| 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) |
| 2026-07-29 00:00 |
04:06:20.36 |
+21:57:53.8 |
HIP 19163 |
3.22 |
| 2026-07-29 12:00 |
04:06:29.80 |
+21:58:22.0 |
HIP 19163 |
1.40 |
| 2026-07-30 00:00 |
04:06:39.15 |
+21:58:50.0 |
HIP 19163 |
1.86 |
| 2026-07-30 12:00 |
04:06:48.42 |
+21:59:17.7 |
HIP 19163 |
3.83 |
| 2026-07-31 00:00 |
04:06:57.60 |
+21:59:45.2 |
HIP 19163 |
5.94 |
| 2026-07-31 12:00 |
04:07:06.70 |
+22:00:12.4 |
HIP 19163 |
8.07 |
| 2026-08-01 00:00 |
04:07:15.71 |
+22:00:39.4 |
HIP 19163 |
10.18 |
| 2026-08-01 12:00 |
04:07:24.63 |
+22:01:06.1 |
HIP 19299 |
11.50 |
| 2026-08-02 00:00 |
04:07:33.46 |
+22:01:32.6 |
HIP 19299 |
9.46 |
| 2026-08-02 12:00 |
04:07:42.21 |
+22:01:58.8 |
HIP 19299 |
7.46 |
| 2026-08-03 00:00 |
04:07:50.86 |
+22:02:24.8 |
HIP 19299 |
5.54 |
| 2026-08-03 12:00 |
04:07:59.43 |
+22:02:50.5 |
HIP 19299 |
3.77 |
| 2026-08-04 00:00 |
04:08:07.91 |
+22:03:16.0 |
HIP 19299 |
2.48 |
| 2026-08-04 12:00 |
04:08:16.29 |
+22:03:41.2 |
HIP 19299 |
2.46 |
| 2026-08-05 00:00 |
04:08:24.58 |
+22:04:06.2 |
HIP 19299 |
3.71 |
| 2026-08-05 12:00 |
04:08:32.78 |
+22:04:30.9 |
HIP 19299 |
5.38 |
| 2026-08-06 00:00 |
04:08:40.89 |
+22:04:55.4 |
HIP 19299 |
7.17 |
| 2026-08-06 12:00 |
04:08:48.91 |
+22:05:19.6 |
HIP 19299 |
9.00 |
| 2026-08-07 00:00 |
04:08:56.83 |
+22:05:43.5 |
HIP 19299 |
10.82 |
| 2026-08-07 12:00 |
04:09:04.65 |
+22:06:07.2 |
HIP 19299 |
12.64 |
| 2026-08-08 00:00 |
04:09:12.38 |
+22:06:30.7 |
HIP 19299 |
14.45 |
| 2026-08-08 12:00 |
04:09:20.02 |
+22:06:53.8 |
HIP 19299 |
16.24 |
| 2026-08-09 00:00 |
04:09:27.55 |
+22:07:16.7 |
HIP 19299 |
18.01 |
| 2026-08-09 12:00 |
04:09:34.99 |
+22:07:39.4 |
HIP 19299 |
19.77 |
| 2026-08-10 00:00 |
04:09:42.34 |
+22:08:01.8 |
HIP 19299 |
21.50 |
| 2026-08-10 12:00 |
04:09:49.58 |
+22:08:23.9 |
HIP 19558 |
21.88 |
| 2026-08-11 00:00 |
04:09:56.72 |
+22:08:45.8 |
HIP 19558 |
20.36 |
| 2026-08-11 12:00 |
04:10:03.77 |
+22:09:07.3 |
HIP 19558 |
18.88 |
| 2026-08-12 00:00 |
04:10:10.71 |
+22:09:28.7 |
HIP 19558 |
17.47 |
| 2026-08-12 12:00 |
04:10:17.55 |
+22:09:49.7 |
HIP 19558 |
16.11 |
| 2026-08-13 00:00 |
04:10:24.30 |
+22:10:10.5 |
HIP 19558 |
14.83 |
| 2026-08-13 12:00 |
04:10:30.93 |
+22:10:31.1 |
HIP 19558 |
13.63 |
| 2026-08-14 00:00 |
04:10:37.47 |
+22:10:51.3 |
HIP 19558 |
12.54 |
| 2026-08-14 12:00 |
04:10:43.90 |
+22:11:11.3 |
HIP 19558 |
11.56 |
| 2026-08-15 00:00 |
04:10:50.23 |
+22:11:31.0 |
HIP 19558 |
10.73 |
| 2026-08-15 12:00 |
04:10:56.46 |
+22:11:50.5 |
HIP 19558 |
10.06 |
| 2026-08-16 00:00 |
04:11:02.58 |
+22:12:09.6 |
HIP 19558 |
9.59 |
| 2026-08-16 12:00 |
04:11:08.60 |
+22:12:28.5 |
HIP 19558 |
9.33 |
| 2026-08-17 00:00 |
04:11:14.51 |
+22:12:47.2 |
HIP 19558 |
9.27 |
| 2026-08-17 12:00 |
04:11:20.31 |
+22:13:05.5 |
HIP 19558 |
9.43 |
| 2026-08-18 00:00 |
04:11:26.01 |
+22:13:23.6 |
HIP 19558 |
9.77 |
| 2026-08-18 12:00 |
04:11:31.60 |
+22:13:41.4 |
HIP 19558 |
10.27 |
| 2026-08-19 00:00 |
04:11:37.08 |
+22:13:58.9 |
HIP 19558 |
10.90 |