| Parameter |
Value |
| Designation |
329P/LINEAR-Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-05T06:24:45.846720Z |
| Orbit solution date (soln_date, UTC) |
2026-06-09T11:12:47Z |
| Obs used |
688 |
| NEO |
- |
| M1 |
8.900 |
| K1 |
36.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-05-14.0000000 |
| e |
0.68010901 |
| q (au) |
1.659991 |
| a (au) |
5.189238 |
| i (deg) |
21.466997 |
| Ω (om, deg) |
88.791920 |
| ω (w, deg) |
342.314237 |
| M (ma, deg) |
282.019802 |
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) |
| 2026-09-20 00:00 |
20:47:50.72 |
-38:59:35.9 |
HIP 102497 |
21.50 |
| 2026-09-20 12:00 |
20:47:37.38 |
-38:59:11.0 |
HIP 102497 |
19.70 |
| 2026-09-21 00:00 |
20:47:24.35 |
-38:58:44.1 |
HIP 102497 |
18.18 |
| 2026-09-21 12:00 |
20:47:11.64 |
-38:58:15.1 |
HIP 102497 |
16.97 |
| 2026-09-22 00:00 |
20:46:59.26 |
-38:57:44.1 |
HIP 102497 |
16.13 |
| 2026-09-22 12:00 |
20:46:47.19 |
-38:57:11.1 |
HIP 102497 |
15.68 |
| 2026-09-23 00:00 |
20:46:35.45 |
-38:56:36.1 |
HIP 102497 |
15.64 |
| 2026-09-23 12:00 |
20:46:24.03 |
-38:55:59.1 |
HIP 102497 |
15.99 |
| 2026-09-24 00:00 |
20:46:12.93 |
-38:55:20.2 |
HIP 102497 |
16.67 |
| 2026-09-24 12:00 |
20:46:02.17 |
-38:54:39.3 |
HIP 102497 |
17.64 |
| 2026-09-25 00:00 |
20:45:51.73 |
-38:53:56.5 |
HIP 102497 |
18.83 |
| 2026-09-25 12:00 |
20:45:41.63 |
-38:53:11.8 |
HIP 102497 |
20.18 |
| 2026-09-26 00:00 |
20:45:31.86 |
-38:52:25.2 |
HIP 102497 |
21.66 |
| 2026-09-26 12:00 |
20:45:22.42 |
-38:51:36.8 |
HIP 102497 |
23.21 |
| 2026-09-27 00:00 |
20:45:13.31 |
-38:50:46.5 |
HIP 102501 |
24.41 |
| 2026-09-27 12:00 |
20:45:04.54 |
-38:49:54.4 |
HIP 102501 |
24.75 |
| 2026-09-28 00:00 |
20:44:56.11 |
-38:49:00.4 |
HIP 102501 |
25.15 |
| 2026-09-28 12:00 |
20:44:48.02 |
-38:48:04.7 |
HIP 102501 |
25.62 |
| 2026-09-29 00:00 |
20:44:40.26 |
-38:47:07.2 |
HIP 102501 |
26.14 |
| 2026-09-29 12:00 |
20:44:32.84 |
-38:46:07.9 |
HIP 102501 |
26.70 |
| 2026-09-30 00:00 |
20:44:25.77 |
-38:45:06.8 |
HIP 102184 |
27.11 |
| 2026-09-30 12:00 |
20:44:19.03 |
-38:44:04.0 |
HIP 102184 |
25.51 |
| 2026-10-01 00:00 |
20:44:12.64 |
-38:42:59.5 |
HIP 102184 |
23.97 |
| 2026-10-01 12:00 |
20:44:06.59 |
-38:41:53.3 |
HIP 102184 |
22.50 |
| 2026-10-02 00:00 |
20:44:00.89 |
-38:40:45.4 |
HIP 102184 |
21.11 |
| 2026-10-02 12:00 |
20:43:55.53 |
-38:39:35.9 |
HIP 102184 |
19.81 |
| 2026-10-03 00:00 |
20:43:50.51 |
-38:38:24.6 |
HIP 102184 |
18.61 |
| 2026-10-03 12:00 |
20:43:45.85 |
-38:37:11.8 |
HIP 102184 |
17.52 |
| 2026-10-04 00:00 |
20:43:41.53 |
-38:35:57.3 |
HIP 102184 |
16.57 |
| 2026-10-04 12:00 |
20:43:37.55 |
-38:34:41.2 |
HIP 102184 |
15.78 |
| 2026-10-05 00:00 |
20:43:33.93 |
-38:33:23.4 |
HIP 102184 |
15.16 |
| 2026-10-05 12:00 |
20:43:30.65 |
-38:32:04.1 |
HIP 102184 |
14.73 |
| 2026-10-06 00:00 |
20:43:27.73 |
-38:30:43.3 |
HIP 102184 |
14.51 |
| 2026-10-06 12:00 |
20:43:25.15 |
-38:29:20.9 |
HIP 102184 |
14.51 |
| 2026-10-07 00:00 |
20:43:22.93 |
-38:27:56.9 |
HIP 102184 |
14.74 |
| 2026-10-07 12:00 |
20:43:21.05 |
-38:26:31.4 |
HIP 102184 |
15.17 |
| 2026-10-08 00:00 |
20:43:19.53 |
-38:25:04.4 |
HIP 102184 |
15.79 |
| 2026-10-08 12:00 |
20:43:18.36 |
-38:23:35.9 |
HIP 102184 |
16.60 |
| 2026-10-09 00:00 |
20:43:17.53 |
-38:22:06.0 |
HIP 102184 |
17.55 |
| 2026-10-09 12:00 |
20:43:17.06 |
-38:20:34.6 |
HIP 102184 |
18.65 |
| 2026-10-10 00:00 |
20:43:16.94 |
-38:19:01.7 |
HIP 102184 |
19.86 |
| 2026-10-10 12:00 |
20:43:17.17 |
-38:17:27.4 |
HIP 102184 |
21.17 |
| 2026-10-11 00:00 |
20:43:17.75 |
-38:15:51.7 |
HIP 102184 |
22.57 |