| 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) |
| 2026-07-29 00:00 |
20:52:51.28 |
-11:35:55.8 |
HIP 103077 |
3.81 |
| 2026-07-29 12:00 |
20:52:41.14 |
-11:36:24.8 |
HIP 103077 |
6.31 |
| 2026-07-30 00:00 |
20:52:30.98 |
-11:36:54.0 |
HIP 103077 |
8.83 |
| 2026-07-30 12:00 |
20:52:20.81 |
-11:37:23.4 |
HIP 103077 |
11.36 |
| 2026-07-31 00:00 |
20:52:10.63 |
-11:37:52.9 |
HIP 102994 |
11.77 |
| 2026-07-31 12:00 |
20:52:00.44 |
-11:38:22.7 |
HIP 102994 |
12.01 |
| 2026-08-01 00:00 |
20:51:50.25 |
-11:38:52.6 |
HIP 102994 |
12.77 |
| 2026-08-01 12:00 |
20:51:40.04 |
-11:39:22.7 |
HIP 102994 |
13.96 |
| 2026-08-02 00:00 |
20:51:29.84 |
-11:39:52.9 |
HIP 102994 |
15.48 |
| 2026-08-02 12:00 |
20:51:19.62 |
-11:40:23.3 |
HIP 102994 |
17.26 |
| 2026-08-03 00:00 |
20:51:09.41 |
-11:40:53.9 |
HIP 102994 |
19.21 |
| 2026-08-03 12:00 |
20:50:59.19 |
-11:41:24.6 |
HIP 102994 |
21.29 |
| 2026-08-04 00:00 |
20:50:48.97 |
-11:41:55.5 |
HIP 102994 |
23.47 |
| 2026-08-04 12:00 |
20:50:38.75 |
-11:42:26.5 |
HIP 102785 |
23.56 |
| 2026-08-05 00:00 |
20:50:28.53 |
-11:42:57.6 |
HIP 102785 |
22.06 |
| 2026-08-05 12:00 |
20:50:18.31 |
-11:43:28.9 |
HIP 102785 |
20.78 |
| 2026-08-06 00:00 |
20:50:08.10 |
-11:44:00.3 |
HIP 102785 |
19.75 |
| 2026-08-06 12:00 |
20:49:57.89 |
-11:44:31.9 |
HIP 102785 |
19.02 |
| 2026-08-07 00:00 |
20:49:47.68 |
-11:45:03.6 |
HIP 102785 |
18.61 |
| 2026-08-07 12:00 |
20:49:37.48 |
-11:45:35.4 |
HIP 102785 |
18.54 |
| 2026-08-08 00:00 |
20:49:27.29 |
-11:46:07.3 |
HIP 102785 |
18.83 |
| 2026-08-08 12:00 |
20:49:17.11 |
-11:46:39.3 |
HIP 102785 |
19.46 |
| 2026-08-09 00:00 |
20:49:06.94 |
-11:47:11.4 |
HIP 102785 |
20.38 |
| 2026-08-09 12:00 |
20:48:56.78 |
-11:47:43.6 |
HIP 102785 |
21.57 |
| 2026-08-10 00:00 |
20:48:46.63 |
-11:48:16.0 |
HIP 102785 |
22.99 |
| 2026-08-10 12:00 |
20:48:36.50 |
-11:48:48.4 |
HIP 102785 |
24.58 |
| 2026-08-11 00:00 |
20:48:26.38 |
-11:49:20.9 |
HIP 102785 |
26.32 |
| 2026-08-11 12:00 |
20:48:16.28 |
-11:49:53.5 |
HIP 102785 |
28.18 |
| 2026-08-12 00:00 |
20:48:06.20 |
-11:50:26.1 |
HIP 102785 |
30.14 |
| 2026-08-12 12:00 |
20:47:56.13 |
-11:50:58.9 |
HIP 102785 |
32.18 |
| 2026-08-13 00:00 |
20:47:46.08 |
-11:51:31.7 |
HIP 102569 |
33.15 |
| 2026-08-13 12:00 |
20:47:36.06 |
-11:52:04.5 |
HIP 102569 |
32.04 |
| 2026-08-14 00:00 |
20:47:26.06 |
-11:52:37.5 |
HIP 102569 |
31.08 |
| 2026-08-14 12:00 |
20:47:16.08 |
-11:53:10.4 |
HIP 102569 |
30.31 |
| 2026-08-15 00:00 |
20:47:06.12 |
-11:53:43.5 |
HIP 102569 |
29.72 |
| 2026-08-15 12:00 |
20:46:56.19 |
-11:54:16.5 |
HIP 102569 |
29.34 |
| 2026-08-16 00:00 |
20:46:46.29 |
-11:54:49.6 |
HIP 102569 |
29.16 |
| 2026-08-16 12:00 |
20:46:36.42 |
-11:55:22.8 |
HIP 102569 |
29.18 |
| 2026-08-17 00:00 |
20:46:26.57 |
-11:55:55.9 |
HIP 102569 |
29.42 |
| 2026-08-17 12:00 |
20:46:16.76 |
-11:56:29.1 |
HIP 102569 |
29.85 |
| 2026-08-18 00:00 |
20:46:06.98 |
-11:57:02.3 |
HIP 102569 |
30.47 |
| 2026-08-18 12:00 |
20:45:57.23 |
-11:57:35.5 |
HIP 102569 |
31.27 |
| 2026-08-19 00:00 |
20:45:47.51 |
-11:58:08.8 |
HIP 102343 |
30.57 |