| Parameter |
Value |
| Designation |
403P/CATALINA |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-09-15T08:40:13.650240Z |
| Orbit solution date (soln_date, UTC) |
2021-05-02T23:43:05Z |
| Obs used |
215 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
23.500 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-10-15T10:46:13.209600Z |
| Discovery magnitude (MPC) |
19.79 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-02-13.0000000 |
| e |
0.50365776 |
| q (au) |
2.684426 |
| a (au) |
5.408417 |
| i (deg) |
12.323320 |
| Ω (om, deg) |
163.851340 |
| ω (w, deg) |
277.851227 |
| M (ma, deg) |
200.037302 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.145 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.145 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.540 |
| 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 |
17:02:26.80 |
-08:40:00.7 |
HIP 83440 |
24.01 |
| 2026-06-01 12:00 |
17:02:14.59 |
-08:39:37.1 |
HIP 83440 |
25.92 |
| 2026-06-02 00:00 |
17:02:02.36 |
-08:39:13.9 |
HIP 83440 |
28.03 |
| 2026-06-02 12:00 |
17:01:50.12 |
-08:38:51.2 |
HIP 83440 |
30.29 |
| 2026-06-03 00:00 |
17:01:37.87 |
-08:38:29.0 |
HIP 83440 |
32.69 |
| 2026-06-03 12:00 |
17:01:25.60 |
-08:38:07.2 |
HIP 83440 |
35.18 |
| 2026-06-04 00:00 |
17:01:13.32 |
-08:37:45.9 |
HIP 83103 |
34.31 |
| 2026-06-04 12:00 |
17:01:01.04 |
-08:37:25.0 |
HIP 83103 |
31.27 |
| 2026-06-05 00:00 |
17:00:48.75 |
-08:37:04.6 |
HIP 83103 |
28.23 |
| 2026-06-05 12:00 |
17:00:36.45 |
-08:36:44.7 |
HIP 83103 |
25.19 |
| 2026-06-06 00:00 |
17:00:24.15 |
-08:36:25.3 |
HIP 83103 |
22.16 |
| 2026-06-06 12:00 |
17:00:11.84 |
-08:36:06.3 |
HIP 83103 |
19.14 |
| 2026-06-07 00:00 |
16:59:59.54 |
-08:35:47.8 |
HIP 83103 |
16.13 |
| 2026-06-07 12:00 |
16:59:47.23 |
-08:35:29.8 |
HIP 83103 |
13.14 |
| 2026-06-08 00:00 |
16:59:34.93 |
-08:35:12.3 |
HIP 83103 |
10.18 |
| 2026-06-08 12:00 |
16:59:22.63 |
-08:34:55.2 |
HIP 83103 |
7.31 |
| 2026-06-09 00:00 |
16:59:10.33 |
-08:34:38.7 |
HIP 83103 |
4.67 |
| 2026-06-09 12:00 |
16:58:58.04 |
-08:34:22.6 |
HIP 83103 |
2.97 |
| 2026-06-10 00:00 |
16:58:45.76 |
-08:34:07.1 |
HIP 83103 |
3.78 |
| 2026-06-10 12:00 |
16:58:33.49 |
-08:33:52.0 |
HIP 83103 |
6.19 |
| 2026-06-11 00:00 |
16:58:21.22 |
-08:33:37.4 |
HIP 83103 |
8.99 |
| 2026-06-11 12:00 |
16:58:08.97 |
-08:33:23.3 |
HIP 83103 |
11.90 |
| 2026-06-12 00:00 |
16:57:56.74 |
-08:33:09.8 |
HIP 83103 |
14.85 |
| 2026-06-12 12:00 |
16:57:44.52 |
-08:32:56.7 |
HIP 83103 |
17.83 |
| 2026-06-13 00:00 |
16:57:32.31 |
-08:32:44.1 |
HIP 83103 |
20.82 |
| 2026-06-13 12:00 |
16:57:20.13 |
-08:32:32.1 |
HIP 83103 |
23.81 |
| 2026-06-14 00:00 |
16:57:07.97 |
-08:32:20.5 |
HIP 83103 |
26.80 |
| 2026-06-14 12:00 |
16:56:55.82 |
-08:32:09.5 |
HIP 82817 |
24.60 |
| 2026-06-15 00:00 |
16:56:43.70 |
-08:31:59.0 |
HIP 82817 |
21.94 |
| 2026-06-15 12:00 |
16:56:31.61 |
-08:31:49.0 |
HIP 82817 |
19.40 |
| 2026-06-16 00:00 |
16:56:19.54 |
-08:31:39.5 |
HIP 82817 |
17.01 |
| 2026-06-16 12:00 |
16:56:07.50 |
-08:31:30.5 |
HIP 82817 |
14.86 |
| 2026-06-17 00:00 |
16:55:55.49 |
-08:31:22.1 |
HIP 82817 |
13.05 |
| 2026-06-17 12:00 |
16:55:43.52 |
-08:31:14.1 |
HIP 82817 |
11.73 |
| 2026-06-18 00:00 |
16:55:31.57 |
-08:31:06.7 |
HIP 82817 |
11.07 |
| 2026-06-18 12:00 |
16:55:19.66 |
-08:30:59.8 |
HIP 82817 |
11.20 |
| 2026-06-19 00:00 |
16:55:07.79 |
-08:30:53.4 |
HIP 82817 |
12.07 |
| 2026-06-19 12:00 |
16:54:55.95 |
-08:30:47.6 |
HIP 82817 |
13.53 |
| 2026-06-20 00:00 |
16:54:44.15 |
-08:30:42.3 |
HIP 82809 |
15.41 |
| 2026-06-20 12:00 |
16:54:32.39 |
-08:30:37.5 |
HIP 82809 |
17.43 |
| 2026-06-21 00:00 |
16:54:20.68 |
-08:30:33.2 |
HIP 82809 |
19.67 |
| 2026-06-21 12:00 |
16:54:09.00 |
-08:30:29.4 |
HIP 82809 |
22.06 |
| 2026-06-22 00:00 |
16:53:57.37 |
-08:30:26.2 |
HIP 82809 |
24.55 |