C/2005 G1 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
05:24:22.73 |
-41:26:45.0 |
HIP 25362 |
13.93 |
| 2026-02-03 12:00 |
05:24:19.83 |
-41:26:14.1 |
HIP 25362 |
14.19 |
| 2026-02-04 00:00 |
05:24:16.96 |
-41:25:43.0 |
HIP 25362 |
14.48 |
| 2026-02-04 12:00 |
05:24:14.13 |
-41:25:11.6 |
HIP 25362 |
14.80 |
| 2026-02-05 00:00 |
05:24:11.32 |
-41:24:40.0 |
HIP 25362 |
15.14 |
| 2026-02-05 12:00 |
05:24:08.55 |
-41:24:08.2 |
HIP 25362 |
15.50 |
| 2026-02-06 00:00 |
05:24:05.81 |
-41:23:36.1 |
HIP 25362 |
15.88 |
| 2026-02-06 12:00 |
05:24:03.10 |
-41:23:03.8 |
HIP 25362 |
16.27 |
| 2026-02-07 00:00 |
05:24:00.43 |
-41:22:31.3 |
HIP 25362 |
16.69 |
| 2026-02-07 12:00 |
05:23:57.78 |
-41:21:58.6 |
HIP 25362 |
17.12 |
| 2026-02-08 00:00 |
05:23:55.17 |
-41:21:25.7 |
HIP 25362 |
17.57 |
| 2026-02-08 12:00 |
05:23:52.60 |
-41:20:52.5 |
HIP 25362 |
18.03 |
| 2026-02-09 00:00 |
05:23:50.05 |
-41:20:19.2 |
HIP 25362 |
18.49 |
| 2026-02-09 12:00 |
05:23:47.54 |
-41:19:45.6 |
HIP 25362 |
18.98 |
| 2026-02-10 00:00 |
05:23:45.07 |
-41:19:11.8 |
HIP 25362 |
19.47 |
| 2026-02-10 12:00 |
05:23:42.62 |
-41:18:37.9 |
HIP 25362 |
19.96 |
| 2026-02-11 00:00 |
05:23:40.21 |
-41:18:03.7 |
HIP 25362 |
20.47 |
| 2026-02-11 12:00 |
05:23:37.84 |
-41:17:29.3 |
HIP 25362 |
20.99 |
| 2026-02-12 00:00 |
05:23:35.50 |
-41:16:54.7 |
HIP 25362 |
21.51 |
| 2026-02-12 12:00 |
05:23:33.19 |
-41:16:20.0 |
HIP 25362 |
22.03 |
| 2026-02-13 00:00 |
05:23:30.92 |
-41:15:45.1 |
HIP 25362 |
22.57 |
| 2026-02-13 12:00 |
05:23:28.68 |
-41:15:09.9 |
HIP 25362 |
23.10 |
| 2026-02-14 00:00 |
05:23:26.48 |
-41:14:34.6 |
HIP 25362 |
23.64 |
| 2026-02-14 12:00 |
05:23:24.31 |
-41:13:59.2 |
HIP 25043 |
23.52 |
| 2026-02-15 00:00 |
05:23:22.18 |
-41:13:23.5 |
HIP 25043 |
22.84 |
| 2026-02-15 12:00 |
05:23:20.08 |
-41:12:47.7 |
HIP 25043 |
22.17 |
| 2026-02-16 00:00 |
05:23:18.01 |
-41:12:11.7 |
HIP 25043 |
21.50 |
| 2026-02-16 12:00 |
05:23:15.99 |
-41:11:35.6 |
HIP 25043 |
20.85 |
| 2026-02-17 00:00 |
05:23:14.00 |
-41:10:59.3 |
HIP 25043 |
20.19 |
| 2026-02-17 12:00 |
05:23:12.04 |
-41:10:22.8 |
HIP 25043 |
19.55 |
| 2026-02-18 00:00 |
05:23:10.12 |
-41:09:46.2 |
HIP 25043 |
18.92 |
| 2026-02-18 12:00 |
05:23:08.23 |
-41:09:09.5 |
HIP 25043 |
18.29 |
| 2026-02-19 00:00 |
05:23:06.39 |
-41:08:32.6 |
HIP 25043 |
17.68 |
| 2026-02-19 12:00 |
05:23:04.57 |
-41:07:55.5 |
HIP 25043 |
17.08 |
| 2026-02-20 00:00 |
05:23:02.80 |
-41:07:18.3 |
HIP 25043 |
16.49 |
| 2026-02-20 12:00 |
05:23:01.06 |
-41:06:41.0 |
HIP 25043 |
15.92 |
| 2026-02-21 00:00 |
05:22:59.35 |
-41:06:03.6 |
HIP 25043 |
15.36 |
| 2026-02-21 12:00 |
05:22:57.69 |
-41:05:26.0 |
HIP 25043 |
14.83 |
| 2026-02-22 00:00 |
05:22:56.05 |
-41:04:48.3 |
HIP 25043 |
14.31 |
| 2026-02-22 12:00 |
05:22:54.46 |
-41:04:10.5 |
HIP 25043 |
13.81 |
| 2026-02-23 00:00 |
05:22:52.90 |
-41:03:32.5 |
HIP 25043 |
13.33 |
| 2026-02-23 12:00 |
05:22:51.38 |
-41:02:54.5 |
HIP 25043 |
12.89 |
| 2026-02-24 00:00 |
05:22:49.90 |
-41:02:16.3 |
HIP 25043 |
12.47 |