C/2000 S3 (LONEOS)
| 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) |
| 2026-02-03 00:00 |
12:13:45.90 |
+20:18:50.7 |
HIP 59501 |
26.45 |
| 2026-02-03 12:00 |
12:13:42.48 |
+20:19:33.5 |
HIP 59501 |
25.39 |
| 2026-02-04 00:00 |
12:13:39.02 |
+20:20:16.2 |
HIP 59501 |
24.33 |
| 2026-02-04 12:00 |
12:13:35.51 |
+20:20:59.1 |
HIP 59501 |
23.26 |
| 2026-02-05 00:00 |
12:13:31.96 |
+20:21:42.0 |
HIP 59501 |
22.18 |
| 2026-02-05 12:00 |
12:13:28.36 |
+20:22:24.9 |
HIP 59501 |
21.10 |
| 2026-02-06 00:00 |
12:13:24.73 |
+20:23:07.8 |
HIP 59501 |
20.01 |
| 2026-02-06 12:00 |
12:13:21.05 |
+20:23:50.8 |
HIP 59501 |
18.91 |
| 2026-02-07 00:00 |
12:13:17.32 |
+20:24:33.8 |
HIP 59501 |
17.81 |
| 2026-02-07 12:00 |
12:13:13.56 |
+20:25:16.9 |
HIP 59501 |
16.70 |
| 2026-02-08 00:00 |
12:13:09.75 |
+20:26:00.0 |
HIP 59501 |
15.59 |
| 2026-02-08 12:00 |
12:13:05.91 |
+20:26:43.1 |
HIP 59501 |
14.47 |
| 2026-02-09 00:00 |
12:13:02.02 |
+20:27:26.2 |
HIP 59501 |
13.35 |
| 2026-02-09 12:00 |
12:12:58.09 |
+20:28:09.3 |
HIP 59501 |
12.23 |
| 2026-02-10 00:00 |
12:12:54.12 |
+20:28:52.4 |
HIP 59501 |
11.11 |
| 2026-02-10 12:00 |
12:12:50.11 |
+20:29:35.5 |
HIP 59501 |
10.00 |
| 2026-02-11 00:00 |
12:12:46.07 |
+20:30:18.6 |
HIP 59501 |
8.89 |
| 2026-02-11 12:00 |
12:12:41.98 |
+20:31:01.7 |
HIP 59501 |
7.80 |
| 2026-02-12 00:00 |
12:12:37.85 |
+20:31:44.8 |
HIP 59501 |
6.73 |
| 2026-02-12 12:00 |
12:12:33.69 |
+20:32:27.9 |
HIP 59501 |
5.71 |
| 2026-02-13 00:00 |
12:12:29.48 |
+20:33:10.9 |
HIP 59501 |
4.77 |
| 2026-02-13 12:00 |
12:12:25.24 |
+20:33:53.9 |
HIP 59501 |
3.98 |
| 2026-02-14 00:00 |
12:12:20.97 |
+20:34:36.9 |
HIP 59501 |
3.44 |
| 2026-02-14 12:00 |
12:12:16.65 |
+20:35:19.9 |
HIP 59501 |
3.29 |
| 2026-02-15 00:00 |
12:12:12.30 |
+20:36:02.8 |
HIP 59501 |
3.59 |
| 2026-02-15 12:00 |
12:12:07.91 |
+20:36:45.6 |
HIP 59501 |
4.25 |
| 2026-02-16 00:00 |
12:12:03.49 |
+20:37:28.4 |
HIP 59501 |
5.13 |
| 2026-02-16 12:00 |
12:11:59.03 |
+20:38:11.2 |
HIP 59501 |
6.15 |
| 2026-02-17 00:00 |
12:11:54.54 |
+20:38:53.9 |
HIP 59501 |
7.25 |
| 2026-02-17 12:00 |
12:11:50.01 |
+20:39:36.5 |
HIP 59501 |
8.40 |
| 2026-02-18 00:00 |
12:11:45.45 |
+20:40:19.1 |
HIP 59501 |
9.58 |
| 2026-02-18 12:00 |
12:11:40.85 |
+20:41:01.6 |
HIP 59501 |
10.80 |
| 2026-02-19 00:00 |
12:11:36.22 |
+20:41:44.0 |
HIP 59501 |
12.03 |
| 2026-02-19 12:00 |
12:11:31.56 |
+20:42:26.3 |
HIP 59501 |
13.27 |
| 2026-02-20 00:00 |
12:11:26.86 |
+20:43:08.5 |
HIP 59501 |
14.53 |
| 2026-02-20 12:00 |
12:11:22.14 |
+20:43:50.7 |
HIP 59501 |
15.81 |
| 2026-02-21 00:00 |
12:11:17.38 |
+20:44:32.7 |
HIP 59501 |
17.09 |
| 2026-02-21 12:00 |
12:11:12.59 |
+20:45:14.6 |
HIP 59501 |
18.38 |
| 2026-02-22 00:00 |
12:11:07.78 |
+20:45:56.5 |
HIP 59501 |
19.67 |
| 2026-02-22 12:00 |
12:11:02.93 |
+20:46:38.2 |
HIP 59501 |
20.98 |
| 2026-02-23 00:00 |
12:10:58.05 |
+20:47:19.8 |
HIP 59501 |
22.29 |
| 2026-02-23 12:00 |
12:10:53.15 |
+20:48:01.3 |
HIP 59501 |
23.61 |
| 2026-02-24 00:00 |
12:10:48.21 |
+20:48:42.6 |
HIP 59501 |
24.93 |