| 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) |
| 2026-09-20 00:00 |
16:13:10.59 |
-28:54:04.3 |
HIP 79520 |
11.13 |
| 2026-09-20 12:00 |
16:13:20.56 |
-28:54:25.5 |
HIP 79520 |
9.78 |
| 2026-09-21 00:00 |
16:13:30.63 |
-28:54:47.1 |
HIP 79520 |
8.78 |
| 2026-09-21 12:00 |
16:13:40.82 |
-28:55:09.0 |
HIP 79520 |
8.28 |
| 2026-09-22 00:00 |
16:13:51.12 |
-28:55:31.1 |
HIP 79520 |
8.38 |
| 2026-09-22 12:00 |
16:14:01.52 |
-28:55:53.6 |
HIP 79520 |
9.07 |
| 2026-09-23 00:00 |
16:14:12.03 |
-28:56:16.4 |
HIP 79520 |
10.27 |
| 2026-09-23 12:00 |
16:14:22.65 |
-28:56:39.5 |
HIP 79520 |
11.82 |
| 2026-09-24 00:00 |
16:14:33.38 |
-28:57:02.9 |
HIP 79520 |
13.63 |
| 2026-09-24 12:00 |
16:14:44.22 |
-28:57:26.6 |
HIP 79688 |
14.24 |
| 2026-09-25 00:00 |
16:14:55.16 |
-28:57:50.6 |
HIP 79688 |
11.82 |
| 2026-09-25 12:00 |
16:15:06.20 |
-28:58:14.8 |
HIP 79688 |
9.38 |
| 2026-09-26 00:00 |
16:15:17.35 |
-28:58:39.4 |
HIP 79688 |
6.92 |
| 2026-09-26 12:00 |
16:15:28.61 |
-28:59:04.3 |
HIP 79688 |
4.45 |
| 2026-09-27 00:00 |
16:15:39.97 |
-28:59:29.4 |
HIP 79688 |
2.04 |
| 2026-09-27 12:00 |
16:15:51.43 |
-28:59:54.9 |
HIP 79688 |
1.10 |
| 2026-09-28 00:00 |
16:16:03.00 |
-29:00:20.6 |
HIP 79688 |
3.36 |
| 2026-09-28 12:00 |
16:16:14.66 |
-29:00:46.6 |
HIP 79688 |
5.90 |
| 2026-09-29 00:00 |
16:16:26.43 |
-29:01:13.0 |
HIP 79688 |
8.49 |
| 2026-09-29 12:00 |
16:16:38.30 |
-29:01:39.5 |
HIP 79688 |
11.12 |
| 2026-09-30 00:00 |
16:16:50.27 |
-29:02:06.4 |
HIP 79688 |
13.76 |
| 2026-09-30 12:00 |
16:17:02.34 |
-29:02:33.6 |
HIP 79722 |
15.81 |
| 2026-10-01 00:00 |
16:17:14.51 |
-29:03:01.0 |
HIP 79722 |
17.35 |
| 2026-10-01 12:00 |
16:17:26.77 |
-29:03:28.7 |
HIP 79722 |
19.16 |
| 2026-10-02 00:00 |
16:17:39.14 |
-29:03:56.7 |
HIP 79722 |
21.18 |
| 2026-10-02 12:00 |
16:17:51.61 |
-29:04:25.0 |
HIP 79722 |
23.37 |
| 2026-10-03 00:00 |
16:18:04.17 |
-29:04:53.5 |
HIP 79722 |
25.69 |
| 2026-10-03 12:00 |
16:18:16.83 |
-29:05:22.4 |
HIP 79722 |
28.11 |
| 2026-10-04 00:00 |
16:18:29.58 |
-29:05:51.4 |
HIP 79881 |
29.14 |
| 2026-10-04 12:00 |
16:18:42.43 |
-29:06:20.8 |
HIP 79881 |
30.00 |
| 2026-10-05 00:00 |
16:18:55.38 |
-29:06:50.4 |
HIP 80036 |
29.59 |
| 2026-10-05 12:00 |
16:19:08.42 |
-29:07:20.3 |
HIP 80036 |
28.42 |
| 2026-10-06 00:00 |
16:19:21.55 |
-29:07:50.5 |
HIP 80036 |
27.50 |
| 2026-10-06 12:00 |
16:19:34.78 |
-29:08:20.9 |
HIP 80070 |
25.96 |
| 2026-10-07 00:00 |
16:19:48.10 |
-29:08:51.6 |
HIP 80070 |
24.18 |
| 2026-10-07 12:00 |
16:20:01.52 |
-29:09:22.5 |
HIP 80070 |
22.64 |
| 2026-10-08 00:00 |
16:20:15.02 |
-29:09:53.7 |
HIP 80070 |
21.39 |
| 2026-10-08 12:00 |
16:20:28.62 |
-29:10:25.1 |
HIP 80070 |
20.50 |
| 2026-10-09 00:00 |
16:20:42.31 |
-29:10:56.8 |
HIP 80070 |
20.03 |
| 2026-10-09 12:00 |
16:20:56.09 |
-29:11:28.8 |
HIP 80070 |
20.01 |
| 2026-10-10 00:00 |
16:21:09.95 |
-29:12:01.0 |
HIP 80070 |
20.45 |
| 2026-10-10 12:00 |
16:21:23.91 |
-29:12:33.5 |
HIP 80070 |
21.33 |
| 2026-10-11 00:00 |
16:21:37.95 |
-29:13:06.2 |
HIP 80070 |
22.62 |