| Parameter |
Value |
| Designation |
C/2019 Q3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-08-20T18:56:05.832960Z |
| Orbit solution date (soln_date, UTC) |
2021-05-02T23:42:43Z |
| Obs used |
85 |
| NEO |
- |
| M1 |
8.700 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-08-29T05:55:28.704000Z |
| Discovery magnitude (MPC) |
21.10 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-08-20.0000000 |
| e |
1.00470354 |
| q (au) |
7.250302 |
| a (au) |
-1541.455781 |
| i (deg) |
65.538248 |
| Ω (om, deg) |
151.325339 |
| ω (w, deg) |
152.625329 |
| M (ma, deg) |
0.005931 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.425 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.425 |
| n |
6.000 |
| gf |
0.933 |
| gb |
-0.739 |
| k |
0.805 |
| δ90 |
4.778 |
| 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) |
| 2026-06-01 00:00 |
03:25:39.40 |
-42:52:49.6 |
HIP 15973 |
6.36 |
| 2026-06-01 12:00 |
03:25:49.51 |
-42:53:03.8 |
HIP 15973 |
6.39 |
| 2026-06-02 00:00 |
03:25:59.59 |
-42:53:18.7 |
HIP 16027 |
5.18 |
| 2026-06-02 12:00 |
03:26:09.66 |
-42:53:34.3 |
HIP 16027 |
4.08 |
| 2026-06-03 00:00 |
03:26:19.71 |
-42:53:50.5 |
HIP 16027 |
3.68 |
| 2026-06-03 12:00 |
03:26:29.74 |
-42:54:07.4 |
HIP 16027 |
4.18 |
| 2026-06-04 00:00 |
03:26:39.75 |
-42:54:25.0 |
HIP 16027 |
5.32 |
| 2026-06-04 12:00 |
03:26:49.74 |
-42:54:43.2 |
HIP 16027 |
6.79 |
| 2026-06-05 00:00 |
03:26:59.71 |
-42:55:02.1 |
HIP 16027 |
8.42 |
| 2026-06-05 12:00 |
03:27:09.65 |
-42:55:21.6 |
HIP 16027 |
10.13 |
| 2026-06-06 00:00 |
03:27:19.57 |
-42:55:41.8 |
HIP 16027 |
11.88 |
| 2026-06-06 12:00 |
03:27:29.47 |
-42:56:02.7 |
HIP 16027 |
13.66 |
| 2026-06-07 00:00 |
03:27:39.35 |
-42:56:24.2 |
HIP 16027 |
15.45 |
| 2026-06-07 12:00 |
03:27:49.21 |
-42:56:46.3 |
HIP 16027 |
17.25 |
| 2026-06-08 00:00 |
03:27:59.04 |
-42:57:09.2 |
HIP 16027 |
19.07 |
| 2026-06-08 12:00 |
03:28:08.84 |
-42:57:32.6 |
HIP 16027 |
20.88 |
| 2026-06-09 00:00 |
03:28:18.62 |
-42:57:56.8 |
HIP 16027 |
22.70 |
| 2026-06-09 12:00 |
03:28:28.38 |
-42:58:21.6 |
HIP 16027 |
24.52 |
| 2026-06-10 00:00 |
03:28:38.11 |
-42:58:47.0 |
HIP 16285 |
25.09 |
| 2026-06-10 12:00 |
03:28:47.81 |
-42:59:13.1 |
HIP 16285 |
24.51 |
| 2026-06-11 00:00 |
03:28:57.49 |
-42:59:39.9 |
HIP 16285 |
24.06 |
| 2026-06-11 12:00 |
03:29:07.14 |
-43:00:07.3 |
HIP 16285 |
23.76 |
| 2026-06-12 00:00 |
03:29:16.76 |
-43:00:35.3 |
HIP 16285 |
23.61 |
| 2026-06-12 12:00 |
03:29:26.36 |
-43:01:04.0 |
HIP 16285 |
23.61 |
| 2026-06-13 00:00 |
03:29:35.92 |
-43:01:33.4 |
HIP 16285 |
23.77 |
| 2026-06-13 12:00 |
03:29:45.46 |
-43:02:03.4 |
HIP 16285 |
24.07 |
| 2026-06-14 00:00 |
03:29:54.97 |
-43:02:34.0 |
HIP 16285 |
24.51 |
| 2026-06-14 12:00 |
03:30:04.45 |
-43:03:05.3 |
HIP 16482 |
25.06 |
| 2026-06-15 00:00 |
03:30:13.89 |
-43:03:37.3 |
HIP 16482 |
23.61 |
| 2026-06-15 12:00 |
03:30:23.31 |
-43:04:09.8 |
HIP 16482 |
22.23 |
| 2026-06-16 00:00 |
03:30:32.69 |
-43:04:43.1 |
HIP 16482 |
20.92 |
| 2026-06-16 12:00 |
03:30:42.05 |
-43:05:16.9 |
HIP 16482 |
19.71 |
| 2026-06-17 00:00 |
03:30:51.37 |
-43:05:51.4 |
HIP 16482 |
18.59 |
| 2026-06-17 12:00 |
03:31:00.65 |
-43:06:26.5 |
HIP 16482 |
17.61 |
| 2026-06-18 00:00 |
03:31:09.91 |
-43:07:02.3 |
HIP 16482 |
16.77 |
| 2026-06-18 12:00 |
03:31:19.13 |
-43:07:38.7 |
HIP 16482 |
16.10 |
| 2026-06-19 00:00 |
03:31:28.31 |
-43:08:15.7 |
HIP 16482 |
15.62 |
| 2026-06-19 12:00 |
03:31:37.46 |
-43:08:53.3 |
HIP 16482 |
15.35 |
| 2026-06-20 00:00 |
03:31:46.58 |
-43:09:31.6 |
HIP 16482 |
15.29 |
| 2026-06-20 12:00 |
03:31:55.66 |
-43:10:10.5 |
HIP 16482 |
15.46 |
| 2026-06-21 00:00 |
03:32:04.70 |
-43:10:50.0 |
HIP 16482 |
15.83 |
| 2026-06-21 12:00 |
03:32:13.71 |
-43:11:30.1 |
HIP 16482 |
16.41 |
| 2026-06-22 00:00 |
03:32:22.68 |
-43:12:10.8 |
HIP 16619 |
16.22 |