| 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 · 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 |
0.998 |
| 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) |
| 2026-03-26 00:00 |
17:18:46.62 |
-10:14:50.9 |
HIP 84678 |
2.28 |
| 2026-03-26 12:00 |
17:18:46.67 |
-10:14:03.0 |
HIP 84678 |
1.78 |
| 2026-03-27 00:00 |
17:18:46.60 |
-10:13:15.0 |
HIP 84678 |
1.53 |
| 2026-03-27 12:00 |
17:18:46.40 |
-10:12:26.8 |
HIP 84678 |
1.63 |
| 2026-03-28 00:00 |
17:18:46.07 |
-10:11:38.6 |
HIP 84678 |
2.06 |
| 2026-03-28 12:00 |
17:18:45.62 |
-10:10:50.3 |
HIP 84678 |
2.65 |
| 2026-03-29 00:00 |
17:18:45.03 |
-10:10:01.8 |
HIP 84678 |
3.33 |
| 2026-03-29 12:00 |
17:18:44.32 |
-10:09:13.3 |
HIP 84678 |
4.05 |
| 2026-03-30 00:00 |
17:18:43.48 |
-10:08:24.7 |
HIP 84678 |
4.80 |
| 2026-03-30 12:00 |
17:18:42.51 |
-10:07:36.0 |
HIP 84678 |
5.58 |
| 2026-03-31 00:00 |
17:18:41.41 |
-10:06:47.2 |
HIP 84678 |
6.37 |
| 2026-03-31 12:00 |
17:18:40.18 |
-10:05:58.4 |
HIP 84678 |
7.18 |
| 2026-04-01 00:00 |
17:18:38.83 |
-10:05:09.5 |
HIP 84678 |
8.01 |
| 2026-04-01 12:00 |
17:18:37.35 |
-10:04:20.5 |
HIP 84678 |
8.85 |
| 2026-04-02 00:00 |
17:18:35.74 |
-10:03:31.5 |
HIP 84678 |
9.70 |
| 2026-04-02 12:00 |
17:18:34.00 |
-10:02:42.4 |
HIP 84678 |
10.57 |
| 2026-04-03 00:00 |
17:18:32.14 |
-10:01:53.2 |
HIP 84678 |
11.45 |
| 2026-04-03 12:00 |
17:18:30.15 |
-10:01:04.0 |
HIP 84678 |
12.35 |
| 2026-04-04 00:00 |
17:18:28.03 |
-10:00:14.7 |
HIP 84678 |
13.27 |
| 2026-04-04 12:00 |
17:18:25.78 |
-09:59:25.4 |
HIP 84678 |
14.20 |
| 2026-04-05 00:00 |
17:18:23.41 |
-09:58:36.1 |
HIP 84678 |
15.14 |
| 2026-04-05 12:00 |
17:18:20.91 |
-09:57:46.7 |
HIP 84678 |
16.11 |
| 2026-04-06 00:00 |
17:18:18.28 |
-09:56:57.3 |
HIP 84678 |
17.09 |
| 2026-04-06 12:00 |
17:18:15.53 |
-09:56:07.9 |
HIP 84678 |
18.09 |
| 2026-04-07 00:00 |
17:18:12.65 |
-09:55:18.5 |
HIP 84678 |
19.11 |
| 2026-04-07 12:00 |
17:18:09.64 |
-09:54:29.0 |
HIP 84678 |
20.15 |
| 2026-04-08 00:00 |
17:18:06.51 |
-09:53:39.5 |
HIP 84678 |
21.21 |
| 2026-04-08 12:00 |
17:18:03.25 |
-09:52:50.0 |
HIP 84678 |
22.29 |
| 2026-04-09 00:00 |
17:17:59.87 |
-09:52:00.5 |
HIP 84678 |
23.38 |
| 2026-04-09 12:00 |
17:17:56.36 |
-09:51:11.0 |
HIP 84678 |
24.50 |
| 2026-04-10 00:00 |
17:17:52.72 |
-09:50:21.5 |
HIP 84678 |
25.64 |
| 2026-04-10 12:00 |
17:17:48.97 |
-09:49:32.1 |
HIP 84678 |
26.80 |
| 2026-04-11 00:00 |
17:17:45.08 |
-09:48:42.6 |
HIP 84678 |
27.99 |
| 2026-04-11 12:00 |
17:17:41.07 |
-09:47:53.1 |
HIP 84678 |
29.19 |
| 2026-04-12 00:00 |
17:17:36.94 |
-09:47:03.7 |
HIP 84430 |
28.58 |
| 2026-04-12 12:00 |
17:17:32.69 |
-09:46:14.3 |
HIP 84430 |
27.59 |
| 2026-04-13 00:00 |
17:17:28.31 |
-09:45:24.9 |
HIP 84430 |
26.60 |
| 2026-04-13 12:00 |
17:17:23.81 |
-09:44:35.6 |
HIP 84430 |
25.61 |
| 2026-04-14 00:00 |
17:17:19.18 |
-09:43:46.3 |
HIP 84430 |
24.63 |
| 2026-04-14 12:00 |
17:17:14.44 |
-09:42:57.1 |
HIP 84430 |
23.67 |
| 2026-04-15 00:00 |
17:17:09.57 |
-09:42:07.9 |
HIP 84430 |
22.72 |
| 2026-04-15 12:00 |
17:17:04.58 |
-09:41:18.7 |
HIP 84430 |
21.80 |
| 2026-04-16 00:00 |
17:16:59.47 |
-09:40:29.7 |
HIP 84430 |
20.92 |