330P/Catalina
| Parameter |
Value |
| Designation |
330P/Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-08-31T23:24:07.214400Z |
| Orbit solution date (soln_date, UTC) |
2023-05-03T22:44:38Z |
| Obs used |
342 |
| NEO |
- |
| M1 |
10.100 |
| K1 |
13.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-03-04.0000000 |
| e |
0.54934611 |
| q (au) |
2.969730 |
| a (au) |
6.589825 |
| i (deg) |
15.547744 |
| Ω (om, deg) |
294.337435 |
| ω (w, deg) |
186.716087 |
| M (ma, deg) |
243.009233 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.019 + 5.531\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.019 |
| n |
5.531 |
| gf |
1.000 |
| gb |
-0.909 |
| 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) |
| 2026-02-03 00:00 |
20:40:14.04 |
-14:24:00.0 |
HIP 102061 |
13.02 |
| 2026-02-03 12:00 |
20:40:26.73 |
-14:23:01.0 |
HIP 102061 |
11.15 |
| 2026-02-04 00:00 |
20:40:39.40 |
-14:22:02.0 |
HIP 102061 |
10.01 |
| 2026-02-04 12:00 |
20:40:52.07 |
-14:21:02.8 |
HIP 102061 |
9.84 |
| 2026-02-05 00:00 |
20:41:04.72 |
-14:20:03.6 |
HIP 102061 |
10.68 |
| 2026-02-05 12:00 |
20:41:17.37 |
-14:19:04.2 |
HIP 102061 |
12.34 |
| 2026-02-06 00:00 |
20:41:30.00 |
-14:18:04.7 |
HIP 102061 |
14.53 |
| 2026-02-06 12:00 |
20:41:42.62 |
-14:17:05.2 |
HIP 102061 |
17.04 |
| 2026-02-07 00:00 |
20:41:55.22 |
-14:16:05.5 |
HIP 102061 |
19.76 |
| 2026-02-07 12:00 |
20:42:07.81 |
-14:15:05.7 |
HIP 102061 |
22.61 |
| 2026-02-08 00:00 |
20:42:20.39 |
-14:14:05.9 |
HIP 102257 |
25.05 |
| 2026-02-08 12:00 |
20:42:32.95 |
-14:13:06.0 |
HIP 102257 |
22.73 |
| 2026-02-09 00:00 |
20:42:45.50 |
-14:12:05.9 |
HIP 102257 |
20.65 |
| 2026-02-09 12:00 |
20:42:58.02 |
-14:11:05.8 |
HIP 102257 |
18.88 |
| 2026-02-10 00:00 |
20:43:10.54 |
-14:10:05.6 |
HIP 102257 |
17.53 |
| 2026-02-10 12:00 |
20:43:23.03 |
-14:09:05.4 |
HIP 102257 |
16.68 |
| 2026-02-11 00:00 |
20:43:35.51 |
-14:08:05.0 |
HIP 102371 |
14.33 |
| 2026-02-11 12:00 |
20:43:47.97 |
-14:07:04.6 |
HIP 102371 |
11.71 |
| 2026-02-12 00:00 |
20:44:00.41 |
-14:06:04.1 |
HIP 102371 |
9.45 |
| 2026-02-12 12:00 |
20:44:12.83 |
-14:05:03.5 |
HIP 102371 |
7.85 |
| 2026-02-13 00:00 |
20:44:25.22 |
-14:04:02.9 |
HIP 102371 |
7.36 |
| 2026-02-13 12:00 |
20:44:37.60 |
-14:03:02.2 |
HIP 102371 |
8.18 |
| 2026-02-14 00:00 |
20:44:49.96 |
-14:02:01.4 |
HIP 102371 |
9.98 |
| 2026-02-14 12:00 |
20:45:02.29 |
-14:01:00.6 |
HIP 102371 |
12.34 |
| 2026-02-15 00:00 |
20:45:14.60 |
-13:59:59.7 |
HIP 102371 |
14.99 |
| 2026-02-15 12:00 |
20:45:26.89 |
-13:58:58.8 |
HIP 102371 |
17.81 |
| 2026-02-16 00:00 |
20:45:39.15 |
-13:57:57.8 |
HIP 102371 |
20.71 |
| 2026-02-16 12:00 |
20:45:51.39 |
-13:56:56.8 |
HIP 102371 |
23.68 |
| 2026-02-17 00:00 |
20:46:03.61 |
-13:55:55.7 |
HIP 102371 |
26.68 |
| 2026-02-17 12:00 |
20:46:15.79 |
-13:54:54.6 |
HIP 102371 |
29.70 |
| 2026-02-18 00:00 |
20:46:27.96 |
-13:53:53.4 |
HIP 102371 |
32.73 |
| 2026-02-18 12:00 |
20:46:40.09 |
-13:52:52.2 |
HIP 102671 |
33.55 |
| 2026-02-19 00:00 |
20:46:52.19 |
-13:51:51.0 |
HIP 102671 |
30.77 |
| 2026-02-19 12:00 |
20:47:04.27 |
-13:50:49.7 |
HIP 102671 |
28.06 |
| 2026-02-20 00:00 |
20:47:16.32 |
-13:49:48.4 |
HIP 102671 |
25.45 |
| 2026-02-20 12:00 |
20:47:28.34 |
-13:48:47.1 |
HIP 102671 |
22.96 |
| 2026-02-21 00:00 |
20:47:40.33 |
-13:47:45.7 |
HIP 102671 |
20.64 |
| 2026-02-21 12:00 |
20:47:52.29 |
-13:46:44.4 |
HIP 102671 |
18.54 |
| 2026-02-22 00:00 |
20:48:04.21 |
-13:45:43.0 |
HIP 102671 |
16.76 |
| 2026-02-22 12:00 |
20:48:16.11 |
-13:44:41.6 |
HIP 102671 |
15.38 |
| 2026-02-23 00:00 |
20:48:27.97 |
-13:43:40.2 |
HIP 102671 |
14.53 |
| 2026-02-23 12:00 |
20:48:39.80 |
-13:42:38.8 |
HIP 102671 |
14.30 |
| 2026-02-24 00:00 |
20:48:51.59 |
-13:41:37.3 |
HIP 102671 |
14.70 |