346P/Catalina
| 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) |
| 2026-02-03 00:00 |
00:41:22.31 |
-15:35:59.6 |
HIP 3305 |
18.12 |
| 2026-02-03 12:00 |
00:42:03.34 |
-15:29:05.8 |
HIP 3305 |
7.56 |
| 2026-02-04 00:00 |
00:42:44.51 |
-15:22:11.7 |
HIP 3305 |
8.77 |
| 2026-02-04 12:00 |
00:43:25.82 |
-15:15:17.2 |
HIP 3305 |
19.76 |
| 2026-02-05 00:00 |
00:44:07.26 |
-15:08:22.4 |
HIP 3503 |
17.10 |
| 2026-02-05 12:00 |
00:44:48.84 |
-15:01:27.2 |
HIP 3503 |
21.79 |
| 2026-02-06 00:00 |
00:45:30.55 |
-14:54:31.7 |
HIP 3503 |
30.90 |
| 2026-02-06 12:00 |
00:46:12.40 |
-14:47:35.8 |
HIP 3778 |
34.18 |
| 2026-02-07 00:00 |
00:46:54.38 |
-14:40:39.7 |
HIP 3778 |
24.34 |
| 2026-02-07 12:00 |
00:47:36.50 |
-14:33:43.2 |
HIP 3778 |
17.82 |
| 2026-02-08 00:00 |
00:48:18.75 |
-14:26:46.4 |
HIP 3778 |
18.61 |
| 2026-02-08 12:00 |
00:49:01.13 |
-14:19:49.3 |
HIP 3766 |
15.73 |
| 2026-02-09 00:00 |
00:49:43.64 |
-14:12:52.0 |
HIP 3766 |
20.48 |
| 2026-02-09 12:00 |
00:50:26.28 |
-14:05:54.3 |
HIP 4077 |
29.27 |
| 2026-02-10 00:00 |
00:51:09.05 |
-13:58:56.3 |
HIP 4077 |
17.15 |
| 2026-02-10 12:00 |
00:51:51.95 |
-13:51:58.1 |
HIP 4077 |
6.56 |
| 2026-02-11 00:00 |
00:52:34.98 |
-13:44:59.6 |
HIP 4077 |
10.31 |
| 2026-02-11 12:00 |
00:53:18.13 |
-13:38:00.9 |
HIP 4209 |
18.16 |
| 2026-02-12 00:00 |
00:54:01.42 |
-13:31:01.9 |
HIP 4209 |
24.63 |
| 2026-02-12 12:00 |
00:54:44.83 |
-13:24:02.6 |
HIP 4209 |
34.69 |
| 2026-02-13 00:00 |
00:55:28.37 |
-13:17:03.2 |
HIP 4333 |
43.91 |
| 2026-02-13 12:00 |
00:56:12.03 |
-13:10:03.5 |
HIP 4333 |
38.28 |
| 2026-02-14 00:00 |
00:56:55.82 |
-13:03:03.5 |
HIP 4333 |
36.45 |
| 2026-02-14 12:00 |
00:57:39.73 |
-12:56:03.4 |
HIP 4333 |
38.98 |
| 2026-02-15 00:00 |
00:58:23.76 |
-12:49:03.0 |
HIP 4494 |
36.27 |
| 2026-02-15 12:00 |
00:59:07.92 |
-12:42:02.5 |
HIP 4494 |
35.40 |
| 2026-02-16 00:00 |
00:59:52.20 |
-12:35:01.7 |
HIP 4707 |
25.09 |
| 2026-02-16 12:00 |
01:00:36.61 |
-12:28:00.8 |
HIP 4791 |
14.15 |
| 2026-02-17 00:00 |
01:01:21.13 |
-12:20:59.7 |
HIP 4791 |
4.39 |
| 2026-02-17 12:00 |
01:02:05.77 |
-12:13:58.5 |
HIP 4791 |
13.18 |
| 2026-02-18 00:00 |
01:02:50.54 |
-12:06:57.1 |
HIP 4791 |
25.81 |
| 2026-02-18 12:00 |
01:03:35.42 |
-11:59:55.5 |
HIP 4977 |
19.83 |
| 2026-02-19 00:00 |
01:04:20.42 |
-11:52:53.8 |
HIP 4977 |
15.09 |
| 2026-02-19 12:00 |
01:05:05.54 |
-11:45:52.0 |
HIP 4977 |
20.11 |
| 2026-02-20 00:00 |
01:05:50.77 |
-11:38:50.1 |
HIP 4977 |
30.43 |
| 2026-02-20 12:00 |
01:06:36.12 |
-11:31:48.0 |
HIP 5169 |
33.48 |
| 2026-02-21 00:00 |
01:07:21.59 |
-11:24:45.9 |
HIP 5169 |
31.59 |
| 2026-02-21 12:00 |
01:08:07.17 |
-11:17:43.6 |
HIP 5442 |
31.66 |
| 2026-02-22 00:00 |
01:08:52.87 |
-11:10:41.3 |
HIP 5442 |
31.83 |
| 2026-02-22 12:00 |
01:09:38.67 |
-11:03:38.9 |
HIP 5538 |
28.00 |
| 2026-02-23 00:00 |
01:10:24.59 |
-10:56:36.4 |
HIP 5625 |
27.30 |
| 2026-02-23 12:00 |
01:11:10.62 |
-10:49:33.9 |
HIP 5625 |
17.41 |
| 2026-02-24 00:00 |
01:11:56.76 |
-10:42:31.3 |
HIP 5625 |
14.66 |