| Parameter |
Value |
| Designation |
C/2019 O2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-04-07T19:27:40.749120Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T14:42:52Z |
| Obs used |
566 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
4.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-07-24T12:32:27.456000Z |
| Discovery magnitude (MPC) |
20.50 i |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-05-29.0000000 |
| e |
0.83111987 |
| q (au) |
9.682798 |
| a (au) |
57.335331 |
| i (deg) |
93.288429 |
| Ω (om, deg) |
48.306749 |
| ω (w, deg) |
129.663000 |
| M (ma, deg) |
358.458941 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.977 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.977 |
| n |
2.000 |
| gf |
0.995 |
| gb |
-0.823 |
| k |
1.000 |
| δ90 |
9.999 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
15:27:35.18 |
-11:34:39.3 |
HIP 75729 |
12.20 |
| 2026-03-26 12:00 |
15:27:26.44 |
-11:34:57.4 |
HIP 75729 |
14.10 |
| 2026-03-27 00:00 |
15:27:17.62 |
-11:35:15.4 |
HIP 75729 |
16.08 |
| 2026-03-27 12:00 |
15:27:08.71 |
-11:35:33.3 |
HIP 75554 |
16.64 |
| 2026-03-28 00:00 |
15:26:59.73 |
-11:35:51.0 |
HIP 75554 |
14.51 |
| 2026-03-28 12:00 |
15:26:50.66 |
-11:36:08.6 |
HIP 75554 |
12.39 |
| 2026-03-29 00:00 |
15:26:41.52 |
-11:36:26.0 |
HIP 75554 |
10.30 |
| 2026-03-29 12:00 |
15:26:32.29 |
-11:36:43.4 |
HIP 75554 |
8.29 |
| 2026-03-30 00:00 |
15:26:22.99 |
-11:37:00.6 |
HIP 75554 |
6.45 |
| 2026-03-30 12:00 |
15:26:13.61 |
-11:37:17.6 |
HIP 75554 |
5.00 |
| 2026-03-31 00:00 |
15:26:04.15 |
-11:37:34.6 |
HIP 75554 |
4.37 |
| 2026-03-31 12:00 |
15:25:54.62 |
-11:37:51.4 |
HIP 75554 |
4.92 |
| 2026-04-01 00:00 |
15:25:45.01 |
-11:38:08.1 |
HIP 75554 |
6.37 |
| 2026-04-01 12:00 |
15:25:35.33 |
-11:38:24.6 |
HIP 75554 |
8.27 |
| 2026-04-02 00:00 |
15:25:25.58 |
-11:38:41.1 |
HIP 75554 |
10.40 |
| 2026-04-02 12:00 |
15:25:15.75 |
-11:38:57.5 |
HIP 75554 |
12.64 |
| 2026-04-03 00:00 |
15:25:05.84 |
-11:39:13.7 |
HIP 75554 |
14.95 |
| 2026-04-03 12:00 |
15:24:55.87 |
-11:39:29.8 |
HIP 75554 |
17.32 |
| 2026-04-04 00:00 |
15:24:45.82 |
-11:39:45.8 |
HIP 75554 |
19.73 |
| 2026-04-04 12:00 |
15:24:35.70 |
-11:40:01.7 |
HIP 75554 |
22.17 |
| 2026-04-05 00:00 |
15:24:25.52 |
-11:40:17.5 |
HIP 75300 |
23.44 |
| 2026-04-05 12:00 |
15:24:15.26 |
-11:40:33.3 |
HIP 75300 |
21.56 |
| 2026-04-06 00:00 |
15:24:04.94 |
-11:40:48.9 |
HIP 75300 |
19.80 |
| 2026-04-06 12:00 |
15:23:54.54 |
-11:41:04.4 |
HIP 75300 |
18.22 |
| 2026-04-07 00:00 |
15:23:44.08 |
-11:41:19.8 |
HIP 75300 |
16.88 |
| 2026-04-07 12:00 |
15:23:33.56 |
-11:41:35.1 |
HIP 75300 |
15.83 |
| 2026-04-08 00:00 |
15:23:22.97 |
-11:41:50.4 |
HIP 75300 |
15.15 |
| 2026-04-08 12:00 |
15:23:12.31 |
-11:42:05.6 |
HIP 75300 |
14.89 |
| 2026-04-09 00:00 |
15:23:01.59 |
-11:42:20.6 |
HIP 75300 |
15.10 |
| 2026-04-09 12:00 |
15:22:50.81 |
-11:42:35.6 |
HIP 75300 |
15.75 |
| 2026-04-10 00:00 |
15:22:39.96 |
-11:42:50.5 |
HIP 75300 |
16.81 |
| 2026-04-10 12:00 |
15:22:29.05 |
-11:43:05.4 |
HIP 75300 |
18.20 |
| 2026-04-11 00:00 |
15:22:18.08 |
-11:43:20.2 |
HIP 75300 |
19.87 |
| 2026-04-11 12:00 |
15:22:07.06 |
-11:43:34.9 |
HIP 75300 |
21.76 |
| 2026-04-12 00:00 |
15:21:55.97 |
-11:43:49.5 |
HIP 75154 |
22.44 |
| 2026-04-12 12:00 |
15:21:44.82 |
-11:44:04.1 |
HIP 75154 |
21.64 |
| 2026-04-13 00:00 |
15:21:33.62 |
-11:44:18.6 |
HIP 75154 |
21.17 |
| 2026-04-13 12:00 |
15:21:22.36 |
-11:44:33.1 |
HIP 75154 |
21.05 |
| 2026-04-14 00:00 |
15:21:11.05 |
-11:44:47.5 |
HIP 75154 |
21.29 |
| 2026-04-14 12:00 |
15:20:59.68 |
-11:45:01.8 |
HIP 75154 |
21.89 |
| 2026-04-15 00:00 |
15:20:48.26 |
-11:45:16.1 |
HIP 75154 |
22.83 |
| 2026-04-15 12:00 |
15:20:36.78 |
-11:45:30.4 |
HIP 75154 |
24.07 |
| 2026-04-16 00:00 |
15:20:25.25 |
-11:45:44.6 |
HIP 75154 |
25.56 |