315P/LONEOS
| 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
$$
M_a = (14.142 + 2.004\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.142 |
| n |
2.004 |
| gf |
0.999 |
| gb |
-0.976 |
| k |
1.000 |
| δ90 |
8.336 |
| 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) |
| 2026-02-03 00:00 |
00:43:20.15 |
-09:22:34.4 |
HIP 3406 |
3.68 |
| 2026-02-03 12:00 |
00:43:37.47 |
-09:19:14.6 |
HIP 3406 |
3.62 |
| 2026-02-04 00:00 |
00:43:54.91 |
-09:15:54.6 |
HIP 3406 |
8.47 |
| 2026-02-04 12:00 |
00:44:12.46 |
-09:12:34.3 |
HIP 3406 |
13.80 |
| 2026-02-05 00:00 |
00:44:30.14 |
-09:09:13.7 |
HIP 3406 |
19.24 |
| 2026-02-05 12:00 |
00:44:47.93 |
-09:05:52.8 |
HIP 3406 |
24.73 |
| 2026-02-06 00:00 |
00:45:05.83 |
-09:02:31.7 |
HIP 3406 |
30.26 |
| 2026-02-06 12:00 |
00:45:23.85 |
-08:59:10.3 |
HIP 3554 |
33.50 |
| 2026-02-07 00:00 |
00:45:41.99 |
-08:55:48.7 |
HIP 3609 |
36.73 |
| 2026-02-07 12:00 |
00:46:00.24 |
-08:52:26.7 |
HIP 3609 |
32.70 |
| 2026-02-08 00:00 |
00:46:18.59 |
-08:49:04.6 |
HIP 3609 |
29.21 |
| 2026-02-08 12:00 |
00:46:37.07 |
-08:45:42.2 |
HIP 3609 |
26.48 |
| 2026-02-09 00:00 |
00:46:55.65 |
-08:42:19.6 |
HIP 3609 |
24.78 |
| 2026-02-09 12:00 |
00:47:14.34 |
-08:38:56.7 |
HIP 3609 |
24.34 |
| 2026-02-10 00:00 |
00:47:33.15 |
-08:35:33.6 |
HIP 3609 |
25.25 |
| 2026-02-10 12:00 |
00:47:52.06 |
-08:32:10.3 |
HIP 3609 |
27.38 |
| 2026-02-11 00:00 |
00:48:11.08 |
-08:28:46.7 |
HIP 3609 |
30.51 |
| 2026-02-11 12:00 |
00:48:30.20 |
-08:25:23.0 |
HIP 3609 |
34.36 |
| 2026-02-12 00:00 |
00:48:49.44 |
-08:21:59.0 |
HIP 3874 |
33.88 |
| 2026-02-12 12:00 |
00:49:08.78 |
-08:18:34.9 |
HIP 3874 |
29.00 |
| 2026-02-13 00:00 |
00:49:28.22 |
-08:15:10.5 |
HIP 3874 |
24.55 |
| 2026-02-13 12:00 |
00:49:47.77 |
-08:11:46.0 |
HIP 3874 |
20.83 |
| 2026-02-14 00:00 |
00:50:07.43 |
-08:08:21.3 |
HIP 3874 |
18.31 |
| 2026-02-14 12:00 |
00:50:27.18 |
-08:04:56.4 |
HIP 3874 |
17.54 |
| 2026-02-15 00:00 |
00:50:47.04 |
-08:01:31.4 |
HIP 4044 |
17.82 |
| 2026-02-15 12:00 |
00:51:07.00 |
-07:58:06.1 |
HIP 4044 |
16.01 |
| 2026-02-16 00:00 |
00:51:27.06 |
-07:54:40.7 |
HIP 4044 |
16.34 |
| 2026-02-16 12:00 |
00:51:47.22 |
-07:51:15.2 |
HIP 4044 |
18.71 |
| 2026-02-17 00:00 |
00:52:07.48 |
-07:47:49.5 |
HIP 4044 |
22.52 |
| 2026-02-17 12:00 |
00:52:27.83 |
-07:44:23.7 |
HIP 4044 |
27.18 |
| 2026-02-18 00:00 |
00:52:48.29 |
-07:40:57.7 |
HIP 4044 |
32.33 |
| 2026-02-18 12:00 |
00:53:08.84 |
-07:37:31.6 |
HIP 4276 |
33.00 |
| 2026-02-19 00:00 |
00:53:29.48 |
-07:34:05.4 |
HIP 4276 |
26.97 |
| 2026-02-19 12:00 |
00:53:50.22 |
-07:30:39.1 |
HIP 4276 |
21.01 |
| 2026-02-20 00:00 |
00:54:11.06 |
-07:27:12.6 |
HIP 4276 |
15.20 |
| 2026-02-20 12:00 |
00:54:31.99 |
-07:23:46.0 |
HIP 4276 |
9.88 |
| 2026-02-21 00:00 |
00:54:53.01 |
-07:20:19.4 |
HIP 4276 |
6.48 |
| 2026-02-21 12:00 |
00:55:14.12 |
-07:16:52.6 |
HIP 4276 |
8.04 |
| 2026-02-22 00:00 |
00:55:35.32 |
-07:13:25.8 |
HIP 4346 |
7.60 |
| 2026-02-22 12:00 |
00:55:56.61 |
-07:09:58.9 |
HIP 4346 |
11.40 |
| 2026-02-23 00:00 |
00:56:17.99 |
-07:06:31.9 |
HIP 4346 |
16.80 |
| 2026-02-23 12:00 |
00:56:39.46 |
-07:03:04.8 |
HIP 4403 |
20.02 |
| 2026-02-24 00:00 |
00:57:01.01 |
-06:59:37.7 |
HIP 4403 |
18.29 |