| Parameter |
Value |
| Designation |
201P/LONEOS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-01-14T08:01:42.346560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:27:52Z |
| Obs used |
865 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
15.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-05-08.0000000 |
| e |
0.61286098 |
| q (au) |
1.339984 |
| a (au) |
3.461247 |
| i (deg) |
7.036519 |
| Ω (om, deg) |
35.285668 |
| ω (w, deg) |
24.953960 |
| M (ma, deg) |
209.799179 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.450 + 5.551\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.450 |
| n |
5.551 |
| gf |
1.000 |
| gb |
-0.662 |
| k |
0.800 |
| δ90 |
10.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2014-07-08 |
2014-10-02 |
+4.5177 |
-1.113 |
| 2014-10-02 |
2015-01-13 |
-5.8786 |
+1.035 |
| 2015-01-16 |
2015-04-16 |
+15.3215 |
-2.697 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
19:46:58.31 |
-28:29:41.5 |
HIP 97401 |
10.97 |
| 2026-06-01 12:00 |
19:46:46.04 |
-28:31:04.3 |
HIP 97401 |
13.76 |
| 2026-06-02 00:00 |
19:46:33.45 |
-28:32:27.6 |
HIP 97401 |
16.70 |
| 2026-06-02 12:00 |
19:46:20.54 |
-28:33:51.4 |
HIP 97401 |
19.76 |
| 2026-06-03 00:00 |
19:46:07.31 |
-28:35:15.7 |
HIP 97401 |
22.91 |
| 2026-06-03 12:00 |
19:45:53.76 |
-28:36:40.4 |
HIP 97401 |
26.15 |
| 2026-06-04 00:00 |
19:45:39.89 |
-28:38:05.6 |
HIP 97191 |
29.32 |
| 2026-06-04 12:00 |
19:45:25.70 |
-28:39:31.3 |
HIP 97191 |
27.43 |
| 2026-06-05 00:00 |
19:45:11.19 |
-28:40:57.4 |
HIP 97191 |
25.86 |
| 2026-06-05 12:00 |
19:44:56.36 |
-28:42:23.8 |
HIP 97191 |
24.69 |
| 2026-06-06 00:00 |
19:44:41.21 |
-28:43:50.7 |
HIP 97191 |
24.00 |
| 2026-06-06 12:00 |
19:44:25.74 |
-28:45:17.9 |
HIP 97191 |
23.87 |
| 2026-06-07 00:00 |
19:44:09.95 |
-28:46:45.5 |
HIP 97191 |
24.34 |
| 2026-06-07 12:00 |
19:43:53.84 |
-28:48:13.5 |
HIP 97191 |
25.40 |
| 2026-06-08 00:00 |
19:43:37.42 |
-28:49:41.7 |
HIP 96899 |
23.39 |
| 2026-06-08 12:00 |
19:43:20.68 |
-28:51:10.3 |
HIP 96899 |
19.68 |
| 2026-06-09 00:00 |
19:43:03.63 |
-28:52:39.2 |
HIP 96899 |
16.02 |
| 2026-06-09 12:00 |
19:42:46.26 |
-28:54:08.3 |
HIP 96899 |
12.51 |
| 2026-06-10 00:00 |
19:42:28.58 |
-28:55:37.7 |
HIP 96899 |
9.42 |
| 2026-06-10 12:00 |
19:42:10.59 |
-28:57:07.3 |
HIP 96899 |
7.41 |
| 2026-06-11 00:00 |
19:41:52.28 |
-28:58:37.1 |
HIP 96899 |
7.52 |
| 2026-06-11 12:00 |
19:41:33.67 |
-29:00:07.2 |
HIP 96899 |
9.76 |
| 2026-06-12 00:00 |
19:41:14.75 |
-29:01:37.3 |
HIP 96899 |
13.14 |
| 2026-06-12 12:00 |
19:40:55.52 |
-29:03:07.7 |
HIP 96899 |
17.05 |
| 2026-06-13 00:00 |
19:40:35.98 |
-29:04:38.2 |
HIP 96899 |
21.23 |
| 2026-06-13 12:00 |
19:40:16.14 |
-29:06:08.8 |
HIP 96909 |
25.48 |
| 2026-06-14 00:00 |
19:39:56.01 |
-29:07:39.4 |
HIP 96909 |
28.86 |
| 2026-06-14 12:00 |
19:39:35.57 |
-29:09:10.2 |
HIP 96566 |
30.22 |
| 2026-06-15 00:00 |
19:39:14.83 |
-29:10:40.9 |
HIP 96566 |
28.17 |
| 2026-06-15 12:00 |
19:38:53.81 |
-29:12:11.7 |
HIP 96566 |
26.79 |
| 2026-06-16 00:00 |
19:38:32.48 |
-29:13:42.5 |
HIP 96566 |
26.22 |
| 2026-06-16 12:00 |
19:38:10.87 |
-29:15:13.3 |
HIP 96566 |
26.56 |
| 2026-06-17 00:00 |
19:37:48.98 |
-29:16:44.0 |
HIP 96486 |
23.64 |
| 2026-06-17 12:00 |
19:37:26.80 |
-29:18:14.6 |
HIP 96486 |
20.16 |
| 2026-06-18 00:00 |
19:37:04.34 |
-29:19:45.1 |
HIP 96486 |
17.48 |
| 2026-06-18 12:00 |
19:36:41.60 |
-29:21:15.5 |
HIP 96486 |
16.03 |
| 2026-06-19 00:00 |
19:36:18.58 |
-29:22:45.7 |
HIP 96486 |
16.22 |
| 2026-06-19 12:00 |
19:35:55.29 |
-29:24:15.8 |
HIP 96486 |
18.04 |
| 2026-06-20 00:00 |
19:35:31.74 |
-29:25:45.7 |
HIP 96486 |
21.11 |
| 2026-06-20 12:00 |
19:35:07.92 |
-29:27:15.3 |
HIP 96486 |
25.01 |
| 2026-06-21 00:00 |
19:34:43.83 |
-29:28:44.8 |
HIP 96486 |
29.44 |
| 2026-06-21 12:00 |
19:34:19.49 |
-29:30:13.9 |
HIP 96486 |
34.22 |
| 2026-06-22 00:00 |
19:33:54.89 |
-29:31:42.7 |
HIP 95991 |
36.70 |