| Parameter |
Value |
| Designation |
C/2019 O3 (Palomar) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-03-08T21:27:10.964160Z |
| Orbit solution date (soln_date, UTC) |
2025-02-13T09:52:49Z |
| Obs used |
2138 |
| NEO |
- |
| M1 |
6.100 |
| K1 |
6.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-07-26T05:21:28.800000Z |
| Discovery magnitude (MPC) |
19.30 r |
| Discovery observatory (MPC) |
I41 · Palomar Mountain–ZTF |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-03-22.0000000 |
| e |
1.00359769 |
| q (au) |
8.820012 |
| a (au) |
-2451.574872 |
| i (deg) |
89.818764 |
| Ω (om, deg) |
300.392129 |
| ω (w, deg) |
60.096036 |
| M (ma, deg) |
0.003070 |
Magnitude
Scatter + Global Linear
$$
M_a = (-1.506 + 5.405\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
-1.506 |
| n |
5.405 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
08:59:58.36 |
+63:47:41.5 |
HIP 44107 |
22.89 |
| 2026-06-01 12:00 |
09:00:04.86 |
+63:45:35.8 |
HIP 44107 |
21.12 |
| 2026-06-02 00:00 |
09:00:11.48 |
+63:43:30.4 |
HIP 44107 |
19.46 |
| 2026-06-02 12:00 |
09:00:18.20 |
+63:41:25.2 |
HIP 44107 |
17.92 |
| 2026-06-03 00:00 |
09:00:25.03 |
+63:39:20.4 |
HIP 44107 |
16.55 |
| 2026-06-03 12:00 |
09:00:31.96 |
+63:37:15.8 |
HIP 44107 |
15.39 |
| 2026-06-04 00:00 |
09:00:39.00 |
+63:35:11.5 |
HIP 44107 |
14.49 |
| 2026-06-04 12:00 |
09:00:46.15 |
+63:33:07.5 |
HIP 44107 |
13.91 |
| 2026-06-05 00:00 |
09:00:53.40 |
+63:31:03.8 |
HIP 44107 |
13.68 |
| 2026-06-05 12:00 |
09:01:00.76 |
+63:29:00.4 |
HIP 44107 |
13.82 |
| 2026-06-06 00:00 |
09:01:08.22 |
+63:26:57.3 |
HIP 44107 |
14.32 |
| 2026-06-06 12:00 |
09:01:15.78 |
+63:24:54.4 |
HIP 44397 |
13.62 |
| 2026-06-07 00:00 |
09:01:23.43 |
+63:22:52.0 |
HIP 44397 |
11.56 |
| 2026-06-07 12:00 |
09:01:31.19 |
+63:20:49.8 |
HIP 44397 |
9.55 |
| 2026-06-08 00:00 |
09:01:39.05 |
+63:18:47.9 |
HIP 44397 |
7.64 |
| 2026-06-08 12:00 |
09:01:47.00 |
+63:16:46.4 |
HIP 44397 |
5.95 |
| 2026-06-09 00:00 |
09:01:55.05 |
+63:14:45.1 |
HIP 44397 |
4.69 |
| 2026-06-09 12:00 |
09:02:03.20 |
+63:12:44.2 |
HIP 44397 |
4.29 |
| 2026-06-10 00:00 |
09:02:11.44 |
+63:10:43.7 |
HIP 44397 |
4.94 |
| 2026-06-10 12:00 |
09:02:19.77 |
+63:08:43.4 |
HIP 44397 |
6.33 |
| 2026-06-11 00:00 |
09:02:28.20 |
+63:06:43.5 |
HIP 44397 |
8.09 |
| 2026-06-11 12:00 |
09:02:36.71 |
+63:04:44.0 |
HIP 44397 |
10.02 |
| 2026-06-12 00:00 |
09:02:45.32 |
+63:02:44.8 |
HIP 44397 |
12.05 |
| 2026-06-12 12:00 |
09:02:54.02 |
+63:00:45.9 |
HIP 44397 |
14.13 |
| 2026-06-13 00:00 |
09:03:02.81 |
+62:58:47.4 |
HIP 44397 |
16.24 |
| 2026-06-13 12:00 |
09:03:11.68 |
+62:56:49.3 |
HIP 44397 |
18.37 |
| 2026-06-14 00:00 |
09:03:20.64 |
+62:54:51.5 |
HIP 44397 |
20.51 |
| 2026-06-14 12:00 |
09:03:29.68 |
+62:52:54.1 |
HIP 44678 |
19.50 |
| 2026-06-15 00:00 |
09:03:38.81 |
+62:50:57.1 |
HIP 44678 |
18.35 |
| 2026-06-15 12:00 |
09:03:48.03 |
+62:49:00.4 |
HIP 44678 |
17.41 |
| 2026-06-16 00:00 |
09:03:57.32 |
+62:47:04.1 |
HIP 44678 |
16.69 |
| 2026-06-16 12:00 |
09:04:06.70 |
+62:45:08.2 |
HIP 44678 |
16.23 |
| 2026-06-17 00:00 |
09:04:16.16 |
+62:43:12.7 |
HIP 44678 |
16.04 |
| 2026-06-17 12:00 |
09:04:25.69 |
+62:41:17.5 |
HIP 44678 |
16.15 |
| 2026-06-18 00:00 |
09:04:35.31 |
+62:39:22.8 |
HIP 44678 |
16.54 |
| 2026-06-18 12:00 |
09:04:45.00 |
+62:37:28.4 |
HIP 44678 |
17.20 |
| 2026-06-19 00:00 |
09:04:54.76 |
+62:35:34.5 |
HIP 44678 |
18.09 |
| 2026-06-19 12:00 |
09:05:04.61 |
+62:33:40.9 |
HIP 44587 |
17.98 |
| 2026-06-20 00:00 |
09:05:14.52 |
+62:31:47.8 |
HIP 44587 |
16.17 |
| 2026-06-20 12:00 |
09:05:24.51 |
+62:29:55.0 |
HIP 44587 |
14.47 |
| 2026-06-21 00:00 |
09:05:34.57 |
+62:28:02.7 |
HIP 44587 |
12.94 |
| 2026-06-21 12:00 |
09:05:44.70 |
+62:26:10.8 |
HIP 44587 |
11.64 |
| 2026-06-22 00:00 |
09:05:54.89 |
+62:24:19.3 |
HIP 44587 |
10.65 |