| Parameter |
Value |
| Designation |
159P/LONEOS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-05-23T04:51:35.352000Z |
| Orbit solution date (soln_date, UTC) |
2024-02-25T22:13:01Z |
| Obs used |
880 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-04-25.0000000 |
| e |
0.38206863 |
| q (au) |
3.621139 |
| a (au) |
5.860099 |
| i (deg) |
23.462312 |
| Ω (om, deg) |
55.063749 |
| ω (w, deg) |
4.872824 |
| M (ma, deg) |
281.892773 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.771 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.771 |
| n |
2.000 |
| gf |
0.818 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
1.636 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
16:07:37.53 |
-28:46:59.5 |
HIP 78988 |
5.76 |
| 2026-07-29 12:00 |
16:07:33.46 |
-28:46:48.2 |
HIP 78988 |
5.54 |
| 2026-07-30 00:00 |
16:07:29.54 |
-28:46:37.2 |
HIP 78988 |
5.46 |
| 2026-07-30 12:00 |
16:07:25.75 |
-28:46:26.3 |
HIP 78988 |
5.52 |
| 2026-07-31 00:00 |
16:07:22.10 |
-28:46:15.7 |
HIP 78988 |
5.70 |
| 2026-07-31 12:00 |
16:07:18.59 |
-28:46:05.3 |
HIP 78988 |
5.98 |
| 2026-08-01 00:00 |
16:07:15.22 |
-28:45:55.1 |
HIP 78988 |
6.33 |
| 2026-08-01 12:00 |
16:07:11.99 |
-28:45:45.1 |
HIP 78988 |
6.74 |
| 2026-08-02 00:00 |
16:07:08.90 |
-28:45:35.4 |
HIP 78988 |
7.17 |
| 2026-08-02 12:00 |
16:07:05.95 |
-28:45:25.9 |
HIP 78988 |
7.63 |
| 2026-08-03 00:00 |
16:07:03.13 |
-28:45:16.7 |
HIP 78988 |
8.09 |
| 2026-08-03 12:00 |
16:07:00.46 |
-28:45:07.6 |
HIP 78988 |
8.56 |
| 2026-08-04 00:00 |
16:06:57.93 |
-28:44:58.9 |
HIP 78988 |
9.02 |
| 2026-08-04 12:00 |
16:06:55.54 |
-28:44:50.4 |
HIP 78988 |
9.47 |
| 2026-08-05 00:00 |
16:06:53.29 |
-28:44:42.1 |
HIP 78988 |
9.90 |
| 2026-08-05 12:00 |
16:06:51.18 |
-28:44:34.1 |
HIP 78988 |
10.31 |
| 2026-08-06 00:00 |
16:06:49.21 |
-28:44:26.4 |
HIP 78988 |
10.71 |
| 2026-08-06 12:00 |
16:06:47.38 |
-28:44:18.9 |
HIP 78988 |
11.09 |
| 2026-08-07 00:00 |
16:06:45.69 |
-28:44:11.7 |
HIP 78988 |
11.44 |
| 2026-08-07 12:00 |
16:06:44.15 |
-28:44:04.7 |
HIP 78988 |
11.77 |
| 2026-08-08 00:00 |
16:06:42.74 |
-28:43:58.0 |
HIP 78988 |
12.07 |
| 2026-08-08 12:00 |
16:06:41.48 |
-28:43:51.6 |
HIP 78988 |
12.35 |
| 2026-08-09 00:00 |
16:06:40.36 |
-28:43:45.5 |
HIP 78988 |
12.60 |
| 2026-08-09 12:00 |
16:06:39.38 |
-28:43:39.6 |
HIP 78988 |
12.83 |
| 2026-08-10 00:00 |
16:06:38.54 |
-28:43:34.1 |
HIP 78988 |
13.03 |
| 2026-08-10 12:00 |
16:06:37.85 |
-28:43:28.8 |
HIP 78988 |
13.20 |
| 2026-08-11 00:00 |
16:06:37.29 |
-28:43:23.8 |
HIP 78988 |
13.35 |
| 2026-08-11 12:00 |
16:06:36.88 |
-28:43:19.1 |
HIP 78988 |
13.47 |
| 2026-08-12 00:00 |
16:06:36.61 |
-28:43:14.7 |
HIP 78988 |
13.56 |
| 2026-08-12 12:00 |
16:06:36.48 |
-28:43:10.6 |
HIP 78988 |
13.63 |
| 2026-08-13 00:00 |
16:06:36.50 |
-28:43:06.7 |
HIP 78988 |
13.66 |
| 2026-08-13 12:00 |
16:06:36.65 |
-28:43:03.2 |
HIP 78988 |
13.68 |
| 2026-08-14 00:00 |
16:06:36.95 |
-28:43:00.0 |
HIP 78988 |
13.66 |
| 2026-08-14 12:00 |
16:06:37.39 |
-28:42:57.1 |
HIP 78988 |
13.62 |
| 2026-08-15 00:00 |
16:06:37.97 |
-28:42:54.5 |
HIP 78988 |
13.56 |
| 2026-08-15 12:00 |
16:06:38.69 |
-28:42:52.2 |
HIP 78988 |
13.46 |
| 2026-08-16 00:00 |
16:06:39.56 |
-28:42:50.2 |
HIP 78988 |
13.35 |
| 2026-08-16 12:00 |
16:06:40.56 |
-28:42:48.5 |
HIP 78988 |
13.21 |
| 2026-08-17 00:00 |
16:06:41.70 |
-28:42:47.2 |
HIP 78988 |
13.04 |
| 2026-08-17 12:00 |
16:06:42.99 |
-28:42:46.1 |
HIP 78988 |
12.86 |
| 2026-08-18 00:00 |
16:06:44.41 |
-28:42:45.4 |
HIP 78988 |
12.65 |
| 2026-08-18 12:00 |
16:06:45.98 |
-28:42:45.0 |
HIP 78988 |
12.42 |
| 2026-08-19 00:00 |
16:06:47.68 |
-28:42:44.8 |
HIP 78988 |
12.17 |