403P/CATALINA
| 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) |
| 2026-02-03 00:00 |
17:08:09.74 |
-11:16:07.0 |
HIP 83655 |
33.76 |
| 2026-02-03 12:00 |
17:08:21.29 |
-11:15:47.5 |
HIP 83655 |
36.60 |
| 2026-02-04 00:00 |
17:08:32.76 |
-11:15:27.5 |
HIP 84026 |
38.03 |
| 2026-02-04 12:00 |
17:08:44.14 |
-11:15:07.2 |
HIP 84026 |
35.62 |
| 2026-02-05 00:00 |
17:08:55.43 |
-11:14:46.4 |
HIP 84026 |
33.29 |
| 2026-02-05 12:00 |
17:09:06.64 |
-11:14:25.3 |
HIP 84026 |
31.05 |
| 2026-02-06 00:00 |
17:09:17.75 |
-11:14:03.8 |
HIP 84026 |
28.90 |
| 2026-02-06 12:00 |
17:09:28.78 |
-11:13:41.8 |
HIP 84026 |
26.87 |
| 2026-02-07 00:00 |
17:09:39.72 |
-11:13:19.5 |
HIP 84026 |
24.99 |
| 2026-02-07 12:00 |
17:09:50.57 |
-11:12:56.8 |
HIP 84026 |
23.27 |
| 2026-02-08 00:00 |
17:10:01.32 |
-11:12:33.8 |
HIP 84026 |
21.75 |
| 2026-02-08 12:00 |
17:10:11.99 |
-11:12:10.3 |
HIP 84026 |
20.47 |
| 2026-02-09 00:00 |
17:10:22.56 |
-11:11:46.4 |
HIP 84026 |
19.47 |
| 2026-02-09 12:00 |
17:10:33.04 |
-11:11:22.2 |
HIP 84026 |
18.77 |
| 2026-02-10 00:00 |
17:10:43.43 |
-11:10:57.6 |
HIP 84026 |
18.42 |
| 2026-02-10 12:00 |
17:10:53.72 |
-11:10:32.6 |
HIP 84026 |
18.41 |
| 2026-02-11 00:00 |
17:11:03.92 |
-11:10:07.3 |
HIP 84026 |
18.73 |
| 2026-02-11 12:00 |
17:11:14.02 |
-11:09:41.5 |
HIP 84026 |
19.38 |
| 2026-02-12 00:00 |
17:11:24.03 |
-11:09:15.4 |
HIP 84026 |
20.29 |
| 2026-02-12 12:00 |
17:11:33.93 |
-11:08:48.9 |
HIP 84026 |
21.44 |
| 2026-02-13 00:00 |
17:11:43.74 |
-11:08:22.1 |
HIP 84026 |
22.78 |
| 2026-02-13 12:00 |
17:11:53.46 |
-11:07:54.8 |
HIP 84026 |
24.26 |
| 2026-02-14 00:00 |
17:12:03.07 |
-11:07:27.3 |
HIP 84026 |
25.87 |
| 2026-02-14 12:00 |
17:12:12.58 |
-11:06:59.3 |
HIP 84026 |
27.57 |
| 2026-02-15 00:00 |
17:12:22.00 |
-11:06:31.0 |
HIP 84026 |
29.34 |
| 2026-02-15 12:00 |
17:12:31.31 |
-11:06:02.3 |
HIP 84161 |
30.76 |
| 2026-02-16 00:00 |
17:12:40.52 |
-11:05:33.3 |
HIP 84161 |
31.51 |
| 2026-02-16 12:00 |
17:12:49.63 |
-11:05:03.9 |
HIP 84161 |
32.42 |
| 2026-02-17 00:00 |
17:12:58.63 |
-11:04:34.2 |
HIP 84161 |
33.45 |
| 2026-02-17 12:00 |
17:13:07.53 |
-11:04:04.1 |
HIP 84161 |
34.60 |
| 2026-02-18 00:00 |
17:13:16.33 |
-11:03:33.7 |
HIP 84161 |
35.84 |
| 2026-02-18 12:00 |
17:13:25.02 |
-11:03:02.9 |
HIP 84161 |
37.17 |
| 2026-02-19 00:00 |
17:13:33.61 |
-11:02:31.8 |
HIP 84161 |
38.58 |
| 2026-02-19 12:00 |
17:13:42.09 |
-11:02:00.3 |
HIP 84476 |
37.48 |
| 2026-02-20 00:00 |
17:13:50.46 |
-11:01:28.5 |
HIP 84476 |
35.36 |
| 2026-02-20 12:00 |
17:13:58.73 |
-11:00:56.4 |
HIP 84476 |
33.26 |
| 2026-02-21 00:00 |
17:14:06.89 |
-11:00:24.0 |
HIP 84476 |
31.19 |
| 2026-02-21 12:00 |
17:14:14.94 |
-10:59:51.2 |
HIP 84476 |
29.14 |
| 2026-02-22 00:00 |
17:14:22.89 |
-10:59:18.1 |
HIP 84476 |
27.12 |
| 2026-02-22 12:00 |
17:14:30.72 |
-10:58:44.6 |
HIP 84476 |
25.12 |
| 2026-02-23 00:00 |
17:14:38.44 |
-10:58:10.9 |
HIP 84476 |
23.15 |
| 2026-02-23 12:00 |
17:14:46.06 |
-10:57:36.8 |
HIP 84476 |
21.21 |
| 2026-02-24 00:00 |
17:14:53.56 |
-10:57:02.4 |
HIP 84476 |
19.29 |