328P/LONEOS-Tucker
| 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) |
| 2026-02-03 00:00 |
09:53:24.90 |
+21:29:40.1 |
HIP 48472 |
38.03 |
| 2026-02-03 12:00 |
09:53:01.48 |
+21:30:46.2 |
HIP 48472 |
36.64 |
| 2026-02-04 00:00 |
09:52:38.01 |
+21:31:51.7 |
HIP 48472 |
36.06 |
| 2026-02-04 12:00 |
09:52:14.48 |
+21:32:56.5 |
HIP 48472 |
36.35 |
| 2026-02-05 00:00 |
09:51:50.91 |
+21:34:00.8 |
HIP 48218 |
36.48 |
| 2026-02-05 12:00 |
09:51:27.29 |
+21:35:04.4 |
HIP 48218 |
33.20 |
| 2026-02-06 00:00 |
09:51:03.63 |
+21:36:07.3 |
HIP 48218 |
30.59 |
| 2026-02-06 12:00 |
09:50:39.94 |
+21:37:09.5 |
HIP 48218 |
28.83 |
| 2026-02-07 00:00 |
09:50:16.22 |
+21:38:11.1 |
HIP 48218 |
28.08 |
| 2026-02-07 12:00 |
09:49:52.47 |
+21:39:11.9 |
HIP 48137 |
27.66 |
| 2026-02-08 00:00 |
09:49:28.69 |
+21:40:11.9 |
HIP 48137 |
24.24 |
| 2026-02-08 12:00 |
09:49:04.91 |
+21:41:11.2 |
HIP 48137 |
21.76 |
| 2026-02-09 00:00 |
09:48:41.10 |
+21:42:09.8 |
HIP 48137 |
20.57 |
| 2026-02-09 12:00 |
09:48:17.29 |
+21:43:07.5 |
HIP 48137 |
20.87 |
| 2026-02-10 00:00 |
09:47:53.47 |
+21:44:04.5 |
HIP 48137 |
22.63 |
| 2026-02-10 12:00 |
09:47:29.66 |
+21:45:00.6 |
HIP 48137 |
25.52 |
| 2026-02-11 00:00 |
09:47:05.85 |
+21:45:55.9 |
HIP 48137 |
29.23 |
| 2026-02-11 12:00 |
09:46:42.04 |
+21:46:50.3 |
HIP 48137 |
33.46 |
| 2026-02-12 00:00 |
09:46:18.25 |
+21:47:43.8 |
HIP 47740 |
37.01 |
| 2026-02-12 12:00 |
09:45:54.48 |
+21:48:36.5 |
HIP 47740 |
31.71 |
| 2026-02-13 00:00 |
09:45:30.73 |
+21:49:28.2 |
HIP 47740 |
26.55 |
| 2026-02-13 12:00 |
09:45:07.00 |
+21:50:19.0 |
HIP 47740 |
21.61 |
| 2026-02-14 00:00 |
09:44:43.31 |
+21:51:08.9 |
HIP 47740 |
17.08 |
| 2026-02-14 12:00 |
09:44:19.65 |
+21:51:57.8 |
HIP 47740 |
13.36 |
| 2026-02-15 00:00 |
09:43:56.03 |
+21:52:45.8 |
HIP 47740 |
11.28 |
| 2026-02-15 12:00 |
09:43:32.45 |
+21:53:32.8 |
HIP 47740 |
11.72 |
| 2026-02-16 00:00 |
09:43:08.92 |
+21:54:18.8 |
HIP 47740 |
14.45 |
| 2026-02-16 12:00 |
09:42:45.45 |
+21:55:03.8 |
HIP 47740 |
18.46 |
| 2026-02-17 00:00 |
09:42:22.03 |
+21:55:47.8 |
HIP 47578 |
21.77 |
| 2026-02-17 12:00 |
09:41:58.68 |
+21:56:30.8 |
HIP 47578 |
22.18 |
| 2026-02-18 00:00 |
09:41:35.39 |
+21:57:12.7 |
HIP 47578 |
23.85 |
| 2026-02-18 12:00 |
09:41:12.17 |
+21:57:53.5 |
HIP 47407 |
25.60 |
| 2026-02-19 00:00 |
09:40:49.02 |
+21:58:33.3 |
HIP 47407 |
20.66 |
| 2026-02-19 12:00 |
09:40:25.96 |
+21:59:12.1 |
HIP 47407 |
16.06 |
| 2026-02-20 00:00 |
09:40:02.97 |
+21:59:49.7 |
HIP 47407 |
12.15 |
| 2026-02-20 12:00 |
09:39:40.08 |
+22:00:26.2 |
HIP 47407 |
9.74 |
| 2026-02-21 00:00 |
09:39:17.27 |
+22:01:01.7 |
HIP 47407 |
9.98 |
| 2026-02-21 12:00 |
09:38:54.56 |
+22:01:36.0 |
HIP 47407 |
12.67 |
| 2026-02-22 00:00 |
09:38:31.95 |
+22:02:09.2 |
HIP 47407 |
16.65 |
| 2026-02-22 12:00 |
09:38:09.44 |
+22:02:41.2 |
HIP 47197 |
15.40 |
| 2026-02-23 00:00 |
09:37:47.04 |
+22:03:12.2 |
HIP 47197 |
11.17 |
| 2026-02-23 12:00 |
09:37:24.75 |
+22:03:41.9 |
HIP 47197 |
8.17 |
| 2026-02-24 00:00 |
09:37:02.58 |
+22:04:10.6 |
HIP 47197 |
7.89 |