376P/LONEOS
| Parameter |
Value |
| Designation |
376P/LONEOS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-08-15T01:24:58.645440Z |
| Orbit solution date (soln_date, UTC) |
2024-09-11T13:42:35Z |
| Obs used |
478 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
14.750 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2019-04-22T11:32:11.097600Z |
| Discovery magnitude (MPC) |
18.04 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-09-26.0000000 |
| e |
0.51484893 |
| q (au) |
2.841707 |
| a (au) |
5.857366 |
| i (deg) |
1.188860 |
| Ω (om, deg) |
315.159432 |
| ω (w, deg) |
285.484686 |
| M (ma, deg) |
129.871457 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.056 + 5.725\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.056 |
| n |
5.725 |
| gf |
0.999 |
| gb |
-0.879 |
| 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 |
| 2018-01-16 |
2019-03-12 |
+7.8827 |
-3.835 |
| 2019-03-12 |
2021-09-04 |
-3.5096 |
+2.097 |
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 |
02:55:27.95 |
+17:56:06.7 |
HIP 13600 |
3.82 |
| 2026-02-03 12:00 |
02:55:30.57 |
+17:56:13.4 |
HIP 13600 |
4.37 |
| 2026-02-04 00:00 |
02:55:33.31 |
+17:56:20.6 |
HIP 13600 |
4.96 |
| 2026-02-04 12:00 |
02:55:36.17 |
+17:56:28.3 |
HIP 13600 |
5.60 |
| 2026-02-05 00:00 |
02:55:39.14 |
+17:56:36.4 |
HIP 13600 |
6.27 |
| 2026-02-05 12:00 |
02:55:42.23 |
+17:56:45.1 |
HIP 13600 |
6.99 |
| 2026-02-06 00:00 |
02:55:45.43 |
+17:56:54.3 |
HIP 13600 |
7.74 |
| 2026-02-06 12:00 |
02:55:48.75 |
+17:57:04.0 |
HIP 13600 |
8.52 |
| 2026-02-07 00:00 |
02:55:52.18 |
+17:57:14.2 |
HIP 13702 |
9.06 |
| 2026-02-07 12:00 |
02:55:55.73 |
+17:57:24.9 |
HIP 13702 |
8.23 |
| 2026-02-08 00:00 |
02:55:59.40 |
+17:57:36.1 |
HIP 13702 |
7.39 |
| 2026-02-08 12:00 |
02:56:03.17 |
+17:57:47.7 |
HIP 13702 |
6.52 |
| 2026-02-09 00:00 |
02:56:07.06 |
+17:57:59.9 |
HIP 13702 |
5.65 |
| 2026-02-09 12:00 |
02:56:11.06 |
+17:58:12.5 |
HIP 13702 |
4.78 |
| 2026-02-10 00:00 |
02:56:15.18 |
+17:58:25.6 |
HIP 13702 |
3.94 |
| 2026-02-10 12:00 |
02:56:19.41 |
+17:58:39.3 |
HIP 13702 |
3.18 |
| 2026-02-11 00:00 |
02:56:23.75 |
+17:58:53.3 |
HIP 13702 |
2.58 |
| 2026-02-11 12:00 |
02:56:28.20 |
+17:59:07.9 |
HIP 13702 |
2.35 |
| 2026-02-12 00:00 |
02:56:32.77 |
+17:59:23.0 |
HIP 13702 |
2.60 |
| 2026-02-12 12:00 |
02:56:37.44 |
+17:59:38.5 |
HIP 13702 |
3.25 |
| 2026-02-13 00:00 |
02:56:42.23 |
+17:59:54.5 |
HIP 13702 |
4.15 |
| 2026-02-13 12:00 |
02:56:47.12 |
+18:00:11.0 |
HIP 13702 |
5.18 |
| 2026-02-14 00:00 |
02:56:52.13 |
+18:00:27.9 |
HIP 13702 |
6.29 |
| 2026-02-14 12:00 |
02:56:57.24 |
+18:00:45.4 |
HIP 13702 |
7.46 |
| 2026-02-15 00:00 |
02:57:02.47 |
+18:01:03.3 |
HIP 13702 |
8.68 |
| 2026-02-15 12:00 |
02:57:07.80 |
+18:01:21.6 |
HIP 13702 |
9.94 |
| 2026-02-16 00:00 |
02:57:13.24 |
+18:01:40.4 |
HIP 13702 |
11.24 |
| 2026-02-16 12:00 |
02:57:18.79 |
+18:01:59.7 |
HIP 13702 |
12.57 |
| 2026-02-17 00:00 |
02:57:24.44 |
+18:02:19.4 |
HIP 13702 |
13.93 |
| 2026-02-17 12:00 |
02:57:30.21 |
+18:02:39.6 |
HIP 13824 |
15.04 |
| 2026-02-18 00:00 |
02:57:36.08 |
+18:03:00.3 |
HIP 13824 |
14.88 |
| 2026-02-18 12:00 |
02:57:42.05 |
+18:03:21.3 |
HIP 13824 |
14.86 |
| 2026-02-19 00:00 |
02:57:48.13 |
+18:03:42.9 |
HIP 13824 |
14.99 |
| 2026-02-19 12:00 |
02:57:54.31 |
+18:04:04.9 |
HIP 13824 |
15.28 |
| 2026-02-20 00:00 |
02:58:00.60 |
+18:04:27.3 |
HIP 13824 |
15.71 |
| 2026-02-20 12:00 |
02:58:07.00 |
+18:04:50.1 |
HIP 13824 |
16.29 |
| 2026-02-21 00:00 |
02:58:13.49 |
+18:05:13.4 |
HIP 13824 |
17.01 |
| 2026-02-21 12:00 |
02:58:20.09 |
+18:05:37.2 |
HIP 13824 |
17.86 |
| 2026-02-22 00:00 |
02:58:26.79 |
+18:06:01.3 |
HIP 13824 |
18.82 |
| 2026-02-22 12:00 |
02:58:33.59 |
+18:06:25.9 |
HIP 13824 |
19.89 |
| 2026-02-23 00:00 |
02:58:40.49 |
+18:06:50.9 |
HIP 13824 |
21.06 |
| 2026-02-23 12:00 |
02:58:47.49 |
+18:07:16.3 |
HIP 13824 |
22.32 |
| 2026-02-24 00:00 |
02:58:54.59 |
+18:07:42.2 |
HIP 13824 |
23.65 |