00 |
19:14:10.16 |
-40:54:02.7 |
HIP 94420 |
14.24 |
| 2026-02-11 00:00 |
19:14:42.94 |
-40:54:26.1 |
HIP 94668 |
17.51 |
| 2026-02-11 12:00 |
19:15:15.66 |
-40:54:49.9 |
HIP 94668 |
13.40 |
| 2026-02-12 00:00 |
19:15:48.32 |
-40:55:14.1 |
HIP 94668 |
11.35 |
| 2026-02-12 12:00 |
19:16:20.90 |
-40:55:38.6 |
HIP 94668 |
12.42 |
| 2026-02-13 00:00 |
19:16:53.42 |
-40:56:03.4 |
HIP 94668 |
15.97 |
| 2026-02-13 12:00 |
19:17:25.87 |
-40:56:28.6 |
HIP 94668 |
20.75 |
| 2026-02-14 00:00 |
19:17:58.26 |
-40:56:54.2 |
HIP 94893 |
18.51 |
| 2026-02-14 12:00 |
19:18:30.57 |
-40:57:20.1 |
HIP 94980 |
15.41 |
| 2026-02-15 00:00 |
19:19:02.81 |
-40:57:46.4 |
HIP 94980 |
11.17 |
| 2026-02-15 12:00 |
19:19:34.97 |
-40:58:13.1 |
HIP 94980 |
9.31 |
| 2026-02-16 00:00 |
19:20:07.07 |
-40:58:40.1 |
HIP 94980 |
11.08 |
| 2026-02-16 12:00 |
19:20:39.09 |
-40:59:07.5 |
HIP 94980 |
15.26 |
| 2026-02-17 00:00 |
19:21:11.03 |
-40:59:35.4 |
HIP 95220 |
13.46 |
| 2026-02-17 12:00 |
19:21:42.90 |
-41:00:03.6 |
HIP 95220 |
7.49 |
| 2026-02-18 00:00 |
19:22:14.68 |
-41:00:32.2 |
HIP 95220 |
1.90 |
| 2026-02-18 12:00 |
19:22:46.40 |
-41:01:01.3 |
HIP 95220 |
4.84 |
| 2026-02-19 00:00 |
19:23:18.03 |
-41:01:30.7 |
HIP 95286 |
7.13 |
| 2026-02-19 12:00 |
19:23:49.58 |
-41:02:00.6 |
HIP 95286 |
10.15 |
| 2026-02-20 00:00 |
19:24:21.05 |
-41:02:30.9 |
HIP 95286 |
15.02 |
| 2026-02-20 12:00 |
19:24:52.43 |
-41:03:01.6 |
HIP 95286 |
20.46 |
| 2026-02-21 00:00 |
19:25:23.74 |
-41:03:32.7 |
HIP 95648 |
23.54 |
| 2026-02-21 12:00 |
19:25:54.96 |
-41:04:04.3 |
HIP 95648 |
18.26 |
| 2026-02-22 00:00 |
19:26:26.09 |
-41:04:36.3 |
HIP 95648 |
13.54 |
| 2026-02-22 12:00 |
19:26:57.14 |
-41:05:08.7 |
HIP 95648 |
10.14 |
| 2026-02-23 00:00 |
19:27:28.10 |
-41:05:41.6 |
HIP 95648 |
9.58 |
| 2026-02-23 12:00 |
19:27:58.97 |
-41:06:15.0 |
HIP 95648 |
12.23 |
| 2026-02-24 00:00 |
19:28:29.75 |
-41:06:48.8 |
HIP 95648 |
16.59 |