| 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 |
0.817 |
| 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) |
| 2026-03-26 00:00 |
16:49:42.05 |
-28:18:31.3 |
HIP 82264 |
16.82 |
| 2026-03-26 12:00 |
16:49:40.21 |
-28:19:15.4 |
HIP 82264 |
16.16 |
| 2026-03-27 00:00 |
16:49:38.24 |
-28:19:59.3 |
HIP 82264 |
15.48 |
| 2026-03-27 12:00 |
16:49:36.11 |
-28:20:43.1 |
HIP 82264 |
14.80 |
| 2026-03-28 00:00 |
16:49:33.85 |
-28:21:26.6 |
HIP 82264 |
14.11 |
| 2026-03-28 12:00 |
16:49:31.44 |
-28:22:09.9 |
HIP 82264 |
13.41 |
| 2026-03-29 00:00 |
16:49:28.88 |
-28:22:53.0 |
HIP 82264 |
12.71 |
| 2026-03-29 12:00 |
16:49:26.18 |
-28:23:35.8 |
HIP 82264 |
12.00 |
| 2026-03-30 00:00 |
16:49:23.34 |
-28:24:18.5 |
HIP 82264 |
11.29 |
| 2026-03-30 12:00 |
16:49:20.36 |
-28:25:00.9 |
HIP 82264 |
10.59 |
| 2026-03-31 00:00 |
16:49:17.23 |
-28:25:43.1 |
HIP 82264 |
9.91 |
| 2026-03-31 12:00 |
16:49:13.96 |
-28:26:25.0 |
HIP 82264 |
9.24 |
| 2026-04-01 00:00 |
16:49:10.54 |
-28:27:06.8 |
HIP 82264 |
8.61 |
| 2026-04-01 12:00 |
16:49:06.99 |
-28:27:48.3 |
HIP 82264 |
8.03 |
| 2026-04-02 00:00 |
16:49:03.29 |
-28:28:29.6 |
HIP 82264 |
7.52 |
| 2026-04-02 12:00 |
16:48:59.45 |
-28:29:10.6 |
HIP 82264 |
7.11 |
| 2026-04-03 00:00 |
16:48:55.47 |
-28:29:51.4 |
HIP 82264 |
6.81 |
| 2026-04-03 12:00 |
16:48:51.34 |
-28:30:31.9 |
HIP 82264 |
6.67 |
| 2026-04-04 00:00 |
16:48:47.08 |
-28:31:12.2 |
HIP 82264 |
6.70 |
| 2026-04-04 12:00 |
16:48:42.67 |
-28:31:52.3 |
HIP 82264 |
6.91 |
| 2026-04-05 00:00 |
16:48:38.12 |
-28:32:32.1 |
HIP 82264 |
7.30 |
| 2026-04-05 12:00 |
16:48:33.43 |
-28:33:11.6 |
HIP 82264 |
7.84 |
| 2026-04-06 00:00 |
16:48:28.60 |
-28:33:50.9 |
HIP 82264 |
8.53 |
| 2026-04-06 12:00 |
16:48:23.63 |
-28:34:29.9 |
HIP 82264 |
9.34 |
| 2026-04-07 00:00 |
16:48:18.52 |
-28:35:08.7 |
HIP 82264 |
10.24 |
| 2026-04-07 12:00 |
16:48:13.27 |
-28:35:47.2 |
HIP 82264 |
11.23 |
| 2026-04-08 00:00 |
16:48:07.88 |
-28:36:25.4 |
HIP 82264 |
12.29 |
| 2026-04-08 12:00 |
16:48:02.35 |
-28:37:03.4 |
HIP 82264 |
13.41 |
| 2026-04-09 00:00 |
16:47:56.68 |
-28:37:41.1 |
HIP 82264 |
14.59 |
| 2026-04-09 12:00 |
16:47:50.88 |
-28:38:18.5 |
HIP 82229 |
15.55 |
| 2026-04-10 00:00 |
16:47:44.93 |
-28:38:55.7 |
HIP 82229 |
16.34 |
| 2026-04-10 12:00 |
16:47:38.85 |
-28:39:32.5 |
HIP 82229 |
17.21 |
| 2026-04-11 00:00 |
16:47:32.63 |
-28:40:09.1 |
HIP 82228 |
18.02 |
| 2026-04-11 12:00 |
16:47:26.28 |
-28:40:45.4 |
HIP 82228 |
17.90 |
| 2026-04-12 00:00 |
16:47:19.79 |
-28:41:21.4 |
HIP 82228 |
17.93 |
| 2026-04-12 12:00 |
16:47:13.16 |
-28:41:57.1 |
HIP 82228 |
18.10 |
| 2026-04-13 00:00 |
16:47:06.40 |
-28:42:32.5 |
HIP 82228 |
18.43 |
| 2026-04-13 12:00 |
16:46:59.51 |
-28:43:07.6 |
HIP 82228 |
18.92 |
| 2026-04-14 00:00 |
16:46:52.48 |
-28:43:42.4 |
HIP 82228 |
19.55 |
| 2026-04-14 12:00 |
16:46:45.32 |
-28:44:16.9 |
HIP 82228 |
20.32 |
| 2026-04-15 00:00 |
16:46:38.02 |
-28:44:51.1 |
HIP 82228 |
21.22 |
| 2026-04-15 12:00 |
16:46:30.59 |
-28:45:25.0 |
HIP 82228 |
22.24 |
| 2026-04-16 00:00 |
16:46:23.04 |
-28:45:58.5 |
HIP 82228 |
23.37 |