| 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) |
| 2026-09-25 00:00 |
11:42:42.49 |
+10:58:10.4 |
HIP 57163 |
10.33 |
| 2026-09-25 12:00 |
11:43:13.13 |
+10:54:29.8 |
HIP 57163 |
5.38 |
| 2026-09-26 00:00 |
11:43:43.76 |
+10:50:49.5 |
HIP 57183 |
9.39 |
| 2026-09-26 12:00 |
11:44:14.37 |
+10:47:09.5 |
HIP 57219 |
6.99 |
| 2026-09-27 00:00 |
11:44:44.96 |
+10:43:29.9 |
HIP 57219 |
11.33 |
| 2026-09-27 12:00 |
11:45:15.52 |
+10:39:50.5 |
HIP 57219 |
18.64 |
| 2026-09-28 00:00 |
11:45:46.07 |
+10:36:11.5 |
HIP 57516 |
24.70 |
| 2026-09-28 12:00 |
11:46:16.60 |
+10:32:32.8 |
HIP 57516 |
16.42 |
| 2026-09-29 00:00 |
11:46:47.10 |
+10:28:54.4 |
HIP 57516 |
8.24 |
| 2026-09-29 12:00 |
11:47:17.59 |
+10:25:16.4 |
HIP 57516 |
2.25 |
| 2026-09-30 00:00 |
11:47:48.05 |
+10:21:38.7 |
HIP 57516 |
9.00 |
| 2026-09-30 12:00 |
11:48:18.49 |
+10:18:01.3 |
HIP 57516 |
17.18 |
| 2026-10-01 00:00 |
11:48:48.90 |
+10:14:24.3 |
HIP 57734 |
24.93 |
| 2026-10-01 12:00 |
11:49:19.30 |
+10:10:47.6 |
HIP 57734 |
16.62 |
| 2026-10-02 00:00 |
11:49:49.67 |
+10:07:11.3 |
HIP 57734 |
8.33 |
| 2026-10-02 12:00 |
11:50:20.01 |
+10:03:35.3 |
HIP 57734 |
0.52 |
| 2026-10-03 00:00 |
11:50:50.33 |
+09:59:59.7 |
HIP 57734 |
8.27 |
| 2026-10-03 12:00 |
11:51:20.63 |
+09:56:24.4 |
HIP 57852 |
7.96 |
| 2026-10-04 00:00 |
11:51:50.90 |
+09:52:49.5 |
HIP 57852 |
5.83 |
| 2026-10-04 12:00 |
11:52:21.15 |
+09:49:15.0 |
HIP 57888 |
7.62 |
| 2026-10-05 00:00 |
11:52:51.36 |
+09:45:40.8 |
HIP 57888 |
13.45 |
| 2026-10-05 12:00 |
11:53:21.55 |
+09:42:07.1 |
HIP 58035 |
16.20 |
| 2026-10-06 00:00 |
11:53:51.72 |
+09:38:33.7 |
HIP 58035 |
15.55 |
| 2026-10-06 12:00 |
11:54:21.85 |
+09:35:00.7 |
HIP 58035 |
18.89 |
| 2026-10-07 00:00 |
11:54:51.96 |
+09:31:28.2 |
HIP 58035 |
24.63 |
| 2026-10-07 12:00 |
11:55:22.03 |
+09:27:56.0 |
HIP 58139 |
20.22 |
| 2026-10-08 00:00 |
11:55:52.08 |
+09:24:24.2 |
HIP 58139 |
17.74 |
| 2026-10-08 12:00 |
11:56:22.09 |
+09:20:52.9 |
HIP 58139 |
18.86 |
| 2026-10-09 00:00 |
11:56:52.07 |
+09:17:22.0 |
HIP 58337 |
22.77 |
| 2026-10-09 12:00 |
11:57:22.02 |
+09:13:51.5 |
HIP 58337 |
15.90 |
| 2026-10-10 00:00 |
11:57:51.94 |
+09:10:21.4 |
HIP 58337 |
11.01 |
| 2026-10-10 12:00 |
11:58:21.82 |
+09:06:51.8 |
HIP 58337 |
11.10 |
| 2026-10-11 00:00 |
11:58:51.67 |
+09:03:22.6 |
HIP 58337 |
16.07 |
| 2026-10-11 12:00 |
11:59:21.49 |
+08:59:53.8 |
HIP 58337 |
22.93 |
| 2026-10-12 00:00 |
11:59:51.27 |
+08:56:25.6 |
HIP 58607 |
20.26 |
| 2026-10-12 12:00 |
12:00:21.01 |
+08:52:57.7 |
HIP 58607 |
12.14 |
| 2026-10-13 00:00 |
12:00:50.72 |
+08:49:30.4 |
HIP 58607 |
4.04 |
| 2026-10-13 12:00 |
12:01:20.38 |
+08:46:03.5 |
HIP 58607 |
4.09 |
| 2026-10-14 00:00 |
12:01:50.01 |
+08:42:37.1 |
HIP 58607 |
12.17 |
| 2026-10-14 12:00 |
12:02:19.61 |
+08:39:11.1 |
HIP 58607 |
20.25 |
| 2026-10-15 00:00 |
12:02:49.16 |
+08:35:45.7 |
HIP 58682 |
27.33 |
| 2026-10-15 12:00 |
12:03:18.67 |
+08:32:20.7 |
HIP 58715 |
30.15 |
| 2026-10-16 00:00 |
12:03:48.14 |
+08:28:56.2 |
HIP 58948 |
25.74 |