| Parameter |
Value |
| Designation |
346P/Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-08-21T13:41:12.261120Z |
| Orbit solution date (soln_date, UTC) |
2026-10-01T14:42:13Z |
| Obs used |
571 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
13.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-05-07.0000000 |
| e |
0.50428557 |
| q (au) |
2.221313 |
| a (au) |
4.481034 |
| i (deg) |
22.179435 |
| Ω (om, deg) |
102.545908 |
| ω (w, deg) |
335.786538 |
| M (ma, deg) |
178.761332 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.367 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.367 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
08:12:53.71 |
+18:32:10.4 |
HIP 40187 |
5.30 |
| 2026-09-25 12:00 |
08:13:50.00 |
+18:32:35.7 |
HIP 40187 |
18.58 |
| 2026-09-26 00:00 |
08:14:46.17 |
+18:33:01.0 |
HIP 40483 |
19.17 |
| 2026-09-26 12:00 |
08:15:42.20 |
+18:33:26.4 |
HIP 40483 |
9.06 |
| 2026-09-27 00:00 |
08:16:38.10 |
+18:33:51.8 |
HIP 40483 |
12.19 |
| 2026-09-27 12:00 |
08:17:33.87 |
+18:34:17.2 |
HIP 40483 |
23.77 |
| 2026-09-28 00:00 |
08:18:29.51 |
+18:34:42.8 |
HIP 40733 |
16.41 |
| 2026-09-28 12:00 |
08:19:25.02 |
+18:35:08.4 |
HIP 40733 |
17.79 |
| 2026-09-29 00:00 |
08:20:20.40 |
+18:35:34.1 |
HIP 40733 |
26.63 |
| 2026-09-29 12:00 |
08:21:15.63 |
+18:36:00.0 |
HIP 41117 |
33.97 |
| 2026-09-30 00:00 |
08:22:10.74 |
+18:36:26.1 |
HIP 41117 |
23.59 |
| 2026-09-30 12:00 |
08:23:05.70 |
+18:36:52.3 |
HIP 41117 |
17.36 |
| 2026-10-01 00:00 |
08:24:00.53 |
+18:37:18.7 |
HIP 41117 |
19.64 |
| 2026-10-01 12:00 |
08:24:55.22 |
+18:37:45.3 |
HIP 41117 |
28.41 |
| 2026-10-02 00:00 |
08:25:49.76 |
+18:38:12.1 |
HIP 41233 |
35.03 |
| 2026-10-02 12:00 |
08:26:44.17 |
+18:38:39.3 |
HIP 41440 |
36.90 |
| 2026-10-03 00:00 |
08:27:38.43 |
+18:39:06.6 |
HIP 41505 |
35.17 |
| 2026-10-03 12:00 |
08:28:32.54 |
+18:39:34.3 |
HIP 41727 |
32.79 |
| 2026-10-04 00:00 |
08:29:26.51 |
+18:40:02.3 |
HIP 41727 |
22.51 |
| 2026-10-04 12:00 |
08:30:20.34 |
+18:40:30.7 |
HIP 41727 |
16.27 |
| 2026-10-05 00:00 |
08:31:14.01 |
+18:40:59.4 |
HIP 41765 |
17.41 |
| 2026-10-05 12:00 |
08:32:07.53 |
+18:41:28.5 |
HIP 41833 |
18.84 |
| 2026-10-06 00:00 |
08:33:00.90 |
+18:41:58.0 |
HIP 41833 |
25.57 |
| 2026-10-06 12:00 |
08:33:54.12 |
+18:42:28.0 |
HIP 42058 |
19.85 |
| 2026-10-07 00:00 |
08:34:47.18 |
+18:42:58.4 |
HIP 42058 |
19.93 |
| 2026-10-07 12:00 |
08:35:40.08 |
+18:43:29.3 |
HIP 42247 |
18.67 |
| 2026-10-08 00:00 |
08:36:32.83 |
+18:44:00.6 |
HIP 42247 |
9.65 |
| 2026-10-08 12:00 |
08:37:25.42 |
+18:44:32.6 |
HIP 42284 |
7.84 |
| 2026-10-09 00:00 |
08:38:17.85 |
+18:45:05.0 |
HIP 42284 |
15.80 |
| 2026-10-09 12:00 |
08:39:10.11 |
+18:45:38.0 |
HIP 42487 |
14.69 |
| 2026-10-10 00:00 |
08:40:02.22 |
+18:46:11.7 |
HIP 42487 |
13.79 |
| 2026-10-10 12:00 |
08:40:54.15 |
+18:46:45.9 |
HIP 42705 |
20.39 |
| 2026-10-11 00:00 |
08:41:45.92 |
+18:47:20.8 |
HIP 42705 |
10.52 |
| 2026-10-11 12:00 |
08:42:37.53 |
+18:47:56.3 |
HIP 42705 |
10.29 |
| 2026-10-12 00:00 |
08:43:28.96 |
+18:48:32.5 |
HIP 42853 |
14.96 |
| 2026-10-12 12:00 |
08:44:20.23 |
+18:49:09.4 |
HIP 42853 |
14.09 |
| 2026-10-13 00:00 |
08:45:11.32 |
+18:49:47.1 |
HIP 42952 |
3.50 |
| 2026-10-13 12:00 |
08:46:02.24 |
+18:50:25.5 |
HIP 42970 |
7.83 |
| 2026-10-14 00:00 |
08:46:52.99 |
+18:51:04.7 |
HIP 43086 |
7.15 |
| 2026-10-14 12:00 |
08:47:43.56 |
+18:51:44.7 |
HIP 43223 |
10.60 |
| 2026-10-15 00:00 |
08:48:33.96 |
+18:52:25.5 |
HIP 43223 |
8.44 |
| 2026-10-15 12:00 |
08:49:24.18 |
+18:53:07.1 |
HIP 43223 |
17.73 |
| 2026-10-16 00:00 |
08:50:14.22 |
+18:53:49.6 |
HIP 43427 |
8.28 |