| Parameter |
Value |
| Designation |
P/2019 A3 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-08-01T21:04:24.133440Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:13:36Z |
| Obs used |
66 |
| NEO |
- |
| M1 |
19.100 |
| K1 |
5.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-03T06:27:04.320000Z |
| Discovery magnitude (MPC) |
21.90 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-01-04.0000000 |
| e |
0.26518544 |
| q (au) |
2.312949 |
| a (au) |
3.147663 |
| i (deg) |
15.365067 |
| Ω (om, deg) |
31.323079 |
| ω (w, deg) |
325.480485 |
| M (ma, deg) |
91.796650 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.507 + 5.147\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.507 |
| n |
5.147 |
| gf |
0.999 |
| gb |
-0.907 |
| k |
0.996 |
| δ90 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
10:43:22.14 |
+18:23:25.6 |
HIP 52415 |
7.01 |
| 2026-07-29 12:00 |
10:43:51.81 |
+18:19:33.1 |
HIP 52484 |
1.00 |
| 2026-07-30 00:00 |
10:44:21.51 |
+18:15:40.4 |
HIP 52484 |
8.30 |
| 2026-07-30 12:00 |
10:44:51.25 |
+18:11:47.7 |
HIP 52484 |
16.33 |
| 2026-07-31 00:00 |
10:45:21.02 |
+18:07:55.0 |
HIP 52484 |
24.39 |
| 2026-07-31 12:00 |
10:45:50.83 |
+18:04:02.2 |
HIP 52533 |
32.17 |
| 2026-08-01 00:00 |
10:46:20.67 |
+18:00:09.3 |
HIP 52533 |
34.48 |
| 2026-08-01 12:00 |
10:46:50.55 |
+17:56:16.4 |
HIP 52533 |
38.40 |
| 2026-08-02 00:00 |
10:47:20.47 |
+17:52:23.4 |
HIP 52533 |
43.51 |
| 2026-08-02 12:00 |
10:47:50.42 |
+17:48:30.4 |
HIP 52926 |
45.89 |
| 2026-08-03 00:00 |
10:48:20.40 |
+17:44:37.3 |
HIP 52926 |
39.18 |
| 2026-08-03 12:00 |
10:48:50.41 |
+17:40:44.2 |
HIP 52926 |
33.11 |
| 2026-08-04 00:00 |
10:49:20.46 |
+17:36:51.0 |
HIP 52926 |
28.10 |
| 2026-08-04 12:00 |
10:49:50.53 |
+17:32:57.8 |
HIP 52926 |
24.83 |
| 2026-08-05 00:00 |
10:50:20.64 |
+17:29:04.5 |
HIP 52926 |
24.01 |
| 2026-08-05 12:00 |
10:50:50.78 |
+17:25:11.2 |
HIP 52926 |
25.90 |
| 2026-08-06 00:00 |
10:51:20.95 |
+17:21:17.8 |
HIP 52926 |
29.99 |
| 2026-08-06 12:00 |
10:51:51.15 |
+17:17:24.4 |
HIP 53225 |
27.25 |
| 2026-08-07 00:00 |
10:52:21.38 |
+17:13:31.0 |
HIP 53225 |
19.47 |
| 2026-08-07 12:00 |
10:52:51.64 |
+17:09:37.5 |
HIP 53225 |
12.25 |
| 2026-08-08 00:00 |
10:53:21.93 |
+17:05:44.0 |
HIP 53225 |
7.48 |
| 2026-08-08 12:00 |
10:53:52.24 |
+17:01:50.5 |
HIP 53291 |
4.69 |
| 2026-08-09 00:00 |
10:54:22.59 |
+16:57:56.9 |
HIP 53291 |
10.44 |
| 2026-08-09 12:00 |
10:54:52.96 |
+16:54:03.4 |
HIP 53291 |
18.22 |
| 2026-08-10 00:00 |
10:55:23.35 |
+16:50:09.8 |
HIP 53291 |
26.28 |
| 2026-08-10 12:00 |
10:55:53.77 |
+16:46:16.2 |
HIP 53291 |
34.44 |
| 2026-08-11 00:00 |
10:56:24.22 |
+16:42:22.6 |
HIP 53635 |
28.80 |
| 2026-08-11 12:00 |
10:56:54.69 |
+16:38:29.0 |
HIP 53635 |
20.97 |
| 2026-08-12 00:00 |
10:57:25.19 |
+16:34:35.4 |
HIP 53635 |
13.65 |
| 2026-08-12 12:00 |
10:57:55.71 |
+16:30:41.8 |
HIP 53635 |
8.35 |
| 2026-08-13 00:00 |
10:58:26.25 |
+16:26:48.2 |
HIP 53635 |
9.51 |
| 2026-08-13 12:00 |
10:58:56.81 |
+16:22:54.6 |
HIP 53746 |
12.35 |
| 2026-08-14 00:00 |
10:59:27.39 |
+16:19:01.0 |
HIP 53746 |
6.55 |
| 2026-08-14 12:00 |
10:59:58.00 |
+16:15:07.4 |
HIP 53746 |
8.44 |
| 2026-08-15 00:00 |
11:00:28.63 |
+16:11:13.9 |
HIP 53746 |
15.43 |
| 2026-08-15 12:00 |
11:00:59.27 |
+16:07:20.4 |
HIP 53746 |
23.31 |
| 2026-08-16 00:00 |
11:01:29.93 |
+16:03:26.9 |
HIP 53947 |
29.49 |
| 2026-08-16 12:00 |
11:02:00.61 |
+15:59:33.4 |
HIP 53953 |
31.29 |
| 2026-08-17 00:00 |
11:02:31.31 |
+15:55:40.0 |
HIP 54089 |
29.94 |
| 2026-08-17 12:00 |
11:03:02.03 |
+15:51:46.6 |
HIP 54089 |
28.06 |
| 2026-08-18 00:00 |
11:03:32.76 |
+15:47:53.3 |
HIP 54089 |
28.59 |
| 2026-08-18 12:00 |
11:04:03.51 |
+15:44:00.0 |
HIP 54089 |
31.40 |
| 2026-08-19 00:00 |
11:04:34.28 |
+15:40:06.8 |
HIP 54089 |
35.98 |