| 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) |
| 2026-06-01 00:00 |
16:28:00.66 |
-29:10:59.2 |
HIP 80607 |
9.24 |
| 2026-06-01 12:00 |
16:27:46.40 |
-29:10:57.3 |
HIP 80607 |
7.31 |
| 2026-06-02 00:00 |
16:27:32.14 |
-29:10:55.1 |
HIP 80607 |
6.40 |
| 2026-06-02 12:00 |
16:27:17.90 |
-29:10:52.5 |
HIP 80607 |
6.92 |
| 2026-06-03 00:00 |
16:27:03.66 |
-29:10:49.6 |
HIP 80607 |
8.61 |
| 2026-06-03 12:00 |
16:26:49.43 |
-29:10:46.3 |
HIP 80607 |
10.94 |
| 2026-06-04 00:00 |
16:26:35.21 |
-29:10:42.7 |
HIP 80607 |
13.59 |
| 2026-06-04 12:00 |
16:26:21.00 |
-29:10:38.8 |
HIP 80478 |
16.20 |
| 2026-06-05 00:00 |
16:26:06.81 |
-29:10:34.4 |
HIP 80478 |
14.74 |
| 2026-06-05 12:00 |
16:25:52.64 |
-29:10:29.8 |
HIP 80478 |
13.84 |
| 2026-06-06 00:00 |
16:25:38.49 |
-29:10:24.8 |
HIP 80478 |
13.61 |
| 2026-06-06 12:00 |
16:25:24.35 |
-29:10:19.5 |
HIP 80478 |
14.07 |
| 2026-06-07 00:00 |
16:25:10.24 |
-29:10:13.9 |
HIP 80478 |
15.16 |
| 2026-06-07 12:00 |
16:24:56.15 |
-29:10:08.0 |
HIP 80478 |
16.76 |
| 2026-06-08 00:00 |
16:24:42.09 |
-29:10:01.7 |
HIP 80478 |
18.73 |
| 2026-06-08 12:00 |
16:24:28.05 |
-29:09:55.1 |
HIP 80478 |
20.96 |
| 2026-06-09 00:00 |
16:24:14.05 |
-29:09:48.2 |
HIP 80478 |
23.38 |
| 2026-06-09 12:00 |
16:24:00.07 |
-29:09:41.0 |
HIP 80478 |
25.93 |
| 2026-06-10 00:00 |
16:23:46.13 |
-29:09:33.6 |
HIP 80478 |
28.58 |
| 2026-06-10 12:00 |
16:23:32.22 |
-29:09:25.8 |
HIP 80478 |
31.29 |
| 2026-06-11 00:00 |
16:23:18.35 |
-29:09:17.7 |
HIP 80478 |
34.05 |
| 2026-06-11 12:00 |
16:23:04.51 |
-29:09:09.3 |
HIP 80478 |
36.85 |
| 2026-06-12 00:00 |
16:22:50.72 |
-29:09:00.6 |
HIP 80070 |
37.00 |
| 2026-06-12 12:00 |
16:22:36.96 |
-29:08:51.7 |
HIP 80070 |
34.72 |
| 2026-06-13 00:00 |
16:22:23.25 |
-29:08:42.5 |
HIP 80070 |
32.57 |
| 2026-06-13 12:00 |
16:22:09.59 |
-29:08:33.0 |
HIP 80070 |
30.57 |
| 2026-06-14 00:00 |
16:21:55.97 |
-29:08:23.3 |
HIP 80070 |
28.76 |
| 2026-06-14 12:00 |
16:21:42.40 |
-29:08:13.3 |
HIP 80070 |
27.15 |
| 2026-06-15 00:00 |
16:21:28.89 |
-29:08:03.0 |
HIP 80070 |
25.80 |
| 2026-06-15 12:00 |
16:21:15.42 |
-29:07:52.5 |
HIP 80070 |
24.74 |
| 2026-06-16 00:00 |
16:21:02.01 |
-29:07:41.7 |
HIP 80070 |
23.99 |
| 2026-06-16 12:00 |
16:20:48.66 |
-29:07:30.7 |
HIP 80070 |
23.60 |
| 2026-06-17 00:00 |
16:20:35.36 |
-29:07:19.5 |
HIP 80070 |
23.57 |
| 2026-06-17 12:00 |
16:20:22.12 |
-29:07:08.0 |
HIP 80070 |
23.89 |
| 2026-06-18 00:00 |
16:20:08.95 |
-29:06:56.3 |
HIP 80036 |
23.97 |
| 2026-06-18 12:00 |
16:19:55.83 |
-29:06:44.4 |
HIP 80036 |
24.12 |
| 2026-06-19 00:00 |
16:19:42.79 |
-29:06:32.3 |
HIP 80036 |
24.59 |
| 2026-06-19 12:00 |
16:19:29.80 |
-29:06:20.0 |
HIP 80036 |
25.38 |
| 2026-06-20 00:00 |
16:19:16.89 |
-29:06:07.5 |
HIP 80036 |
26.44 |
| 2026-06-20 12:00 |
16:19:04.04 |
-29:05:54.8 |
HIP 80036 |
27.73 |
| 2026-06-21 00:00 |
16:18:51.27 |
-29:05:41.9 |
HIP 80036 |
29.24 |
| 2026-06-21 12:00 |
16:18:38.57 |
-29:05:28.8 |
HIP 79881 |
29.01 |
| 2026-06-22 00:00 |
16:18:25.94 |
-29:05:15.5 |
HIP 79881 |
28.49 |