| 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
$$
M_a = (7.421 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.421 |
| n |
6.000 |
| gf |
0.932 |
| gb |
-0.739 |
| k |
0.805 |
| δ90 |
4.736 |
| 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) |
| 2026-05-12 00:00 |
03:18:44.66 |
-42:52:28.8 |
HIP 15407 |
13.99 |
| 2026-05-12 12:00 |
03:18:55.15 |
-42:52:16.2 |
HIP 15407 |
14.06 |
| 2026-05-13 00:00 |
03:19:05.65 |
-42:52:04.2 |
HIP 15407 |
14.41 |
| 2026-05-13 12:00 |
03:19:16.15 |
-42:51:53.0 |
HIP 15510 |
14.14 |
| 2026-05-14 00:00 |
03:19:26.64 |
-42:51:42.4 |
HIP 15510 |
13.49 |
| 2026-05-14 12:00 |
03:19:37.13 |
-42:51:32.5 |
HIP 15510 |
13.09 |
| 2026-05-15 00:00 |
03:19:47.62 |
-42:51:23.3 |
HIP 15510 |
12.95 |
| 2026-05-15 12:00 |
03:19:58.11 |
-42:51:14.7 |
HIP 15510 |
13.08 |
| 2026-05-16 00:00 |
03:20:08.60 |
-42:51:06.8 |
HIP 15510 |
13.48 |
| 2026-05-16 12:00 |
03:20:19.08 |
-42:50:59.6 |
HIP 15510 |
14.12 |
| 2026-05-17 00:00 |
03:20:29.55 |
-42:50:53.0 |
HIP 15510 |
14.97 |
| 2026-05-17 12:00 |
03:20:40.02 |
-42:50:47.1 |
HIP 15510 |
15.99 |
| 2026-05-18 00:00 |
03:20:50.49 |
-42:50:41.9 |
HIP 15510 |
17.16 |
| 2026-05-18 12:00 |
03:21:00.95 |
-42:50:37.4 |
HIP 15510 |
18.45 |
| 2026-05-19 00:00 |
03:21:11.40 |
-42:50:33.6 |
HIP 15510 |
19.83 |
| 2026-05-19 12:00 |
03:21:21.85 |
-42:50:30.4 |
HIP 15510 |
21.28 |
| 2026-05-20 00:00 |
03:21:32.29 |
-42:50:27.9 |
HIP 15510 |
22.80 |
| 2026-05-20 12:00 |
03:21:42.72 |
-42:50:26.1 |
HIP 15510 |
24.36 |
| 2026-05-21 00:00 |
03:21:53.14 |
-42:50:24.9 |
HIP 15510 |
25.96 |
| 2026-05-21 12:00 |
03:22:03.56 |
-42:50:24.5 |
HIP 15510 |
27.59 |
| 2026-05-22 00:00 |
03:22:13.96 |
-42:50:24.7 |
HIP 15510 |
29.25 |
| 2026-05-22 12:00 |
03:22:24.35 |
-42:50:25.6 |
HIP 15739 |
30.38 |
| 2026-05-23 00:00 |
03:22:34.74 |
-42:50:27.1 |
HIP 15739 |
30.15 |
| 2026-05-23 12:00 |
03:22:45.11 |
-42:50:29.3 |
HIP 15739 |
30.03 |
| 2026-05-24 00:00 |
03:22:55.47 |
-42:50:32.2 |
HIP 15739 |
30.02 |
| 2026-05-24 12:00 |
03:23:05.83 |
-42:50:35.8 |
HIP 15973 |
29.41 |
| 2026-05-25 00:00 |
03:23:16.16 |
-42:50:40.0 |
HIP 15973 |
27.58 |
| 2026-05-25 12:00 |
03:23:26.49 |
-42:50:45.0 |
HIP 15973 |
25.76 |
| 2026-05-26 00:00 |
03:23:36.80 |
-42:50:50.5 |
HIP 15973 |
23.95 |
| 2026-05-26 12:00 |
03:23:47.10 |
-42:50:56.8 |
HIP 15973 |
22.15 |
| 2026-05-27 00:00 |
03:23:57.39 |
-42:51:03.7 |
HIP 15973 |
20.37 |
| 2026-05-27 12:00 |
03:24:07.66 |
-42:51:11.3 |
HIP 15973 |
18.61 |
| 2026-05-28 00:00 |
03:24:17.92 |
-42:51:19.5 |
HIP 15973 |
16.87 |
| 2026-05-28 12:00 |
03:24:28.16 |
-42:51:28.5 |
HIP 15973 |
15.16 |
| 2026-05-29 00:00 |
03:24:38.39 |
-42:51:38.1 |
HIP 15973 |
13.49 |
| 2026-05-29 12:00 |
03:24:48.60 |
-42:51:48.3 |
HIP 15973 |
11.88 |
| 2026-05-30 00:00 |
03:24:58.79 |
-42:51:59.2 |
HIP 15973 |
10.35 |
| 2026-05-30 12:00 |
03:25:08.97 |
-42:52:10.8 |
HIP 15973 |
8.95 |
| 2026-05-31 00:00 |
03:25:19.13 |
-42:52:23.1 |
HIP 15973 |
7.75 |
| 2026-05-31 12:00 |
03:25:29.27 |
-42:52:36.0 |
HIP 15973 |
6.84 |
| 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 |