| Parameter |
Value |
| Designation |
C/2019 A5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-06-09T10:42:31.567680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:51Z |
| Obs used |
70 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
12.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-01-13T11:48:30.528000Z |
| Discovery magnitude (MPC) |
21.50 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-08-06.0000000 |
| e |
0.70787404 |
| q (au) |
6.324147 |
| a (au) |
21.648700 |
| i (deg) |
67.539002 |
| Ω (om, deg) |
146.619252 |
| ω (w, deg) |
356.039843 |
| M (ma, deg) |
0.563158 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.399 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.399 |
| n |
6.000 |
| gf |
0.988 |
| gb |
-0.862 |
| 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) |
| 2026-06-01 00:00 |
18:11:26.19 |
+43:23:54.3 |
HIP 89317 |
22.73 |
| 2026-06-01 12:00 |
18:11:17.61 |
+43:24:20.9 |
HIP 89317 |
24.34 |
| 2026-06-02 00:00 |
18:11:08.99 |
+43:24:46.6 |
HIP 89317 |
25.96 |
| 2026-06-02 12:00 |
18:11:00.34 |
+43:25:11.3 |
HIP 88882 |
25.98 |
| 2026-06-03 00:00 |
18:10:51.65 |
+43:25:35.0 |
HIP 88882 |
24.59 |
| 2026-06-03 12:00 |
18:10:42.92 |
+43:25:57.7 |
HIP 88882 |
23.23 |
| 2026-06-04 00:00 |
18:10:34.16 |
+43:26:19.4 |
HIP 88882 |
21.89 |
| 2026-06-04 12:00 |
18:10:25.37 |
+43:26:40.2 |
HIP 88882 |
20.58 |
| 2026-06-05 00:00 |
18:10:16.53 |
+43:27:00.0 |
HIP 88882 |
19.30 |
| 2026-06-05 12:00 |
18:10:07.67 |
+43:27:18.7 |
HIP 88882 |
18.07 |
| 2026-06-06 00:00 |
18:09:58.78 |
+43:27:36.5 |
HIP 88882 |
16.90 |
| 2026-06-06 12:00 |
18:09:49.85 |
+43:27:53.3 |
HIP 88882 |
15.79 |
| 2026-06-07 00:00 |
18:09:40.90 |
+43:28:09.1 |
HIP 88882 |
14.77 |
| 2026-06-07 12:00 |
18:09:31.91 |
+43:28:23.8 |
HIP 88882 |
13.86 |
| 2026-06-08 00:00 |
18:09:22.90 |
+43:28:37.6 |
HIP 88882 |
13.07 |
| 2026-06-08 12:00 |
18:09:13.86 |
+43:28:50.3 |
HIP 88882 |
12.44 |
| 2026-06-09 00:00 |
18:09:04.79 |
+43:29:02.1 |
HIP 88882 |
11.99 |
| 2026-06-09 12:00 |
18:08:55.70 |
+43:29:12.8 |
HIP 88882 |
11.73 |
| 2026-06-10 00:00 |
18:08:46.59 |
+43:29:22.5 |
HIP 88882 |
11.70 |
| 2026-06-10 12:00 |
18:08:37.45 |
+43:29:31.2 |
HIP 88882 |
11.88 |
| 2026-06-11 00:00 |
18:08:28.29 |
+43:29:38.8 |
HIP 88788 |
10.97 |
| 2026-06-11 12:00 |
18:08:19.11 |
+43:29:45.5 |
HIP 88788 |
9.36 |
| 2026-06-12 00:00 |
18:08:09.91 |
+43:29:51.1 |
HIP 88788 |
7.77 |
| 2026-06-12 12:00 |
18:08:00.69 |
+43:29:55.6 |
HIP 88788 |
6.20 |
| 2026-06-13 00:00 |
18:07:51.45 |
+43:29:59.2 |
HIP 88788 |
4.70 |
| 2026-06-13 12:00 |
18:07:42.20 |
+43:30:01.7 |
HIP 88788 |
3.36 |
| 2026-06-14 00:00 |
18:07:32.93 |
+43:30:03.1 |
HIP 88788 |
2.45 |
| 2026-06-14 12:00 |
18:07:23.64 |
+43:30:03.6 |
HIP 88788 |
2.51 |
| 2026-06-15 00:00 |
18:07:14.34 |
+43:30:02.9 |
HIP 88788 |
3.50 |
| 2026-06-15 12:00 |
18:07:05.03 |
+43:30:01.3 |
HIP 88722 |
4.30 |
| 2026-06-16 00:00 |
18:06:55.71 |
+43:29:58.6 |
HIP 88722 |
3.22 |
| 2026-06-16 12:00 |
18:06:46.37 |
+43:29:54.8 |
HIP 88722 |
2.81 |
| 2026-06-17 00:00 |
18:06:37.03 |
+43:29:50.0 |
HIP 88722 |
3.32 |
| 2026-06-17 12:00 |
18:06:27.68 |
+43:29:44.2 |
HIP 88722 |
4.45 |
| 2026-06-18 00:00 |
18:06:18.32 |
+43:29:37.3 |
HIP 88722 |
5.86 |
| 2026-06-18 12:00 |
18:06:08.96 |
+43:29:29.3 |
HIP 88722 |
7.39 |
| 2026-06-19 00:00 |
18:05:59.59 |
+43:29:20.4 |
HIP 88722 |
8.98 |
| 2026-06-19 12:00 |
18:05:50.22 |
+43:29:10.3 |
HIP 88722 |
10.60 |
| 2026-06-20 00:00 |
18:05:40.84 |
+43:28:59.3 |
HIP 88722 |
12.24 |
| 2026-06-20 12:00 |
18:05:31.46 |
+43:28:47.2 |
HIP 88722 |
13.90 |
| 2026-06-21 00:00 |
18:05:22.09 |
+43:28:34.0 |
HIP 88722 |
15.57 |
| 2026-06-21 12:00 |
18:05:12.71 |
+43:28:19.8 |
HIP 88722 |
17.25 |
| 2026-06-22 00:00 |
18:05:03.33 |
+43:28:04.6 |
HIP 88722 |
18.93 |