| 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) |
| 2026-05-12 00:00 |
09:20:37.04 |
+19:51:34.4 |
HIP 45886 |
27.35 |
| 2026-05-12 12:00 |
09:20:46.87 |
+19:49:43.5 |
HIP 45886 |
24.78 |
| 2026-05-13 00:00 |
09:20:56.86 |
+19:47:52.0 |
HIP 45886 |
22.30 |
| 2026-05-13 12:00 |
09:21:07.02 |
+19:46:00.1 |
HIP 45886 |
19.93 |
| 2026-05-14 00:00 |
09:21:17.33 |
+19:44:07.6 |
HIP 45886 |
17.76 |
| 2026-05-14 12:00 |
09:21:27.81 |
+19:42:14.6 |
HIP 45886 |
15.88 |
| 2026-05-15 00:00 |
09:21:38.45 |
+19:40:21.2 |
HIP 45886 |
14.44 |
| 2026-05-15 12:00 |
09:21:49.25 |
+19:38:27.2 |
HIP 45886 |
13.59 |
| 2026-05-16 00:00 |
09:22:00.20 |
+19:36:32.7 |
HIP 45886 |
13.47 |
| 2026-05-16 12:00 |
09:22:11.31 |
+19:34:37.8 |
HIP 45886 |
14.13 |
| 2026-05-17 00:00 |
09:22:22.58 |
+19:32:42.4 |
HIP 45886 |
15.48 |
| 2026-05-17 12:00 |
09:22:34.00 |
+19:30:46.4 |
HIP 45886 |
17.39 |
| 2026-05-18 00:00 |
09:22:45.57 |
+19:28:50.0 |
HIP 46104 |
19.17 |
| 2026-05-18 12:00 |
09:22:57.29 |
+19:26:53.2 |
HIP 46104 |
16.49 |
| 2026-05-19 00:00 |
09:23:09.16 |
+19:24:55.8 |
HIP 46104 |
14.08 |
| 2026-05-19 12:00 |
09:23:21.19 |
+19:22:58.0 |
HIP 46104 |
12.13 |
| 2026-05-20 00:00 |
09:23:33.35 |
+19:20:59.7 |
HIP 46104 |
10.93 |
| 2026-05-20 12:00 |
09:23:45.67 |
+19:19:01.0 |
HIP 46104 |
10.75 |
| 2026-05-21 00:00 |
09:23:58.13 |
+19:17:01.8 |
HIP 46104 |
11.69 |
| 2026-05-21 12:00 |
09:24:10.73 |
+19:15:02.2 |
HIP 46104 |
13.53 |
| 2026-05-22 00:00 |
09:24:23.47 |
+19:13:02.1 |
HIP 46104 |
15.99 |
| 2026-05-22 12:00 |
09:24:36.36 |
+19:11:01.5 |
HIP 46104 |
18.84 |
| 2026-05-23 00:00 |
09:24:49.38 |
+19:09:00.5 |
HIP 46104 |
21.95 |
| 2026-05-23 12:00 |
09:25:02.54 |
+19:06:59.1 |
HIP 46272 |
19.23 |
| 2026-05-24 00:00 |
09:25:15.84 |
+19:04:57.2 |
HIP 46272 |
15.55 |
| 2026-05-24 12:00 |
09:25:29.27 |
+19:02:55.0 |
HIP 46272 |
11.89 |
| 2026-05-25 00:00 |
09:25:42.83 |
+19:00:52.2 |
HIP 46272 |
8.29 |
| 2026-05-25 12:00 |
09:25:56.53 |
+18:58:49.1 |
HIP 46272 |
5.00 |
| 2026-05-26 00:00 |
09:26:10.36 |
+18:56:45.5 |
HIP 46272 |
3.27 |
| 2026-05-26 12:00 |
09:26:24.32 |
+18:54:41.5 |
HIP 46272 |
5.16 |
| 2026-05-27 00:00 |
09:26:38.41 |
+18:52:37.1 |
HIP 46272 |
8.57 |
| 2026-05-27 12:00 |
09:26:52.62 |
+18:50:32.3 |
HIP 46272 |
12.32 |
| 2026-05-28 00:00 |
09:27:06.97 |
+18:48:27.1 |
HIP 46272 |
16.20 |
| 2026-05-28 12:00 |
09:27:21.43 |
+18:46:21.5 |
HIP 46272 |
20.15 |
| 2026-05-29 00:00 |
09:27:36.02 |
+18:44:15.4 |
HIP 46272 |
24.15 |
| 2026-05-29 12:00 |
09:27:50.74 |
+18:42:09.0 |
HIP 46304 |
28.02 |
| 2026-05-30 00:00 |
09:28:05.57 |
+18:40:02.1 |
HIP 46357 |
29.70 |
| 2026-05-30 12:00 |
09:28:20.53 |
+18:37:54.9 |
HIP 46357 |
29.81 |
| 2026-05-31 00:00 |
09:28:35.60 |
+18:35:47.2 |
HIP 46357 |
30.50 |
| 2026-05-31 12:00 |
09:28:50.79 |
+18:33:39.2 |
HIP 46357 |
31.74 |
| 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 |