| Parameter |
Value |
| Designation |
C/2000 S3 (LONEOS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-07-16T07:19:31.595520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:06Z |
| Obs used |
33 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
21.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2000-10-24.0000000 |
| e |
0.77228725 |
| q (au) |
2.662232 |
| a (au) |
11.691185 |
| i (deg) |
25.164344 |
| Ω (om, deg) |
41.153195 |
| ω (w, deg) |
298.271387 |
| M (ma, deg) |
2.458039 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.319 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.319 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-0.587 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
12:05:18.99 |
+21:23:48.4 |
HIP 58990 |
10.39 |
| 2026-03-26 12:00 |
12:05:13.28 |
+21:24:14.9 |
HIP 58990 |
10.76 |
| 2026-03-27 00:00 |
12:05:07.57 |
+21:24:41.1 |
HIP 58990 |
11.29 |
| 2026-03-27 12:00 |
12:05:01.88 |
+21:25:07.0 |
HIP 58858 |
10.82 |
| 2026-03-28 00:00 |
12:04:56.18 |
+21:25:32.5 |
HIP 58858 |
9.43 |
| 2026-03-28 12:00 |
12:04:50.49 |
+21:25:57.6 |
HIP 58858 |
8.05 |
| 2026-03-29 00:00 |
12:04:44.81 |
+21:26:22.4 |
HIP 58858 |
6.67 |
| 2026-03-29 12:00 |
12:04:39.14 |
+21:26:46.8 |
HIP 58858 |
5.31 |
| 2026-03-30 00:00 |
12:04:33.47 |
+21:27:10.9 |
HIP 58858 |
3.95 |
| 2026-03-30 12:00 |
12:04:27.81 |
+21:27:34.6 |
HIP 58858 |
2.61 |
| 2026-03-31 00:00 |
12:04:22.16 |
+21:27:57.9 |
HIP 58858 |
1.36 |
| 2026-03-31 12:00 |
12:04:16.52 |
+21:28:20.9 |
HIP 58858 |
0.80 |
| 2026-04-01 00:00 |
12:04:10.89 |
+21:28:43.5 |
HIP 58858 |
1.77 |
| 2026-04-01 12:00 |
12:04:05.26 |
+21:29:05.7 |
HIP 58858 |
3.05 |
| 2026-04-02 00:00 |
12:03:59.65 |
+21:29:27.6 |
HIP 58858 |
4.38 |
| 2026-04-02 12:00 |
12:03:54.05 |
+21:29:49.1 |
HIP 58858 |
5.71 |
| 2026-04-03 00:00 |
12:03:48.46 |
+21:30:10.2 |
HIP 58858 |
7.05 |
| 2026-04-03 12:00 |
12:03:42.88 |
+21:30:31.0 |
HIP 58858 |
8.38 |
| 2026-04-04 00:00 |
12:03:37.31 |
+21:30:51.4 |
HIP 58858 |
9.71 |
| 2026-04-04 12:00 |
12:03:31.76 |
+21:31:11.4 |
HIP 58858 |
11.04 |
| 2026-04-05 00:00 |
12:03:26.22 |
+21:31:31.0 |
HIP 58858 |
12.37 |
| 2026-04-05 12:00 |
12:03:20.69 |
+21:31:50.2 |
HIP 58858 |
13.69 |
| 2026-04-06 00:00 |
12:03:15.18 |
+21:32:09.0 |
HIP 58858 |
15.00 |
| 2026-04-06 12:00 |
12:03:09.68 |
+21:32:27.5 |
HIP 58707 |
15.54 |
| 2026-04-07 00:00 |
12:03:04.20 |
+21:32:45.6 |
HIP 58707 |
14.55 |
| 2026-04-07 12:00 |
12:02:58.74 |
+21:33:03.2 |
HIP 58707 |
13.62 |
| 2026-04-08 00:00 |
12:02:53.29 |
+21:33:20.5 |
HIP 58707 |
12.77 |
| 2026-04-08 12:00 |
12:02:47.85 |
+21:33:37.4 |
HIP 58707 |
12.00 |
| 2026-04-09 00:00 |
12:02:42.44 |
+21:33:53.9 |
HIP 58707 |
11.34 |
| 2026-04-09 12:00 |
12:02:37.04 |
+21:34:10.0 |
HIP 58707 |
10.80 |
| 2026-04-10 00:00 |
12:02:31.66 |
+21:34:25.7 |
HIP 58707 |
10.40 |
| 2026-04-10 12:00 |
12:02:26.30 |
+21:34:41.0 |
HIP 58707 |
10.15 |
| 2026-04-11 00:00 |
12:02:20.96 |
+21:34:55.9 |
HIP 58707 |
10.06 |
| 2026-04-11 12:00 |
12:02:15.63 |
+21:35:10.4 |
HIP 58707 |
10.13 |
| 2026-04-12 00:00 |
12:02:10.33 |
+21:35:24.5 |
HIP 58707 |
10.36 |
| 2026-04-12 12:00 |
12:02:05.05 |
+21:35:38.2 |
HIP 58707 |
10.74 |
| 2026-04-13 00:00 |
12:01:59.79 |
+21:35:51.5 |
HIP 58707 |
11.25 |
| 2026-04-13 12:00 |
12:01:54.55 |
+21:36:04.4 |
HIP 58707 |
11.87 |
| 2026-04-14 00:00 |
12:01:49.33 |
+21:36:16.9 |
HIP 58707 |
12.58 |
| 2026-04-14 12:00 |
12:01:44.14 |
+21:36:28.9 |
HIP 58707 |
13.36 |
| 2026-04-15 00:00 |
12:01:38.97 |
+21:36:40.6 |
HIP 58707 |
14.21 |
| 2026-04-15 12:00 |
12:01:33.82 |
+21:36:51.8 |
HIP 58707 |
15.11 |
| 2026-04-16 00:00 |
12:01:28.70 |
+21:37:02.6 |
HIP 58707 |
16.04 |