C/2019 O2 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2019 O2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-04-07T19:22:50.350080Z |
| Orbit solution date (soln_date, UTC) |
2025-07-07T14:12:18Z |
| Obs used |
558 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
4.500 |
| 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) |
2021-05-25.0000000 |
| e |
0.83111851 |
| q (au) |
9.682805 |
| a (au) |
57.334911 |
| i (deg) |
93.288372 |
| Ω (om, deg) |
48.307057 |
| ω (w, deg) |
129.662847 |
| M (ma, deg) |
358.449850 |
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 |
1.000 |
| gb |
-0.582 |
| k |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
15:34:16.68 |
-10:45:01.2 |
HIP 76079 |
34.67 |
| 2026-02-03 12:00 |
15:34:17.56 |
-10:45:44.0 |
HIP 76079 |
35.24 |
| 2026-02-04 00:00 |
15:34:18.35 |
-10:46:26.5 |
HIP 76079 |
35.80 |
| 2026-02-04 12:00 |
15:34:19.06 |
-10:47:08.6 |
HIP 76079 |
36.34 |
| 2026-02-05 00:00 |
15:34:19.67 |
-10:47:50.5 |
HIP 76079 |
36.86 |
| 2026-02-05 12:00 |
15:34:20.19 |
-10:48:32.0 |
HIP 76079 |
37.38 |
| 2026-02-06 00:00 |
15:34:20.62 |
-10:49:13.3 |
HIP 76079 |
37.87 |
| 2026-02-06 12:00 |
15:34:20.96 |
-10:49:54.2 |
HIP 76079 |
38.35 |
| 2026-02-07 00:00 |
15:34:21.21 |
-10:50:34.9 |
HIP 76079 |
38.82 |
| 2026-02-07 12:00 |
15:34:21.37 |
-10:51:15.2 |
HIP 76079 |
39.27 |
| 2026-02-08 00:00 |
15:34:21.43 |
-10:51:55.2 |
HIP 76079 |
39.71 |
| 2026-02-08 12:00 |
15:34:21.40 |
-10:52:35.0 |
HIP 76079 |
40.14 |
| 2026-02-09 00:00 |
15:34:21.28 |
-10:53:14.4 |
HIP 76079 |
40.55 |
| 2026-02-09 12:00 |
15:34:21.06 |
-10:53:53.5 |
HIP 76079 |
40.94 |
| 2026-02-10 00:00 |
15:34:20.75 |
-10:54:32.4 |
HIP 76079 |
41.33 |
| 2026-02-10 12:00 |
15:34:20.34 |
-10:55:10.9 |
HIP 76079 |
41.69 |
| 2026-02-11 00:00 |
15:34:19.84 |
-10:55:49.1 |
HIP 76079 |
42.05 |
| 2026-02-11 12:00 |
15:34:19.25 |
-10:56:27.1 |
HIP 76079 |
42.39 |
| 2026-02-12 00:00 |
15:34:18.56 |
-10:57:04.7 |
HIP 76079 |
42.72 |
| 2026-02-12 12:00 |
15:34:17.78 |
-10:57:42.1 |
HIP 76020 |
42.66 |
| 2026-02-13 00:00 |
15:34:16.90 |
-10:58:19.1 |
HIP 76020 |
42.22 |
| 2026-02-13 12:00 |
15:34:15.92 |
-10:58:55.9 |
HIP 76020 |
41.76 |
| 2026-02-14 00:00 |
15:34:14.85 |
-10:59:32.4 |
HIP 76020 |
41.29 |
| 2026-02-14 12:00 |
15:34:13.68 |
-11:00:08.5 |
HIP 76020 |
40.81 |
| 2026-02-15 00:00 |
15:34:12.42 |
-11:00:44.4 |
HIP 76020 |
40.31 |
| 2026-02-15 12:00 |
15:34:11.06 |
-11:01:20.0 |
HIP 76020 |
39.79 |
| 2026-02-16 00:00 |
15:34:09.60 |
-11:01:55.4 |
HIP 76020 |
39.26 |
| 2026-02-16 12:00 |
15:34:08.04 |
-11:02:30.4 |
HIP 76020 |
38.71 |
| 2026-02-17 00:00 |
15:34:06.39 |
-11:03:05.1 |
HIP 76020 |
38.15 |
| 2026-02-17 12:00 |
15:34:04.64 |
-11:03:39.6 |
HIP 76020 |
37.57 |
| 2026-02-18 00:00 |
15:34:02.79 |
-11:04:13.8 |
HIP 76020 |
36.97 |
| 2026-02-18 12:00 |
15:34:00.84 |
-11:04:47.7 |
HIP 76020 |
36.35 |
| 2026-02-19 00:00 |
15:33:58.80 |
-11:05:21.3 |
HIP 76020 |
35.72 |
| 2026-02-19 12:00 |
15:33:56.66 |
-11:05:54.6 |
HIP 76020 |
35.07 |
| 2026-02-20 00:00 |
15:33:54.42 |
-11:06:27.7 |
HIP 76020 |
34.40 |
| 2026-02-20 12:00 |
15:33:52.08 |
-11:07:00.5 |
HIP 76020 |
33.72 |
| 2026-02-21 00:00 |
15:33:49.64 |
-11:07:33.0 |
HIP 76020 |
33.02 |
| 2026-02-21 12:00 |
15:33:47.11 |
-11:08:05.3 |
HIP 76020 |
32.30 |
| 2026-02-22 00:00 |
15:33:44.47 |
-11:08:37.3 |
HIP 76020 |
31.56 |
| 2026-02-22 12:00 |
15:33:41.74 |
-11:09:09.0 |
HIP 76020 |
30.80 |
| 2026-02-23 00:00 |
15:33:38.91 |
-11:09:40.4 |
HIP 76020 |
30.03 |
| 2026-02-23 12:00 |
15:33:35.98 |
-11:10:11.6 |
HIP 76020 |
29.23 |
| 2026-02-24 00:00 |
15:33:32.95 |
-11:10:42.5 |
HIP 76020 |
28.42 |