| Parameter |
Value |
| Designation |
P/2019 A6 (Lemmon-PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-08-29T07:25:19.718400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:50Z |
| Obs used |
55 |
| NEO |
- |
| M1 |
17.900 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-07T12:20:51.936000Z |
| Discovery magnitude (MPC) |
20.70 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-01-05.0000000 |
| e |
0.63917742 |
| q (au) |
1.938506 |
| a (au) |
5.372463 |
| i (deg) |
33.228328 |
| Ω (om, deg) |
280.271890 |
| ω (w, deg) |
156.305004 |
| M (ma, deg) |
10.185707 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.765 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.765 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.558 |
| 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 |
17:52:17.86 |
-28:56:00.9 |
HIP 87419 |
10.37 |
| 2026-07-29 12:00 |
17:52:07.00 |
-28:55:18.0 |
HIP 87419 |
8.67 |
| 2026-07-30 00:00 |
17:51:56.24 |
-28:54:35.1 |
HIP 87419 |
7.42 |
| 2026-07-30 12:00 |
17:51:45.58 |
-28:53:52.0 |
HIP 87419 |
6.85 |
| 2026-07-31 00:00 |
17:51:35.04 |
-28:53:08.7 |
HIP 87419 |
7.11 |
| 2026-07-31 12:00 |
17:51:24.61 |
-28:52:25.4 |
HIP 87419 |
8.10 |
| 2026-08-01 00:00 |
17:51:14.28 |
-28:51:41.9 |
HIP 87419 |
9.58 |
| 2026-08-01 12:00 |
17:51:04.07 |
-28:50:58.3 |
HIP 87419 |
11.34 |
| 2026-08-02 00:00 |
17:50:53.97 |
-28:50:14.6 |
HIP 87419 |
13.26 |
| 2026-08-02 12:00 |
17:50:43.99 |
-28:49:30.7 |
HIP 87419 |
15.27 |
| 2026-08-03 00:00 |
17:50:34.11 |
-28:48:46.8 |
HIP 87419 |
17.33 |
| 2026-08-03 12:00 |
17:50:24.36 |
-28:48:02.8 |
HIP 87419 |
19.41 |
| 2026-08-04 00:00 |
17:50:14.72 |
-28:47:18.6 |
HIP 87419 |
21.51 |
| 2026-08-04 12:00 |
17:50:05.19 |
-28:46:34.4 |
HIP 87419 |
23.61 |
| 2026-08-05 00:00 |
17:49:55.79 |
-28:45:50.1 |
HIP 87419 |
25.70 |
| 2026-08-05 12:00 |
17:49:46.50 |
-28:45:05.7 |
HIP 87109 |
25.75 |
| 2026-08-06 00:00 |
17:49:37.33 |
-28:44:21.2 |
HIP 87109 |
23.61 |
| 2026-08-06 12:00 |
17:49:28.28 |
-28:43:36.6 |
HIP 87109 |
21.50 |
| 2026-08-07 00:00 |
17:49:19.35 |
-28:42:52.0 |
HIP 87109 |
19.41 |
| 2026-08-07 12:00 |
17:49:10.55 |
-28:42:07.2 |
HIP 87109 |
17.35 |
| 2026-08-08 00:00 |
17:49:01.87 |
-28:41:22.5 |
HIP 87109 |
15.32 |
| 2026-08-08 12:00 |
17:48:53.31 |
-28:40:37.6 |
HIP 87109 |
13.32 |
| 2026-08-09 00:00 |
17:48:44.88 |
-28:39:52.7 |
HIP 87109 |
11.35 |
| 2026-08-09 12:00 |
17:48:36.57 |
-28:39:07.7 |
HIP 87109 |
9.43 |
| 2026-08-10 00:00 |
17:48:28.39 |
-28:38:22.7 |
HIP 87109 |
7.55 |
| 2026-08-10 12:00 |
17:48:20.33 |
-28:37:37.6 |
HIP 87109 |
5.74 |
| 2026-08-11 00:00 |
17:48:12.40 |
-28:36:52.5 |
HIP 87109 |
4.06 |
| 2026-08-11 12:00 |
17:48:04.60 |
-28:36:07.3 |
HIP 87109 |
2.72 |
| 2026-08-12 00:00 |
17:47:56.93 |
-28:35:22.1 |
HIP 87109 |
2.31 |
| 2026-08-12 12:00 |
17:47:49.39 |
-28:34:36.9 |
HIP 87109 |
3.16 |
| 2026-08-13 00:00 |
17:47:41.98 |
-28:33:51.6 |
HIP 87109 |
4.60 |
| 2026-08-13 12:00 |
17:47:34.71 |
-28:33:06.3 |
HIP 87109 |
6.20 |
| 2026-08-14 00:00 |
17:47:27.56 |
-28:32:21.0 |
HIP 87109 |
7.86 |
| 2026-08-14 12:00 |
17:47:20.55 |
-28:31:35.6 |
HIP 87109 |
9.52 |
| 2026-08-15 00:00 |
17:47:13.66 |
-28:30:50.3 |
HIP 87109 |
11.17 |
| 2026-08-15 12:00 |
17:47:06.92 |
-28:30:04.9 |
HIP 87109 |
12.81 |
| 2026-08-16 00:00 |
17:47:00.30 |
-28:29:19.5 |
HIP 87109 |
14.44 |
| 2026-08-16 12:00 |
17:46:53.82 |
-28:28:34.1 |
HIP 87109 |
16.04 |
| 2026-08-17 00:00 |
17:46:47.48 |
-28:27:48.7 |
HIP 86919 |
15.78 |
| 2026-08-17 12:00 |
17:46:41.27 |
-28:27:03.3 |
HIP 86919 |
14.30 |
| 2026-08-18 00:00 |
17:46:35.19 |
-28:26:17.9 |
HIP 86919 |
12.86 |
| 2026-08-18 12:00 |
17:46:29.25 |
-28:25:32.5 |
HIP 86919 |
11.47 |
| 2026-08-19 00:00 |
17:46:23.45 |
-28:24:47.1 |
HIP 86919 |
10.15 |