| 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) |
| 2026-03-26 00:00 |
19:56:00.40 |
-41:57:50.7 |
HIP 98032 |
10.11 |
| 2026-03-26 12:00 |
19:56:23.99 |
-41:59:02.3 |
HIP 98122 |
10.69 |
| 2026-03-27 00:00 |
19:56:47.43 |
-42:00:14.7 |
HIP 98122 |
9.84 |
| 2026-03-27 12:00 |
19:57:10.71 |
-42:01:27.8 |
HIP 98122 |
10.93 |
| 2026-03-28 00:00 |
19:57:33.85 |
-42:02:41.7 |
HIP 98122 |
13.48 |
| 2026-03-28 12:00 |
19:57:56.83 |
-42:03:56.4 |
HIP 98334 |
15.55 |
| 2026-03-29 00:00 |
19:58:19.65 |
-42:05:11.9 |
HIP 98334 |
14.88 |
| 2026-03-29 12:00 |
19:58:42.32 |
-42:06:28.2 |
HIP 98334 |
15.51 |
| 2026-03-30 00:00 |
19:59:04.84 |
-42:07:45.3 |
HIP 98334 |
17.29 |
| 2026-03-30 12:00 |
19:59:27.20 |
-42:09:03.1 |
HIP 98539 |
18.11 |
| 2026-03-31 00:00 |
19:59:49.39 |
-42:10:21.8 |
HIP 98539 |
13.96 |
| 2026-03-31 12:00 |
20:00:11.43 |
-42:11:41.3 |
HIP 98539 |
9.99 |
| 2026-04-01 00:00 |
20:00:33.31 |
-42:13:01.5 |
HIP 98539 |
6.47 |
| 2026-04-01 12:00 |
20:00:55.03 |
-42:14:22.6 |
HIP 98539 |
4.56 |
| 2026-04-02 00:00 |
20:01:16.59 |
-42:15:44.5 |
HIP 98539 |
5.97 |
| 2026-04-02 12:00 |
20:01:37.98 |
-42:17:07.3 |
HIP 98539 |
9.27 |
| 2026-04-03 00:00 |
20:01:59.20 |
-42:18:30.8 |
HIP 98539 |
13.07 |
| 2026-04-03 12:00 |
20:02:20.26 |
-42:19:55.2 |
HIP 98539 |
17.03 |
| 2026-04-04 00:00 |
20:02:41.16 |
-42:21:20.4 |
HIP 98539 |
21.04 |
| 2026-04-04 12:00 |
20:03:01.88 |
-42:22:46.5 |
HIP 98539 |
25.06 |
| 2026-04-05 00:00 |
20:03:22.44 |
-42:24:13.4 |
HIP 98972 |
26.46 |
| 2026-04-05 12:00 |
20:03:42.82 |
-42:25:41.1 |
HIP 98972 |
23.53 |
| 2026-04-06 00:00 |
20:04:03.03 |
-42:27:09.7 |
HIP 98972 |
21.02 |
| 2026-04-06 12:00 |
20:04:23.07 |
-42:28:39.2 |
HIP 98972 |
19.06 |
| 2026-04-07 00:00 |
20:04:42.94 |
-42:30:09.4 |
HIP 98972 |
17.82 |
| 2026-04-07 12:00 |
20:05:02.63 |
-42:31:40.6 |
HIP 98972 |
17.45 |
| 2026-04-08 00:00 |
20:05:22.14 |
-42:33:12.6 |
HIP 98972 |
17.97 |
| 2026-04-08 12:00 |
20:05:41.47 |
-42:34:45.5 |
HIP 98972 |
19.31 |
| 2026-04-09 00:00 |
20:06:00.63 |
-42:36:19.2 |
HIP 98972 |
21.29 |
| 2026-04-09 12:00 |
20:06:19.60 |
-42:37:53.8 |
HIP 98972 |
23.74 |
| 2026-04-10 00:00 |
20:06:38.39 |
-42:39:29.3 |
HIP 98972 |
26.52 |
| 2026-04-10 12:00 |
20:06:57.00 |
-42:41:05.7 |
HIP 98972 |
29.53 |
| 2026-04-11 00:00 |
20:07:15.42 |
-42:42:42.9 |
HIP 99329 |
29.45 |
| 2026-04-11 12:00 |
20:07:33.65 |
-42:44:21.0 |
HIP 99329 |
27.28 |
| 2026-04-12 00:00 |
20:07:51.70 |
-42:46:00.0 |
HIP 99329 |
25.51 |
| 2026-04-12 12:00 |
20:08:09.56 |
-42:47:39.9 |
HIP 99329 |
24.22 |
| 2026-04-13 00:00 |
20:08:27.23 |
-42:49:20.7 |
HIP 99329 |
23.47 |
| 2026-04-13 12:00 |
20:08:44.70 |
-42:51:02.4 |
HIP 99329 |
23.31 |
| 2026-04-14 00:00 |
20:09:01.99 |
-42:52:44.9 |
HIP 99329 |
23.74 |
| 2026-04-14 12:00 |
20:09:19.07 |
-42:54:28.4 |
HIP 99329 |
24.72 |
| 2026-04-15 00:00 |
20:09:35.97 |
-42:56:12.7 |
HIP 99329 |
26.17 |
| 2026-04-15 12:00 |
20:09:52.66 |
-42:57:57.9 |
HIP 99329 |
28.01 |
| 2026-04-16 00:00 |
20:10:09.16 |
-42:59:44.1 |
HIP 99570 |
27.86 |