| Parameter |
Value |
| Designation |
C/2005 Q1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-08-25T12:09:34.352640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:52Z |
| Obs used |
156 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-01-21.0000000 |
| e |
1.00432420 |
| q (au) |
6.408393 |
| a (au) |
-1481.983927 |
| i (deg) |
105.191606 |
| Ω (om, deg) |
87.731669 |
| ω (w, deg) |
44.690926 |
| M (ma, deg) |
0.002565 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.726 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.726 |
| n |
2.000 |
| gf |
0.893 |
| gb |
-0.911 |
| k |
0.802 |
| δ90 |
9.226 |
| 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) |
| 2026-07-29 00:00 |
17:51:05.72 |
-19:07:43.3 |
HIP 87388 |
9.70 |
| 2026-07-29 12:00 |
17:51:02.99 |
-19:07:49.4 |
HIP 87388 |
10.14 |
| 2026-07-30 00:00 |
17:51:00.28 |
-19:07:55.5 |
HIP 87388 |
10.60 |
| 2026-07-30 12:00 |
17:50:57.59 |
-19:08:01.7 |
HIP 87388 |
11.08 |
| 2026-07-31 00:00 |
17:50:54.92 |
-19:08:07.9 |
HIP 87388 |
11.57 |
| 2026-07-31 12:00 |
17:50:52.27 |
-19:08:14.1 |
HIP 87388 |
12.07 |
| 2026-08-01 00:00 |
17:50:49.63 |
-19:08:20.3 |
HIP 87388 |
12.58 |
| 2026-08-01 12:00 |
17:50:47.02 |
-19:08:26.6 |
HIP 87388 |
13.10 |
| 2026-08-02 00:00 |
17:50:44.42 |
-19:08:32.9 |
HIP 87388 |
13.62 |
| 2026-08-02 12:00 |
17:50:41.85 |
-19:08:39.2 |
HIP 87388 |
14.15 |
| 2026-08-03 00:00 |
17:50:39.29 |
-19:08:45.5 |
HIP 87388 |
14.68 |
| 2026-08-03 12:00 |
17:50:36.76 |
-19:08:51.8 |
HIP 87388 |
15.21 |
| 2026-08-04 00:00 |
17:50:34.24 |
-19:08:58.2 |
HIP 87388 |
15.75 |
| 2026-08-04 12:00 |
17:50:31.75 |
-19:09:04.6 |
HIP 87388 |
16.28 |
| 2026-08-05 00:00 |
17:50:29.28 |
-19:09:11.0 |
HIP 87388 |
16.82 |
| 2026-08-05 12:00 |
17:50:26.82 |
-19:09:17.4 |
HIP 87388 |
17.36 |
| 2026-08-06 00:00 |
17:50:24.39 |
-19:09:23.8 |
HIP 87388 |
17.89 |
| 2026-08-06 12:00 |
17:50:21.98 |
-19:09:30.3 |
HIP 87388 |
18.43 |
| 2026-08-07 00:00 |
17:50:19.59 |
-19:09:36.8 |
HIP 87388 |
18.96 |
| 2026-08-07 12:00 |
17:50:17.23 |
-19:09:43.3 |
HIP 87388 |
19.50 |
| 2026-08-08 00:00 |
17:50:14.88 |
-19:09:49.9 |
HIP 87388 |
20.03 |
| 2026-08-08 12:00 |
17:50:12.56 |
-19:09:56.4 |
HIP 87388 |
20.55 |
| 2026-08-09 00:00 |
17:50:10.25 |
-19:10:03.0 |
HIP 87388 |
21.08 |
| 2026-08-09 12:00 |
17:50:07.97 |
-19:10:09.6 |
HIP 87388 |
21.60 |
| 2026-08-10 00:00 |
17:50:05.72 |
-19:10:16.2 |
HIP 87388 |
22.12 |
| 2026-08-10 12:00 |
17:50:03.48 |
-19:10:22.8 |
HIP 87388 |
22.63 |
| 2026-08-11 00:00 |
17:50:01.27 |
-19:10:29.5 |
HIP 87388 |
23.15 |
| 2026-08-11 12:00 |
17:49:59.08 |
-19:10:36.2 |
HIP 87388 |
23.65 |
| 2026-08-12 00:00 |
17:49:56.92 |
-19:10:42.9 |
HIP 87388 |
24.16 |
| 2026-08-12 12:00 |
17:49:54.77 |
-19:10:49.6 |
HIP 87388 |
24.66 |
| 2026-08-13 00:00 |
17:49:52.65 |
-19:10:56.3 |
HIP 87176 |
24.51 |
| 2026-08-13 12:00 |
17:49:50.56 |
-19:11:03.1 |
HIP 87176 |
24.24 |
| 2026-08-14 00:00 |
17:49:48.49 |
-19:11:09.9 |
HIP 87176 |
23.98 |
| 2026-08-14 12:00 |
17:49:46.44 |
-19:11:16.7 |
HIP 87176 |
23.73 |
| 2026-08-15 00:00 |
17:49:44.42 |
-19:11:23.5 |
HIP 87176 |
23.50 |
| 2026-08-15 12:00 |
17:49:42.42 |
-19:11:30.3 |
HIP 87176 |
23.27 |
| 2026-08-16 00:00 |
17:49:40.44 |
-19:11:37.2 |
HIP 87176 |
23.06 |
| 2026-08-16 12:00 |
17:49:38.49 |
-19:11:44.0 |
HIP 87176 |
22.86 |
| 2026-08-17 00:00 |
17:49:36.57 |
-19:11:50.9 |
HIP 87176 |
22.68 |
| 2026-08-17 12:00 |
17:49:34.66 |
-19:11:57.8 |
HIP 87176 |
22.50 |
| 2026-08-18 00:00 |
17:49:32.79 |
-19:12:04.8 |
HIP 87176 |
22.34 |
| 2026-08-18 12:00 |
17:49:30.94 |
-19:12:11.7 |
HIP 87176 |
22.19 |
| 2026-08-19 00:00 |
17:49:29.11 |
-19:12:18.7 |
HIP 87176 |
22.05 |