| 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) |
| 2026-03-26 00:00 |
09:20:09.15 |
+21:57:00.1 |
HIP 45844 |
19.01 |
| 2026-03-26 12:00 |
09:19:58.84 |
+21:56:18.4 |
HIP 45844 |
19.70 |
| 2026-03-27 00:00 |
09:19:48.77 |
+21:55:35.8 |
HIP 45844 |
20.61 |
| 2026-03-27 12:00 |
09:19:38.95 |
+21:54:52.1 |
HIP 45844 |
21.71 |
| 2026-03-28 00:00 |
09:19:29.36 |
+21:54:07.4 |
HIP 45844 |
22.95 |
| 2026-03-28 12:00 |
09:19:20.02 |
+21:53:21.6 |
HIP 45611 |
21.91 |
| 2026-03-29 00:00 |
09:19:10.92 |
+21:52:34.9 |
HIP 45611 |
19.67 |
| 2026-03-29 12:00 |
09:19:02.06 |
+21:51:47.2 |
HIP 45611 |
17.47 |
| 2026-03-30 00:00 |
09:18:53.43 |
+21:50:58.6 |
HIP 45611 |
15.32 |
| 2026-03-30 12:00 |
09:18:45.06 |
+21:50:08.9 |
HIP 45611 |
13.23 |
| 2026-03-31 00:00 |
09:18:36.92 |
+21:49:18.3 |
HIP 45611 |
11.20 |
| 2026-03-31 12:00 |
09:18:29.02 |
+21:48:26.7 |
HIP 45611 |
9.23 |
| 2026-04-01 00:00 |
09:18:21.36 |
+21:47:34.2 |
HIP 45611 |
7.36 |
| 2026-04-01 12:00 |
09:18:13.95 |
+21:46:40.7 |
HIP 45611 |
5.61 |
| 2026-04-02 00:00 |
09:18:06.77 |
+21:45:46.3 |
HIP 45611 |
4.10 |
| 2026-04-02 12:00 |
09:17:59.83 |
+21:44:50.9 |
HIP 45611 |
3.10 |
| 2026-04-03 00:00 |
09:17:53.14 |
+21:43:54.7 |
HIP 45611 |
3.08 |
| 2026-04-03 12:00 |
09:17:46.68 |
+21:42:57.5 |
HIP 45611 |
4.00 |
| 2026-04-04 00:00 |
09:17:40.46 |
+21:41:59.4 |
HIP 45611 |
5.36 |
| 2026-04-04 12:00 |
09:17:34.49 |
+21:41:00.4 |
HIP 45611 |
6.88 |
| 2026-04-05 00:00 |
09:17:28.75 |
+21:40:00.5 |
HIP 45611 |
8.45 |
| 2026-04-05 12:00 |
09:17:23.25 |
+21:38:59.7 |
HIP 45611 |
10.02 |
| 2026-04-06 00:00 |
09:17:17.99 |
+21:37:58.0 |
HIP 45611 |
11.59 |
| 2026-04-06 12:00 |
09:17:12.96 |
+21:36:55.5 |
HIP 45611 |
13.14 |
| 2026-04-07 00:00 |
09:17:08.18 |
+21:35:52.1 |
HIP 45611 |
14.67 |
| 2026-04-07 12:00 |
09:17:03.63 |
+21:34:47.8 |
HIP 45611 |
16.17 |
| 2026-04-08 00:00 |
09:16:59.31 |
+21:33:42.7 |
HIP 45611 |
17.65 |
| 2026-04-08 12:00 |
09:16:55.24 |
+21:32:36.7 |
HIP 45611 |
19.10 |
| 2026-04-09 00:00 |
09:16:51.39 |
+21:31:29.9 |
HIP 45473 |
19.04 |
| 2026-04-09 12:00 |
09:16:47.79 |
+21:30:22.2 |
HIP 45473 |
17.64 |
| 2026-04-10 00:00 |
09:16:44.42 |
+21:29:13.7 |
HIP 45473 |
16.26 |
| 2026-04-10 12:00 |
09:16:41.28 |
+21:28:04.4 |
HIP 45473 |
14.91 |
| 2026-04-11 00:00 |
09:16:38.38 |
+21:26:54.2 |
HIP 45473 |
13.58 |
| 2026-04-11 12:00 |
09:16:35.71 |
+21:25:43.3 |
HIP 45473 |
12.29 |
| 2026-04-12 00:00 |
09:16:33.27 |
+21:24:31.5 |
HIP 45473 |
11.04 |
| 2026-04-12 12:00 |
09:16:31.06 |
+21:23:18.9 |
HIP 45473 |
9.84 |
| 2026-04-13 00:00 |
09:16:29.09 |
+21:22:05.5 |
HIP 45473 |
8.71 |
| 2026-04-13 12:00 |
09:16:27.35 |
+21:20:51.4 |
HIP 45473 |
7.68 |
| 2026-04-14 00:00 |
09:16:25.83 |
+21:19:36.4 |
HIP 45473 |
6.78 |
| 2026-04-14 12:00 |
09:16:24.55 |
+21:18:20.7 |
HIP 45473 |
6.08 |
| 2026-04-15 00:00 |
09:16:23.50 |
+21:17:04.2 |
HIP 45473 |
5.64 |
| 2026-04-15 12:00 |
09:16:22.67 |
+21:15:46.9 |
HIP 45473 |
5.54 |
| 2026-04-16 00:00 |
09:16:22.07 |
+21:14:28.8 |
HIP 45473 |
5.80 |