| 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) |
| 2026-09-20 00:00 |
20:37:19.91 |
-12:30:46.1 |
HIP 101706 |
14.76 |
| 2026-09-20 12:00 |
20:37:14.38 |
-12:31:11.3 |
HIP 101706 |
13.86 |
| 2026-09-21 00:00 |
20:37:08.94 |
-12:31:36.2 |
HIP 101706 |
13.07 |
| 2026-09-21 12:00 |
20:37:03.58 |
-12:32:00.9 |
HIP 101706 |
12.39 |
| 2026-09-22 00:00 |
20:36:58.32 |
-12:32:25.3 |
HIP 101706 |
11.83 |
| 2026-09-22 12:00 |
20:36:53.15 |
-12:32:49.4 |
HIP 101706 |
11.41 |
| 2026-09-23 00:00 |
20:36:48.07 |
-12:33:13.3 |
HIP 101706 |
11.13 |
| 2026-09-23 12:00 |
20:36:43.08 |
-12:33:37.0 |
HIP 101706 |
11.00 |
| 2026-09-24 00:00 |
20:36:38.18 |
-12:34:00.4 |
HIP 101706 |
11.02 |
| 2026-09-24 12:00 |
20:36:33.38 |
-12:34:23.5 |
HIP 101706 |
11.16 |
| 2026-09-25 00:00 |
20:36:28.67 |
-12:34:46.4 |
HIP 101706 |
11.43 |
| 2026-09-25 12:00 |
20:36:24.05 |
-12:35:09.0 |
HIP 101706 |
11.81 |
| 2026-09-26 00:00 |
20:36:19.52 |
-12:35:31.3 |
HIP 101706 |
12.28 |
| 2026-09-26 12:00 |
20:36:15.09 |
-12:35:53.3 |
HIP 101706 |
12.83 |
| 2026-09-27 00:00 |
20:36:10.75 |
-12:36:15.1 |
HIP 101706 |
13.43 |
| 2026-09-27 12:00 |
20:36:06.51 |
-12:36:36.6 |
HIP 101647 |
13.95 |
| 2026-09-28 00:00 |
20:36:02.36 |
-12:36:57.8 |
HIP 101647 |
14.50 |
| 2026-09-28 12:00 |
20:35:58.31 |
-12:37:18.8 |
HIP 101647 |
15.10 |
| 2026-09-29 00:00 |
20:35:54.36 |
-12:37:39.4 |
HIP 101647 |
15.73 |
| 2026-09-29 12:00 |
20:35:50.50 |
-12:37:59.8 |
HIP 101647 |
16.39 |
| 2026-09-30 00:00 |
20:35:46.73 |
-12:38:19.9 |
HIP 101647 |
17.07 |
| 2026-09-30 12:00 |
20:35:43.06 |
-12:38:39.7 |
HIP 101647 |
17.76 |
| 2026-10-01 00:00 |
20:35:39.49 |
-12:38:59.2 |
HIP 101647 |
18.46 |
| 2026-10-01 12:00 |
20:35:36.02 |
-12:39:18.4 |
HIP 101606 |
18.42 |
| 2026-10-02 00:00 |
20:35:32.64 |
-12:39:37.3 |
HIP 101606 |
18.06 |
| 2026-10-02 12:00 |
20:35:29.37 |
-12:39:55.9 |
HIP 101606 |
17.73 |
| 2026-10-03 00:00 |
20:35:26.19 |
-12:40:14.2 |
HIP 101606 |
17.45 |
| 2026-10-03 12:00 |
20:35:23.11 |
-12:40:32.2 |
HIP 101606 |
17.20 |
| 2026-10-04 00:00 |
20:35:20.13 |
-12:40:49.9 |
HIP 101606 |
16.99 |
| 2026-10-04 12:00 |
20:35:17.24 |
-12:41:07.3 |
HIP 101606 |
16.81 |
| 2026-10-05 00:00 |
20:35:14.46 |
-12:41:24.3 |
HIP 101606 |
16.67 |
| 2026-10-05 12:00 |
20:35:11.78 |
-12:41:41.1 |
HIP 101606 |
16.56 |
| 2026-10-06 00:00 |
20:35:09.20 |
-12:41:57.5 |
HIP 101606 |
16.47 |
| 2026-10-06 12:00 |
20:35:06.72 |
-12:42:13.6 |
HIP 101606 |
16.41 |
| 2026-10-07 00:00 |
20:35:04.34 |
-12:42:29.4 |
HIP 101606 |
16.37 |
| 2026-10-07 12:00 |
20:35:02.06 |
-12:42:44.9 |
HIP 101606 |
16.35 |
| 2026-10-08 00:00 |
20:34:59.88 |
-12:43:00.1 |
HIP 101606 |
16.35 |
| 2026-10-08 12:00 |
20:34:57.80 |
-12:43:14.9 |
HIP 101606 |
16.36 |
| 2026-10-09 00:00 |
20:34:55.83 |
-12:43:29.4 |
HIP 101468 |
16.34 |
| 2026-10-09 12:00 |
20:34:53.96 |
-12:43:43.5 |
HIP 101468 |
15.89 |
| 2026-10-10 00:00 |
20:34:52.19 |
-12:43:57.3 |
HIP 101468 |
15.47 |
| 2026-10-10 12:00 |
20:34:50.52 |
-12:44:10.8 |
HIP 101468 |
15.08 |
| 2026-10-11 00:00 |
20:34:48.95 |
-12:44:23.9 |
HIP 101468 |
14.72 |