| 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) |
| 2026-05-12 00:00 |
21:07:26.32 |
-11:30:40.4 |
HIP 104186 |
29.95 |
| 2026-05-12 12:00 |
21:07:27.34 |
-11:30:10.5 |
HIP 104186 |
30.51 |
| 2026-05-13 00:00 |
21:07:28.27 |
-11:29:41.1 |
HIP 104186 |
31.05 |
| 2026-05-13 12:00 |
21:07:29.11 |
-11:29:12.0 |
HIP 104186 |
31.58 |
| 2026-05-14 00:00 |
21:07:29.85 |
-11:28:43.3 |
HIP 104459 |
31.48 |
| 2026-05-14 12:00 |
21:07:30.49 |
-11:28:15.1 |
HIP 104459 |
31.23 |
| 2026-05-15 00:00 |
21:07:31.04 |
-11:27:47.2 |
HIP 104459 |
31.01 |
| 2026-05-15 12:00 |
21:07:31.49 |
-11:27:19.7 |
HIP 104459 |
30.83 |
| 2026-05-16 00:00 |
21:07:31.84 |
-11:26:52.7 |
HIP 104459 |
30.67 |
| 2026-05-16 12:00 |
21:07:32.10 |
-11:26:26.0 |
HIP 104459 |
30.55 |
| 2026-05-17 00:00 |
21:07:32.26 |
-11:25:59.8 |
HIP 104459 |
30.45 |
| 2026-05-17 12:00 |
21:07:32.32 |
-11:25:34.0 |
HIP 104459 |
30.39 |
| 2026-05-18 00:00 |
21:07:32.29 |
-11:25:08.6 |
HIP 104459 |
30.35 |
| 2026-05-18 12:00 |
21:07:32.16 |
-11:24:43.6 |
HIP 104459 |
30.35 |
| 2026-05-19 00:00 |
21:07:31.93 |
-11:24:19.0 |
HIP 104459 |
30.37 |
| 2026-05-19 12:00 |
21:07:31.61 |
-11:23:54.9 |
HIP 104459 |
30.43 |
| 2026-05-20 00:00 |
21:07:31.19 |
-11:23:31.2 |
HIP 104459 |
30.51 |
| 2026-05-20 12:00 |
21:07:30.68 |
-11:23:07.8 |
HIP 104459 |
30.63 |
| 2026-05-21 00:00 |
21:07:30.06 |
-11:22:45.0 |
HIP 104459 |
30.77 |
| 2026-05-21 12:00 |
21:07:29.35 |
-11:22:22.5 |
HIP 104459 |
30.94 |
| 2026-05-22 00:00 |
21:07:28.55 |
-11:22:00.4 |
HIP 104459 |
31.14 |
| 2026-05-22 12:00 |
21:07:27.65 |
-11:21:38.8 |
HIP 104459 |
31.37 |
| 2026-05-23 00:00 |
21:07:26.65 |
-11:21:17.6 |
HIP 104459 |
31.62 |
| 2026-05-23 12:00 |
21:07:25.55 |
-11:20:56.8 |
HIP 104459 |
31.90 |
| 2026-05-24 00:00 |
21:07:24.36 |
-11:20:36.5 |
HIP 104459 |
32.21 |
| 2026-05-24 12:00 |
21:07:23.08 |
-11:20:16.5 |
HIP 104459 |
32.54 |
| 2026-05-25 00:00 |
21:07:21.70 |
-11:19:57.1 |
HIP 104459 |
32.90 |
| 2026-05-25 12:00 |
21:07:20.22 |
-11:19:38.0 |
HIP 104459 |
33.29 |
| 2026-05-26 00:00 |
21:07:18.64 |
-11:19:19.3 |
HIP 104459 |
33.70 |
| 2026-05-26 12:00 |
21:07:16.98 |
-11:19:01.1 |
HIP 104459 |
34.14 |
| 2026-05-27 00:00 |
21:07:15.21 |
-11:18:43.3 |
HIP 104459 |
34.60 |
| 2026-05-27 12:00 |
21:07:13.35 |
-11:18:26.0 |
HIP 104459 |
35.08 |
| 2026-05-28 00:00 |
21:07:11.40 |
-11:18:09.0 |
HIP 104459 |
35.59 |
| 2026-05-28 12:00 |
21:07:09.34 |
-11:17:52.5 |
HIP 104459 |
36.12 |
| 2026-05-29 00:00 |
21:07:07.20 |
-11:17:36.5 |
HIP 104459 |
36.68 |
| 2026-05-29 12:00 |
21:07:04.96 |
-11:17:20.8 |
HIP 104459 |
37.26 |
| 2026-05-30 00:00 |
21:07:02.62 |
-11:17:05.6 |
HIP 104459 |
37.86 |
| 2026-05-30 12:00 |
21:07:00.19 |
-11:16:50.9 |
HIP 104459 |
38.48 |
| 2026-05-31 00:00 |
21:06:57.67 |
-11:16:36.5 |
HIP 104459 |
39.13 |
| 2026-05-31 12:00 |
21:06:55.05 |
-11:16:22.6 |
HIP 104459 |
39.80 |
| 2026-06-01 00:00 |
21:06:52.34 |
-11:16:09.2 |
HIP 104459 |
40.49 |
| 2026-06-01 12:00 |
21:06:49.53 |
-11:15:56.1 |
HIP 104459 |
41.20 |
| 2026-06-02 00:00 |
21:06:46.63 |
-11:15:43.5 |
HIP 104132 |
41.28 |