| Parameter |
Value |
| Designation |
328P/LONEOS-Tucker |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-24T03:13:36.635520Z |
| Orbit solution date (soln_date, UTC) |
2024-12-26T20:12:47Z |
| Obs used |
609 |
| NEO |
- |
| M1 |
4.400 |
| K1 |
44.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-04-12.0000000 |
| e |
0.55125219 |
| q (au) |
1.886391 |
| a (au) |
4.203678 |
| i (deg) |
17.649254 |
| Ω (om, deg) |
341.601225 |
| ω (w, deg) |
30.622809 |
| M (ma, deg) |
330.709424 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.057 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.057 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2024-06-08 |
2024-12-02 |
+18.1269 |
-5.074 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
09:29:06.10 |
+18:31:30.8 |
HIP 46662 |
29.57 |
| 2026-06-01 12:00 |
09:29:21.53 |
+18:29:22.0 |
HIP 46662 |
25.33 |
| 2026-06-02 00:00 |
09:29:37.07 |
+18:27:12.8 |
HIP 46662 |
21.08 |
| 2026-06-02 12:00 |
09:29:52.73 |
+18:25:03.2 |
HIP 46662 |
16.80 |
| 2026-06-03 00:00 |
09:30:08.50 |
+18:22:53.2 |
HIP 46662 |
12.51 |
| 2026-06-03 12:00 |
09:30:24.38 |
+18:20:42.9 |
HIP 46662 |
8.22 |
| 2026-06-04 00:00 |
09:30:40.37 |
+18:18:32.2 |
HIP 46662 |
4.06 |
| 2026-06-04 12:00 |
09:30:56.47 |
+18:16:21.1 |
HIP 46662 |
1.93 |
| 2026-06-05 00:00 |
09:31:12.68 |
+18:14:09.6 |
HIP 46662 |
5.48 |
| 2026-06-05 12:00 |
09:31:29.00 |
+18:11:57.7 |
HIP 46662 |
9.80 |
| 2026-06-06 00:00 |
09:31:45.42 |
+18:09:45.5 |
HIP 46662 |
14.23 |
| 2026-06-06 12:00 |
09:32:01.95 |
+18:07:32.9 |
HIP 46662 |
18.72 |
| 2026-06-07 00:00 |
09:32:18.59 |
+18:05:20.0 |
HIP 46900 |
20.07 |
| 2026-06-07 12:00 |
09:32:35.33 |
+18:03:06.6 |
HIP 46900 |
18.63 |
| 2026-06-08 00:00 |
09:32:52.17 |
+18:00:52.9 |
HIP 46900 |
18.24 |
| 2026-06-08 12:00 |
09:33:09.11 |
+17:58:38.9 |
HIP 46900 |
18.97 |
| 2026-06-09 00:00 |
09:33:26.16 |
+17:56:24.5 |
HIP 46986 |
16.57 |
| 2026-06-09 12:00 |
09:33:43.31 |
+17:54:09.7 |
HIP 46986 |
13.02 |
| 2026-06-10 00:00 |
09:34:00.55 |
+17:51:54.5 |
HIP 46986 |
10.36 |
| 2026-06-10 12:00 |
09:34:17.90 |
+17:49:39.0 |
HIP 46986 |
9.43 |
| 2026-06-11 00:00 |
09:34:35.34 |
+17:47:23.2 |
HIP 46986 |
10.72 |
| 2026-06-11 12:00 |
09:34:52.87 |
+17:45:07.0 |
HIP 46986 |
13.63 |
| 2026-06-12 00:00 |
09:35:10.51 |
+17:42:50.4 |
HIP 46986 |
17.39 |
| 2026-06-12 12:00 |
09:35:28.24 |
+17:40:33.5 |
HIP 46986 |
21.58 |
| 2026-06-13 00:00 |
09:35:46.06 |
+17:38:16.3 |
HIP 47138 |
25.77 |
| 2026-06-13 12:00 |
09:36:03.97 |
+17:35:58.7 |
HIP 47138 |
22.50 |
| 2026-06-14 00:00 |
09:36:21.98 |
+17:33:40.7 |
HIP 47138 |
19.89 |
| 2026-06-14 12:00 |
09:36:40.07 |
+17:31:22.4 |
HIP 47138 |
18.23 |
| 2026-06-15 00:00 |
09:36:58.26 |
+17:29:03.8 |
HIP 47274 |
17.61 |
| 2026-06-15 12:00 |
09:37:16.53 |
+17:26:44.8 |
HIP 47274 |
12.68 |
| 2026-06-16 00:00 |
09:37:34.89 |
+17:24:25.5 |
HIP 47274 |
7.73 |
| 2026-06-16 12:00 |
09:37:53.34 |
+17:22:05.9 |
HIP 47274 |
2.79 |
| 2026-06-17 00:00 |
09:38:11.88 |
+17:19:46.0 |
HIP 47274 |
2.34 |
| 2026-06-17 12:00 |
09:38:30.49 |
+17:17:25.7 |
HIP 47274 |
7.31 |
| 2026-06-18 00:00 |
09:38:49.19 |
+17:15:05.1 |
HIP 47274 |
12.35 |
| 2026-06-18 12:00 |
09:39:07.98 |
+17:12:44.2 |
HIP 47375 |
15.35 |
| 2026-06-19 00:00 |
09:39:26.84 |
+17:10:22.9 |
HIP 47375 |
18.24 |
| 2026-06-19 12:00 |
09:39:45.78 |
+17:08:01.4 |
HIP 47455 |
13.58 |
| 2026-06-20 00:00 |
09:40:04.81 |
+17:05:39.6 |
HIP 47455 |
8.91 |
| 2026-06-20 12:00 |
09:40:23.91 |
+17:03:17.4 |
HIP 47455 |
5.16 |
| 2026-06-21 00:00 |
09:40:43.08 |
+17:00:54.9 |
HIP 47455 |
5.20 |
| 2026-06-21 12:00 |
09:41:02.34 |
+16:58:32.2 |
HIP 47455 |
9.00 |
| 2026-06-22 00:00 |
09:41:21.66 |
+16:56:09.1 |
HIP 47455 |
13.76 |