| 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) |
| 2026-07-29 00:00 |
10:07:42.75 |
+13:48:15.3 |
HIP 49589 |
8.74 |
| 2026-07-29 12:00 |
10:08:05.45 |
+13:45:35.7 |
HIP 49589 |
14.30 |
| 2026-07-30 00:00 |
10:08:28.17 |
+13:42:56.1 |
HIP 49589 |
20.19 |
| 2026-07-30 12:00 |
10:08:50.90 |
+13:40:16.3 |
HIP 49589 |
26.20 |
| 2026-07-31 00:00 |
10:09:13.66 |
+13:37:36.3 |
HIP 49820 |
30.12 |
| 2026-07-31 12:00 |
10:09:36.43 |
+13:34:56.3 |
HIP 49820 |
30.45 |
| 2026-08-01 00:00 |
10:09:59.21 |
+13:32:16.1 |
HIP 49929 |
26.44 |
| 2026-08-01 12:00 |
10:10:22.01 |
+13:29:35.8 |
HIP 49929 |
20.29 |
| 2026-08-02 00:00 |
10:10:44.83 |
+13:26:55.4 |
HIP 49929 |
14.14 |
| 2026-08-02 12:00 |
10:11:07.66 |
+13:24:14.9 |
HIP 49929 |
7.98 |
| 2026-08-03 00:00 |
10:11:30.51 |
+13:21:34.2 |
HIP 49929 |
1.89 |
| 2026-08-03 12:00 |
10:11:53.36 |
+13:18:53.5 |
HIP 49929 |
4.41 |
| 2026-08-04 00:00 |
10:12:16.24 |
+13:16:12.6 |
HIP 49938 |
10.43 |
| 2026-08-04 12:00 |
10:12:39.12 |
+13:13:31.6 |
HIP 49938 |
16.33 |
| 2026-08-05 00:00 |
10:13:02.02 |
+13:10:50.5 |
HIP 49938 |
22.39 |
| 2026-08-05 12:00 |
10:13:24.92 |
+13:08:09.3 |
HIP 50049 |
23.76 |
| 2026-08-06 00:00 |
10:13:47.84 |
+13:05:28.0 |
HIP 50049 |
23.03 |
| 2026-08-06 12:00 |
10:14:10.77 |
+13:02:46.6 |
HIP 50049 |
23.93 |
| 2026-08-07 00:00 |
10:14:33.71 |
+13:00:05.1 |
HIP 50085 |
25.77 |
| 2026-08-07 12:00 |
10:14:56.66 |
+12:57:23.5 |
HIP 50085 |
27.50 |
| 2026-08-08 00:00 |
10:15:19.61 |
+12:54:41.8 |
HIP 50357 |
23.63 |
| 2026-08-08 12:00 |
10:15:42.58 |
+12:52:00.0 |
HIP 50357 |
18.26 |
| 2026-08-09 00:00 |
10:16:05.55 |
+12:49:18.1 |
HIP 50357 |
13.61 |
| 2026-08-09 12:00 |
10:16:28.53 |
+12:46:36.1 |
HIP 50357 |
10.69 |
| 2026-08-10 00:00 |
10:16:51.51 |
+12:43:54.1 |
HIP 50357 |
10.98 |
| 2026-08-10 12:00 |
10:17:14.50 |
+12:41:12.0 |
HIP 50357 |
14.30 |
| 2026-08-11 00:00 |
10:17:37.50 |
+12:38:29.8 |
HIP 50473 |
10.79 |
| 2026-08-11 12:00 |
10:18:00.50 |
+12:35:47.5 |
HIP 50473 |
5.32 |
| 2026-08-12 00:00 |
10:18:23.50 |
+12:33:05.1 |
HIP 50473 |
4.22 |
| 2026-08-12 12:00 |
10:18:46.51 |
+12:30:22.7 |
HIP 50473 |
9.21 |
| 2026-08-13 00:00 |
10:19:09.52 |
+12:27:40.3 |
HIP 50473 |
15.16 |
| 2026-08-13 12:00 |
10:19:32.53 |
+12:24:57.7 |
HIP 50473 |
21.27 |
| 2026-08-14 00:00 |
10:19:55.54 |
+12:22:15.2 |
HIP 50473 |
27.44 |
| 2026-08-14 12:00 |
10:20:18.55 |
+12:19:32.5 |
HIP 50802 |
31.73 |
| 2026-08-15 00:00 |
10:20:41.56 |
+12:16:49.9 |
HIP 50802 |
25.53 |
| 2026-08-15 12:00 |
10:21:04.57 |
+12:14:07.1 |
HIP 50802 |
19.35 |
| 2026-08-16 00:00 |
10:21:27.57 |
+12:11:24.4 |
HIP 50802 |
13.24 |
| 2026-08-16 12:00 |
10:21:50.58 |
+12:08:41.6 |
HIP 50802 |
7.35 |
| 2026-08-17 00:00 |
10:22:13.58 |
+12:05:58.7 |
HIP 50802 |
3.28 |
| 2026-08-17 12:00 |
10:22:36.58 |
+12:03:15.9 |
HIP 50802 |
6.73 |
| 2026-08-18 00:00 |
10:22:59.57 |
+12:00:33.0 |
HIP 50802 |
12.56 |
| 2026-08-18 12:00 |
10:23:22.56 |
+11:57:50.1 |
HIP 50802 |
18.66 |
| 2026-08-19 00:00 |
10:23:45.54 |
+11:55:07.1 |
HIP 50802 |
24.83 |