| Parameter |
Value |
| Designation |
P/2019 A1 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-10-11T01:01:39.613440Z |
| Orbit solution date (soln_date, UTC) |
2021-05-31T22:43:01Z |
| Obs used |
63 |
| NEO |
- |
| M1 |
17.300 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-03T15:02:41.568000Z |
| Discovery magnitude (MPC) |
20.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-01-18.0000000 |
| e |
0.56892834 |
| q (au) |
2.211667 |
| a (au) |
5.130625 |
| i (deg) |
13.743622 |
| Ω (om, deg) |
312.299496 |
| ω (w, deg) |
150.846750 |
| M (ma, deg) |
8.392589 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.446 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.446 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.718 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
20:32:43.07 |
-20:49:33.7 |
HIP 101437 |
10.90 |
| 2026-07-29 12:00 |
20:32:28.40 |
-20:50:08.4 |
HIP 101437 |
13.96 |
| 2026-07-30 00:00 |
20:32:13.73 |
-20:50:42.9 |
HIP 101437 |
17.17 |
| 2026-07-30 12:00 |
20:31:59.06 |
-20:51:17.3 |
HIP 101192 |
20.21 |
| 2026-07-31 00:00 |
20:31:44.39 |
-20:51:51.5 |
HIP 101192 |
17.47 |
| 2026-07-31 12:00 |
20:31:29.71 |
-20:52:25.6 |
HIP 101192 |
15.05 |
| 2026-08-01 00:00 |
20:31:15.04 |
-20:52:59.4 |
HIP 101192 |
13.10 |
| 2026-08-01 12:00 |
20:31:00.37 |
-20:53:33.1 |
HIP 101192 |
11.87 |
| 2026-08-02 00:00 |
20:30:45.71 |
-20:54:06.6 |
HIP 101192 |
11.58 |
| 2026-08-02 12:00 |
20:30:31.06 |
-20:54:39.9 |
HIP 101192 |
12.31 |
| 2026-08-03 00:00 |
20:30:16.41 |
-20:55:13.0 |
HIP 101192 |
13.89 |
| 2026-08-03 12:00 |
20:30:01.78 |
-20:55:45.9 |
HIP 101098 |
13.17 |
| 2026-08-04 00:00 |
20:29:47.16 |
-20:56:18.5 |
HIP 101039 |
11.16 |
| 2026-08-04 12:00 |
20:29:32.55 |
-20:56:51.0 |
HIP 101039 |
8.01 |
| 2026-08-05 00:00 |
20:29:17.96 |
-20:57:23.3 |
HIP 101039 |
5.27 |
| 2026-08-05 12:00 |
20:29:03.39 |
-20:57:55.3 |
HIP 101039 |
3.90 |
| 2026-08-06 00:00 |
20:28:48.84 |
-20:58:27.1 |
HIP 101039 |
5.12 |
| 2026-08-06 12:00 |
20:28:34.32 |
-20:58:58.6 |
HIP 101039 |
7.80 |
| 2026-08-07 00:00 |
20:28:19.81 |
-20:59:29.9 |
HIP 101039 |
10.90 |
| 2026-08-07 12:00 |
20:28:05.34 |
-21:00:01.0 |
HIP 101039 |
14.14 |
| 2026-08-08 00:00 |
20:27:50.89 |
-21:00:31.8 |
HIP 101039 |
17.45 |
| 2026-08-08 12:00 |
20:27:36.47 |
-21:01:02.4 |
HIP 101039 |
20.78 |
| 2026-08-09 00:00 |
20:27:22.09 |
-21:01:32.7 |
HIP 101039 |
24.12 |
| 2026-08-09 12:00 |
20:27:07.73 |
-21:02:02.7 |
HIP 100740 |
24.46 |
| 2026-08-10 00:00 |
20:26:53.42 |
-21:02:32.5 |
HIP 100740 |
21.14 |
| 2026-08-10 12:00 |
20:26:39.14 |
-21:03:02.0 |
HIP 100740 |
17.84 |
| 2026-08-11 00:00 |
20:26:24.90 |
-21:03:31.2 |
HIP 100740 |
14.58 |
| 2026-08-11 12:00 |
20:26:10.70 |
-21:04:00.1 |
HIP 100740 |
11.40 |
| 2026-08-12 00:00 |
20:25:56.55 |
-21:04:28.7 |
HIP 100740 |
8.35 |
| 2026-08-12 12:00 |
20:25:42.44 |
-21:04:57.0 |
HIP 100740 |
5.65 |
| 2026-08-13 00:00 |
20:25:28.38 |
-21:05:25.0 |
HIP 100740 |
4.03 |
| 2026-08-13 12:00 |
20:25:14.37 |
-21:05:52.7 |
HIP 100740 |
4.74 |
| 2026-08-14 00:00 |
20:25:00.41 |
-21:06:20.1 |
HIP 100740 |
7.09 |
| 2026-08-14 12:00 |
20:24:46.51 |
-21:06:47.1 |
HIP 100740 |
9.98 |
| 2026-08-15 00:00 |
20:24:32.66 |
-21:07:13.8 |
HIP 100608 |
7.00 |
| 2026-08-15 12:00 |
20:24:18.87 |
-21:07:40.3 |
HIP 100608 |
4.05 |
| 2026-08-16 00:00 |
20:24:05.13 |
-21:08:06.3 |
HIP 100608 |
2.19 |
| 2026-08-16 12:00 |
20:23:51.46 |
-21:08:32.1 |
HIP 100608 |
3.75 |
| 2026-08-17 00:00 |
20:23:37.85 |
-21:08:57.5 |
HIP 100608 |
6.62 |
| 2026-08-17 12:00 |
20:23:24.30 |
-21:09:22.5 |
HIP 100608 |
9.68 |
| 2026-08-18 00:00 |
20:23:10.82 |
-21:09:47.2 |
HIP 100608 |
12.79 |
| 2026-08-18 12:00 |
20:22:57.41 |
-21:10:11.5 |
HIP 100568 |
14.84 |
| 2026-08-19 00:00 |
20:22:44.07 |
-21:10:35.5 |
HIP 100568 |
16.60 |