| Parameter |
Value |
| Designation |
C/2005 G1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-02-27T06:21:42.981120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:48Z |
| Obs used |
287 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
10.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-08-17.0000000 |
| e |
0.99973621 |
| q (au) |
4.960798 |
| a (au) |
18805.663709 |
| i (deg) |
108.413949 |
| Ω (om, deg) |
299.589019 |
| ω (w, deg) |
113.810280 |
| M (ma, deg) |
359.999926 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.167 + 5.406\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.167 |
| n |
5.406 |
| gf |
0.997 |
| gb |
-1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
05:22:27.79 |
-40:22:49.1 |
HIP 25021 |
25.83 |
| 2026-03-26 12:00 |
05:22:28.52 |
-40:22:10.4 |
HIP 25021 |
26.47 |
| 2026-03-27 00:00 |
05:22:29.29 |
-40:21:31.8 |
HIP 25021 |
27.11 |
| 2026-03-27 12:00 |
05:22:30.08 |
-40:20:53.3 |
HIP 25021 |
27.75 |
| 2026-03-28 00:00 |
05:22:30.91 |
-40:20:14.9 |
HIP 25021 |
28.40 |
| 2026-03-28 12:00 |
05:22:31.78 |
-40:19:36.5 |
HIP 25021 |
29.05 |
| 2026-03-29 00:00 |
05:22:32.68 |
-40:18:58.3 |
HIP 25021 |
29.70 |
| 2026-03-29 12:00 |
05:22:33.61 |
-40:18:20.2 |
HIP 25021 |
30.35 |
| 2026-03-30 00:00 |
05:22:34.57 |
-40:17:42.2 |
HIP 25021 |
31.00 |
| 2026-03-30 12:00 |
05:22:35.57 |
-40:17:04.3 |
HIP 25021 |
31.65 |
| 2026-03-31 00:00 |
05:22:36.60 |
-40:16:26.5 |
HIP 25021 |
32.31 |
| 2026-03-31 12:00 |
05:22:37.67 |
-40:15:48.8 |
HIP 25021 |
32.96 |
| 2026-04-01 00:00 |
05:22:38.76 |
-40:15:11.3 |
HIP 25021 |
33.62 |
| 2026-04-01 12:00 |
05:22:39.89 |
-40:14:33.9 |
HIP 25021 |
34.28 |
| 2026-04-02 00:00 |
05:22:41.06 |
-40:13:56.6 |
HIP 25194 |
34.24 |
| 2026-04-02 12:00 |
05:22:42.25 |
-40:13:19.4 |
HIP 25194 |
33.58 |
| 2026-04-03 00:00 |
05:22:43.48 |
-40:12:42.3 |
HIP 25194 |
32.93 |
| 2026-04-03 12:00 |
05:22:44.74 |
-40:12:05.4 |
HIP 25194 |
32.27 |
| 2026-04-04 00:00 |
05:22:46.03 |
-40:11:28.6 |
HIP 25194 |
31.62 |
| 2026-04-04 12:00 |
05:22:47.35 |
-40:10:52.0 |
HIP 25194 |
30.97 |
| 2026-04-05 00:00 |
05:22:48.71 |
-40:10:15.4 |
HIP 25194 |
30.32 |
| 2026-04-05 12:00 |
05:22:50.10 |
-40:09:39.1 |
HIP 25194 |
29.67 |
| 2026-04-06 00:00 |
05:22:51.51 |
-40:09:02.8 |
HIP 25194 |
29.02 |
| 2026-04-06 12:00 |
05:22:52.96 |
-40:08:26.8 |
HIP 25194 |
28.37 |
| 2026-04-07 00:00 |
05:22:54.44 |
-40:07:50.8 |
HIP 25194 |
27.73 |
| 2026-04-07 12:00 |
05:22:55.96 |
-40:07:15.1 |
HIP 25194 |
27.08 |
| 2026-04-08 00:00 |
05:22:57.50 |
-40:06:39.4 |
HIP 25194 |
26.44 |
| 2026-04-08 12:00 |
05:22:59.07 |
-40:06:04.0 |
HIP 25194 |
25.81 |
| 2026-04-09 00:00 |
05:23:00.68 |
-40:05:28.6 |
HIP 25194 |
25.17 |
| 2026-04-09 12:00 |
05:23:02.31 |
-40:04:53.5 |
HIP 25194 |
24.54 |
| 2026-04-10 00:00 |
05:23:03.98 |
-40:04:18.5 |
HIP 25194 |
23.91 |
| 2026-04-10 12:00 |
05:23:05.67 |
-40:03:43.7 |
HIP 25194 |
23.29 |
| 2026-04-11 00:00 |
05:23:07.40 |
-40:03:09.1 |
HIP 25194 |
22.67 |
| 2026-04-11 12:00 |
05:23:09.15 |
-40:02:34.6 |
HIP 25194 |
22.06 |
| 2026-04-12 00:00 |
05:23:10.94 |
-40:02:00.3 |
HIP 25194 |
21.45 |
| 2026-04-12 12:00 |
05:23:12.75 |
-40:01:26.2 |
HIP 25194 |
20.84 |
| 2026-04-13 00:00 |
05:23:14.60 |
-40:00:52.2 |
HIP 25194 |
20.24 |
| 2026-04-13 12:00 |
05:23:16.47 |
-40:00:18.5 |
HIP 25194 |
19.65 |
| 2026-04-14 00:00 |
05:23:18.37 |
-39:59:44.9 |
HIP 25194 |
19.07 |
| 2026-04-14 12:00 |
05:23:20.30 |
-39:59:11.5 |
HIP 25194 |
18.50 |
| 2026-04-15 00:00 |
05:23:22.26 |
-39:58:38.3 |
HIP 25194 |
17.94 |
| 2026-04-15 12:00 |
05:23:24.25 |
-39:58:05.3 |
HIP 25194 |
17.38 |
| 2026-04-16 00:00 |
05:23:26.27 |
-39:57:32.5 |
HIP 25194 |
16.84 |