| Parameter |
Value |
| Designation |
315P/LONEOS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-12-07T07:13:42.444480Z |
| Orbit solution date (soln_date, UTC) |
2025-11-25T15:42:35Z |
| Obs used |
2369 |
| NEO |
- |
| M1 |
10.700 |
| K1 |
10.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-10-14.0000000 |
| e |
0.51637548 |
| q (au) |
2.429183 |
| a (au) |
5.022870 |
| i (deg) |
17.906607 |
| Ω (om, deg) |
69.600919 |
| ω (w, deg) |
66.946020 |
| M (ma, deg) |
227.329282 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.160 + 5.209\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.160 |
| n |
5.209 |
| gf |
0.964 |
| gb |
-0.977 |
| k |
1.000 |
| δ90 |
8.536 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
02:03:15.68 |
+01:23:17.3 |
HIP 9612 |
14.04 |
| 2026-05-12 12:00 |
02:03:43.49 |
+01:26:07.3 |
HIP 9612 |
10.78 |
| 2026-05-13 00:00 |
02:04:11.29 |
+01:28:56.8 |
HIP 9612 |
12.17 |
| 2026-05-13 12:00 |
02:04:39.10 |
+01:31:45.7 |
HIP 9612 |
17.10 |
| 2026-05-14 00:00 |
02:05:06.90 |
+01:34:34.2 |
HIP 9612 |
23.44 |
| 2026-05-14 12:00 |
02:05:34.69 |
+01:37:22.2 |
HIP 9856 |
21.35 |
| 2026-05-15 00:00 |
02:06:02.49 |
+01:40:09.6 |
HIP 9856 |
17.80 |
| 2026-05-15 12:00 |
02:06:30.27 |
+01:42:56.5 |
HIP 9856 |
17.02 |
| 2026-05-16 00:00 |
02:06:58.06 |
+01:45:42.9 |
HIP 9856 |
19.34 |
| 2026-05-16 12:00 |
02:07:25.83 |
+01:48:28.7 |
HIP 9986 |
19.31 |
| 2026-05-17 00:00 |
02:07:53.60 |
+01:51:14.0 |
HIP 9986 |
11.85 |
| 2026-05-17 12:00 |
02:08:21.37 |
+01:53:58.8 |
HIP 9986 |
4.39 |
| 2026-05-18 00:00 |
02:08:49.12 |
+01:56:43.0 |
HIP 9986 |
3.08 |
| 2026-05-18 12:00 |
02:09:16.86 |
+01:59:26.7 |
HIP 9986 |
10.52 |
| 2026-05-19 00:00 |
02:09:44.60 |
+02:02:09.8 |
HIP 9986 |
17.96 |
| 2026-05-19 12:00 |
02:10:12.32 |
+02:04:52.4 |
HIP 9986 |
25.40 |
| 2026-05-20 00:00 |
02:10:40.04 |
+02:07:34.4 |
HIP 10217 |
28.67 |
| 2026-05-20 12:00 |
02:11:07.74 |
+02:10:15.9 |
HIP 10217 |
29.54 |
| 2026-05-21 00:00 |
02:11:35.43 |
+02:12:56.8 |
HIP 10217 |
32.14 |
| 2026-05-21 12:00 |
02:12:03.11 |
+02:15:37.2 |
HIP 10342 |
26.83 |
| 2026-05-22 00:00 |
02:12:30.77 |
+02:18:16.9 |
HIP 10342 |
20.54 |
| 2026-05-22 12:00 |
02:12:58.42 |
+02:20:56.2 |
HIP 10342 |
15.28 |
| 2026-05-23 00:00 |
02:13:26.06 |
+02:23:34.8 |
HIP 10407 |
10.84 |
| 2026-05-23 12:00 |
02:13:53.68 |
+02:26:12.9 |
HIP 10407 |
3.53 |
| 2026-05-24 00:00 |
02:14:21.28 |
+02:28:50.4 |
HIP 10407 |
4.05 |
| 2026-05-24 12:00 |
02:14:48.87 |
+02:31:27.3 |
HIP 10407 |
11.36 |
| 2026-05-25 00:00 |
02:15:16.44 |
+02:34:03.7 |
HIP 10407 |
18.71 |
| 2026-05-25 12:00 |
02:15:44.00 |
+02:36:39.5 |
HIP 10631 |
16.70 |
| 2026-05-26 00:00 |
02:16:11.54 |
+02:39:14.7 |
HIP 10631 |
10.76 |
| 2026-05-26 12:00 |
02:16:39.06 |
+02:41:49.3 |
HIP 10631 |
7.78 |
| 2026-05-27 00:00 |
02:17:06.56 |
+02:44:23.3 |
HIP 10631 |
10.62 |
| 2026-05-27 12:00 |
02:17:34.04 |
+02:46:56.8 |
HIP 10631 |
16.50 |
| 2026-05-28 00:00 |
02:18:01.50 |
+02:49:29.6 |
HIP 10822 |
21.72 |
| 2026-05-28 12:00 |
02:18:28.94 |
+02:52:01.9 |
HIP 10838 |
15.18 |
| 2026-05-29 00:00 |
02:18:56.36 |
+02:54:33.6 |
HIP 10838 |
9.68 |
| 2026-05-29 12:00 |
02:19:23.76 |
+02:57:04.7 |
HIP 10838 |
7.95 |
| 2026-05-30 00:00 |
02:19:51.13 |
+02:59:35.1 |
HIP 10838 |
11.78 |
| 2026-05-30 12:00 |
02:20:18.49 |
+03:02:05.0 |
HIP 10838 |
17.89 |
| 2026-05-31 00:00 |
02:20:45.82 |
+03:04:34.3 |
HIP 10838 |
24.63 |
| 2026-05-31 12:00 |
02:21:13.13 |
+03:07:03.0 |
HIP 10838 |
31.59 |
| 2026-06-01 00:00 |
02:21:40.41 |
+03:09:31.1 |
HIP 10838 |
38.65 |
| 2026-06-01 12:00 |
02:22:07.67 |
+03:11:58.5 |
HIP 11117 |
38.28 |
| 2026-06-02 00:00 |
02:22:34.90 |
+03:14:25.4 |
HIP 11117 |
34.10 |