| Parameter |
Value |
| Designation |
C/2001 G1 (LONEOS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-10-09T05:10:18.793920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
134 |
| NEO |
- |
| M1 |
9.800 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-01-12.0000000 |
| e |
1.00280088 |
| q (au) |
8.235531 |
| a (au) |
-2940.336115 |
| i (deg) |
45.364449 |
| Ω (om, deg) |
203.891133 |
| ω (w, deg) |
343.281547 |
| M (ma, deg) |
0.000586 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.467 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.467 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.502 |
| k |
1.000 |
| 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 |
| 2002-04-04 |
2004-05-28 |
-40.2814 |
+37.563 |
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 |
20:45:02.90 |
+26:07:06.8 |
HIP 102442 |
5.95 |
| 2026-06-01 12:00 |
20:45:01.62 |
+26:07:28.1 |
HIP 102442 |
6.29 |
| 2026-06-02 00:00 |
20:45:00.32 |
+26:07:49.3 |
HIP 102442 |
6.65 |
| 2026-06-02 12:00 |
20:44:58.99 |
+26:08:10.3 |
HIP 102442 |
7.02 |
| 2026-06-03 00:00 |
20:44:57.65 |
+26:08:31.1 |
HIP 102442 |
7.41 |
| 2026-06-03 12:00 |
20:44:56.28 |
+26:08:51.7 |
HIP 102442 |
7.81 |
| 2026-06-04 00:00 |
20:44:54.89 |
+26:09:12.1 |
HIP 102442 |
8.21 |
| 2026-06-04 12:00 |
20:44:53.47 |
+26:09:32.4 |
HIP 102442 |
8.63 |
| 2026-06-05 00:00 |
20:44:52.04 |
+26:09:52.4 |
HIP 102442 |
9.06 |
| 2026-06-05 12:00 |
20:44:50.58 |
+26:10:12.2 |
HIP 102442 |
9.49 |
| 2026-06-06 00:00 |
20:44:49.10 |
+26:10:31.9 |
HIP 102442 |
9.92 |
| 2026-06-06 12:00 |
20:44:47.60 |
+26:10:51.3 |
HIP 102442 |
10.37 |
| 2026-06-07 00:00 |
20:44:46.08 |
+26:11:10.5 |
HIP 102442 |
10.81 |
| 2026-06-07 12:00 |
20:44:44.54 |
+26:11:29.5 |
HIP 102442 |
11.27 |
| 2026-06-08 00:00 |
20:44:42.97 |
+26:11:48.3 |
HIP 102442 |
11.72 |
| 2026-06-08 12:00 |
20:44:41.39 |
+26:12:07.0 |
HIP 102442 |
12.18 |
| 2026-06-09 00:00 |
20:44:39.78 |
+26:12:25.4 |
HIP 102442 |
12.64 |
| 2026-06-09 12:00 |
20:44:38.16 |
+26:12:43.6 |
HIP 102442 |
13.11 |
| 2026-06-10 00:00 |
20:44:36.51 |
+26:13:01.5 |
HIP 102442 |
13.58 |
| 2026-06-10 12:00 |
20:44:34.84 |
+26:13:19.3 |
HIP 102442 |
14.05 |
| 2026-06-11 00:00 |
20:44:33.15 |
+26:13:36.9 |
HIP 102442 |
14.52 |
| 2026-06-11 12:00 |
20:44:31.44 |
+26:13:54.2 |
HIP 102442 |
15.00 |
| 2026-06-12 00:00 |
20:44:29.71 |
+26:14:11.3 |
HIP 102442 |
15.48 |
| 2026-06-12 12:00 |
20:44:27.96 |
+26:14:28.2 |
HIP 102442 |
15.96 |
| 2026-06-13 00:00 |
20:44:26.20 |
+26:14:44.9 |
HIP 102442 |
16.44 |
| 2026-06-13 12:00 |
20:44:24.41 |
+26:15:01.3 |
HIP 102442 |
16.93 |
| 2026-06-14 00:00 |
20:44:22.60 |
+26:15:17.6 |
HIP 102442 |
17.41 |
| 2026-06-14 12:00 |
20:44:20.77 |
+26:15:33.6 |
HIP 102442 |
17.90 |
| 2026-06-15 00:00 |
20:44:18.92 |
+26:15:49.4 |
HIP 102442 |
18.39 |
| 2026-06-15 12:00 |
20:44:17.06 |
+26:16:04.9 |
HIP 102442 |
18.89 |
| 2026-06-16 00:00 |
20:44:15.17 |
+26:16:20.2 |
HIP 102442 |
19.38 |
| 2026-06-16 12:00 |
20:44:13.27 |
+26:16:35.3 |
HIP 102442 |
19.87 |
| 2026-06-17 00:00 |
20:44:11.35 |
+26:16:50.2 |
HIP 102442 |
20.37 |
| 2026-06-17 12:00 |
20:44:09.41 |
+26:17:04.8 |
HIP 102442 |
20.87 |
| 2026-06-18 00:00 |
20:44:07.45 |
+26:17:19.2 |
HIP 102442 |
21.37 |
| 2026-06-18 12:00 |
20:44:05.47 |
+26:17:33.4 |
HIP 102442 |
21.87 |
| 2026-06-19 00:00 |
20:44:03.48 |
+26:17:47.3 |
HIP 102442 |
22.37 |
| 2026-06-19 12:00 |
20:44:01.46 |
+26:18:01.0 |
HIP 102442 |
22.88 |
| 2026-06-20 00:00 |
20:43:59.44 |
+26:18:14.4 |
HIP 102442 |
23.38 |
| 2026-06-20 12:00 |
20:43:57.39 |
+26:18:27.6 |
HIP 102442 |
23.89 |
| 2026-06-21 00:00 |
20:43:55.32 |
+26:18:40.6 |
HIP 102442 |
24.40 |
| 2026-06-21 12:00 |
20:43:53.24 |
+26:18:53.3 |
HIP 102442 |
24.91 |
| 2026-06-22 00:00 |
20:43:51.15 |
+26:19:05.8 |
HIP 102442 |
25.42 |