| Parameter |
Value |
| Designation |
329P/LINEAR-Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-05T06:20:59.193600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:25Z |
| Obs used |
685 |
| NEO |
- |
| M1 |
8.900 |
| K1 |
36.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-05-10.0000000 |
| e |
0.68010907 |
| q (au) |
1.660001 |
| a (au) |
5.189273 |
| i (deg) |
21.466984 |
| Ω (om, deg) |
88.791911 |
| ω (w, deg) |
342.313801 |
| M (ma, deg) |
281.687284 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.015 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.015 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.547 |
| k |
0.800 |
| 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) |
| 2026-03-26 00:00 |
21:05:38.66 |
-28:14:31.6 |
HIP 104226 |
21.25 |
| 2026-03-26 12:00 |
21:06:03.84 |
-28:14:14.2 |
HIP 104226 |
17.27 |
| 2026-03-27 00:00 |
21:06:28.94 |
-28:13:57.5 |
HIP 104226 |
14.37 |
| 2026-03-27 12:00 |
21:06:53.96 |
-28:13:41.4 |
HIP 104226 |
13.26 |
| 2026-03-28 00:00 |
21:07:18.90 |
-28:13:25.9 |
HIP 104226 |
14.32 |
| 2026-03-28 12:00 |
21:07:43.76 |
-28:13:11.2 |
HIP 104226 |
17.16 |
| 2026-03-29 00:00 |
21:08:08.54 |
-28:12:57.1 |
HIP 104398 |
19.14 |
| 2026-03-29 12:00 |
21:08:33.24 |
-28:12:43.6 |
HIP 104398 |
16.85 |
| 2026-03-30 00:00 |
21:08:57.86 |
-28:12:30.9 |
HIP 104398 |
16.13 |
| 2026-03-30 12:00 |
21:09:22.39 |
-28:12:18.9 |
HIP 104398 |
17.16 |
| 2026-03-31 00:00 |
21:09:46.84 |
-28:12:07.5 |
HIP 104398 |
19.66 |
| 2026-03-31 12:00 |
21:10:11.20 |
-28:11:56.8 |
HIP 104532 |
17.96 |
| 2026-04-01 00:00 |
21:10:35.48 |
-28:11:46.9 |
HIP 104532 |
17.73 |
| 2026-04-01 12:00 |
21:10:59.67 |
-28:11:37.7 |
HIP 104532 |
19.04 |
| 2026-04-02 00:00 |
21:11:23.77 |
-28:11:29.2 |
HIP 104683 |
20.90 |
| 2026-04-02 12:00 |
21:11:47.78 |
-28:11:21.4 |
HIP 104683 |
18.30 |
| 2026-04-03 00:00 |
21:12:11.71 |
-28:11:14.3 |
HIP 104683 |
17.02 |
| 2026-04-03 12:00 |
21:12:35.55 |
-28:11:08.1 |
HIP 104683 |
17.33 |
| 2026-04-04 00:00 |
21:12:59.30 |
-28:11:02.5 |
HIP 104683 |
19.14 |
| 2026-04-04 12:00 |
21:13:22.95 |
-28:10:57.7 |
HIP 104683 |
22.07 |
| 2026-04-05 00:00 |
21:13:46.51 |
-28:10:53.7 |
HIP 104683 |
25.73 |
| 2026-04-05 12:00 |
21:14:09.98 |
-28:10:50.5 |
HIP 105025 |
29.64 |
| 2026-04-06 00:00 |
21:14:33.36 |
-28:10:48.1 |
HIP 105025 |
24.61 |
| 2026-04-06 12:00 |
21:14:56.64 |
-28:10:46.4 |
HIP 105025 |
19.64 |
| 2026-04-07 00:00 |
21:15:19.83 |
-28:10:45.6 |
HIP 105025 |
14.81 |
| 2026-04-07 12:00 |
21:15:42.92 |
-28:10:45.5 |
HIP 105025 |
10.26 |
| 2026-04-08 00:00 |
21:16:05.91 |
-28:10:46.3 |
HIP 105025 |
6.55 |
| 2026-04-08 12:00 |
21:16:28.81 |
-28:10:47.9 |
HIP 105025 |
5.62 |
| 2026-04-09 00:00 |
21:16:51.60 |
-28:10:50.3 |
HIP 105025 |
8.41 |
| 2026-04-09 12:00 |
21:17:14.29 |
-28:10:53.6 |
HIP 105025 |
12.64 |
| 2026-04-10 00:00 |
21:17:36.89 |
-28:10:57.8 |
HIP 105025 |
17.25 |
| 2026-04-10 12:00 |
21:17:59.38 |
-28:11:02.8 |
HIP 105025 |
22.00 |
| 2026-04-11 00:00 |
21:18:21.77 |
-28:11:08.6 |
HIP 105025 |
26.80 |
| 2026-04-11 12:00 |
21:18:44.05 |
-28:11:15.4 |
HIP 105025 |
31.62 |
| 2026-04-12 00:00 |
21:19:06.23 |
-28:11:23.0 |
HIP 105228 |
34.66 |
| 2026-04-12 12:00 |
21:19:28.30 |
-28:11:31.5 |
HIP 105228 |
35.22 |
| 2026-04-13 00:00 |
21:19:50.26 |
-28:11:40.9 |
HIP 105418 |
32.85 |
| 2026-04-13 12:00 |
21:20:12.12 |
-28:11:51.2 |
HIP 105418 |
30.72 |
| 2026-04-14 00:00 |
21:20:33.86 |
-28:12:02.5 |
HIP 105418 |
29.26 |
| 2026-04-14 12:00 |
21:20:55.50 |
-28:12:14.6 |
HIP 105418 |
28.56 |
| 2026-04-15 00:00 |
21:21:17.02 |
-28:12:27.8 |
HIP 105578 |
24.29 |
| 2026-04-15 12:00 |
21:21:38.43 |
-28:12:41.8 |
HIP 105578 |
19.86 |
| 2026-04-16 00:00 |
21:21:59.73 |
-28:12:56.8 |
HIP 105578 |
15.64 |