| Parameter |
Value |
| Designation |
346P/Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2007-08-20T20:43:06.847680Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:55Z |
| Obs used |
553 |
| NEO |
- |
| M1 |
12.400 |
| K1 |
12.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-10-21.0000000 |
| e |
0.50406176 |
| q (au) |
2.222599 |
| a (au) |
4.481605 |
| i (deg) |
22.172168 |
| Ω (om, deg) |
102.556632 |
| ω (w, deg) |
335.762986 |
| M (ma, deg) |
158.127468 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.872 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.872 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-07-29 00:00 |
06:13:47.41 |
+16:35:15.1 |
HIP 29665 |
19.32 |
| 2026-07-29 12:00 |
06:14:52.14 |
+16:37:17.2 |
HIP 29665 |
7.59 |
| 2026-07-30 00:00 |
06:15:56.86 |
+16:39:17.9 |
HIP 29721 |
13.26 |
| 2026-07-30 12:00 |
06:17:01.55 |
+16:41:17.2 |
HIP 29721 |
24.93 |
| 2026-07-31 00:00 |
06:18:06.22 |
+16:43:15.1 |
HIP 30052 |
21.33 |
| 2026-07-31 12:00 |
06:19:10.86 |
+16:45:11.7 |
HIP 30052 |
11.40 |
| 2026-08-01 00:00 |
06:20:15.49 |
+16:47:06.8 |
HIP 30052 |
17.07 |
| 2026-08-01 12:00 |
06:21:20.09 |
+16:49:00.6 |
HIP 30293 |
24.71 |
| 2026-08-02 00:00 |
06:22:24.67 |
+16:50:53.0 |
HIP 30293 |
18.37 |
| 2026-08-02 12:00 |
06:23:29.22 |
+16:52:44.1 |
HIP 30364 |
22.33 |
| 2026-08-03 00:00 |
06:24:33.75 |
+16:54:33.8 |
HIP 30532 |
9.20 |
| 2026-08-03 12:00 |
06:25:38.25 |
+16:56:22.1 |
HIP 30532 |
8.45 |
| 2026-08-04 00:00 |
06:26:42.72 |
+16:58:09.1 |
HIP 30612 |
17.02 |
| 2026-08-04 12:00 |
06:27:47.16 |
+16:59:54.8 |
HIP 30941 |
26.39 |
| 2026-08-05 00:00 |
06:28:51.58 |
+17:01:39.1 |
HIP 30941 |
11.37 |
| 2026-08-05 12:00 |
06:29:55.96 |
+17:03:22.1 |
HIP 30941 |
6.49 |
| 2026-08-06 00:00 |
06:31:00.32 |
+17:05:03.8 |
HIP 31100 |
17.46 |
| 2026-08-06 12:00 |
06:32:04.64 |
+17:06:44.1 |
HIP 31236 |
17.57 |
| 2026-08-07 00:00 |
06:33:08.93 |
+17:08:23.2 |
HIP 31236 |
11.49 |
| 2026-08-07 12:00 |
06:34:13.18 |
+17:10:00.9 |
HIP 31236 |
20.79 |
| 2026-08-08 00:00 |
06:35:17.40 |
+17:11:37.4 |
HIP 31503 |
8.15 |
| 2026-08-08 12:00 |
06:36:21.59 |
+17:13:12.6 |
HIP 31503 |
7.28 |
| 2026-08-09 00:00 |
06:37:25.73 |
+17:14:46.4 |
HIP 31635 |
19.38 |
| 2026-08-09 12:00 |
06:38:29.84 |
+17:16:19.0 |
HIP 31635 |
25.66 |
| 2026-08-10 00:00 |
06:39:33.91 |
+17:17:50.4 |
HIP 31857 |
24.34 |
| 2026-08-10 12:00 |
06:40:37.94 |
+17:19:20.5 |
HIP 31950 |
19.12 |
| 2026-08-11 00:00 |
06:41:41.92 |
+17:20:49.3 |
HIP 32104 |
20.57 |
| 2026-08-11 12:00 |
06:42:45.87 |
+17:22:16.9 |
HIP 32104 |
17.23 |
| 2026-08-12 00:00 |
06:43:49.77 |
+17:23:43.3 |
HIP 32104 |
25.30 |
| 2026-08-12 12:00 |
06:44:53.62 |
+17:25:08.5 |
HIP 32465 |
23.89 |
| 2026-08-13 00:00 |
06:45:57.43 |
+17:26:32.4 |
HIP 32465 |
9.59 |
| 2026-08-13 12:00 |
06:47:01.19 |
+17:27:55.2 |
HIP 32465 |
8.97 |
| 2026-08-14 00:00 |
06:48:04.90 |
+17:29:16.7 |
HIP 32465 |
23.12 |
| 2026-08-14 12:00 |
06:49:08.56 |
+17:30:37.1 |
HIP 32783 |
14.58 |
| 2026-08-15 00:00 |
06:50:12.17 |
+17:31:56.3 |
HIP 32783 |
3.72 |
| 2026-08-15 12:00 |
06:51:15.73 |
+17:33:14.4 |
HIP 32946 |
10.14 |
| 2026-08-16 00:00 |
06:52:19.24 |
+17:34:31.3 |
HIP 32946 |
9.93 |
| 2026-08-16 12:00 |
06:53:22.70 |
+17:35:47.0 |
HIP 33203 |
19.05 |
| 2026-08-17 00:00 |
06:54:26.10 |
+17:37:01.6 |
HIP 33203 |
5.15 |
| 2026-08-17 12:00 |
06:55:29.44 |
+17:38:15.1 |
HIP 33203 |
12.22 |
| 2026-08-18 00:00 |
06:56:32.73 |
+17:39:27.5 |
HIP 33358 |
6.14 |
| 2026-08-18 12:00 |
06:57:35.96 |
+17:40:38.8 |
HIP 33493 |
13.58 |
| 2026-08-19 00:00 |
06:58:39.14 |
+17:41:49.0 |
HIP 33583 |
13.74 |