C/2008 R3 (LINEAR)
| Parameter |
Value |
| Designation |
C/2008 R3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-11-22T11:49:46.845120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:23Z |
| Obs used |
517 |
| NEO |
- |
| M1 |
13.400 |
| K1 |
8.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-11-02.0000000 |
| e |
0.89635151 |
| q (au) |
1.909016 |
| a (au) |
18.418176 |
| i (deg) |
43.237853 |
| Ω (om, deg) |
270.553144 |
| ω (w, deg) |
84.160425 |
| M (ma, deg) |
359.744473 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.812 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.812 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
09:21:24.26 |
-28:16:44.5 |
HIP 45716 |
30.52 |
| 2026-02-03 12:00 |
09:21:19.63 |
-28:16:36.0 |
HIP 45716 |
29.51 |
| 2026-02-04 00:00 |
09:21:15.00 |
-28:16:27.0 |
HIP 45716 |
28.49 |
| 2026-02-04 12:00 |
09:21:10.37 |
-28:16:17.6 |
HIP 45716 |
27.46 |
| 2026-02-05 00:00 |
09:21:05.73 |
-28:16:07.8 |
HIP 45716 |
26.44 |
| 2026-02-05 12:00 |
09:21:01.10 |
-28:15:57.6 |
HIP 45716 |
25.41 |
| 2026-02-06 00:00 |
09:20:56.46 |
-28:15:46.9 |
HIP 45716 |
24.38 |
| 2026-02-06 12:00 |
09:20:51.82 |
-28:15:35.8 |
HIP 45716 |
23.35 |
| 2026-02-07 00:00 |
09:20:47.18 |
-28:15:24.3 |
HIP 45716 |
22.32 |
| 2026-02-07 12:00 |
09:20:42.54 |
-28:15:12.4 |
HIP 45716 |
21.29 |
| 2026-02-08 00:00 |
09:20:37.90 |
-28:15:00.1 |
HIP 45716 |
20.26 |
| 2026-02-08 12:00 |
09:20:33.26 |
-28:14:47.3 |
HIP 45716 |
19.22 |
| 2026-02-09 00:00 |
09:20:28.62 |
-28:14:34.1 |
HIP 45716 |
18.19 |
| 2026-02-09 12:00 |
09:20:23.99 |
-28:14:20.5 |
HIP 45716 |
17.15 |
| 2026-02-10 00:00 |
09:20:19.35 |
-28:14:06.5 |
HIP 45716 |
16.11 |
| 2026-02-10 12:00 |
09:20:14.72 |
-28:13:52.1 |
HIP 45716 |
15.07 |
| 2026-02-11 00:00 |
09:20:10.09 |
-28:13:37.2 |
HIP 45716 |
14.03 |
| 2026-02-11 12:00 |
09:20:05.47 |
-28:13:22.0 |
HIP 45716 |
12.99 |
| 2026-02-12 00:00 |
09:20:00.85 |
-28:13:06.3 |
HIP 45716 |
11.95 |
| 2026-02-12 12:00 |
09:19:56.23 |
-28:12:50.3 |
HIP 45716 |
10.91 |
| 2026-02-13 00:00 |
09:19:51.62 |
-28:12:33.8 |
HIP 45716 |
9.87 |
| 2026-02-13 12:00 |
09:19:47.01 |
-28:12:16.9 |
HIP 45716 |
8.84 |
| 2026-02-14 00:00 |
09:19:42.40 |
-28:11:59.6 |
HIP 45716 |
7.80 |
| 2026-02-14 12:00 |
09:19:37.81 |
-28:11:41.9 |
HIP 45716 |
6.77 |
| 2026-02-15 00:00 |
09:19:33.22 |
-28:11:23.8 |
HIP 45716 |
5.74 |
| 2026-02-15 12:00 |
09:19:28.63 |
-28:11:05.4 |
HIP 45716 |
4.73 |
| 2026-02-16 00:00 |
09:19:24.05 |
-28:10:46.5 |
HIP 45716 |
3.73 |
| 2026-02-16 12:00 |
09:19:19.49 |
-28:10:27.2 |
HIP 45716 |
2.78 |
| 2026-02-17 00:00 |
09:19:14.92 |
-28:10:07.5 |
HIP 45716 |
1.92 |
| 2026-02-17 12:00 |
09:19:10.37 |
-28:09:47.5 |
HIP 45716 |
1.39 |
| 2026-02-18 00:00 |
09:19:05.83 |
-28:09:27.0 |
HIP 45716 |
1.54 |
| 2026-02-18 12:00 |
09:19:01.29 |
-28:09:06.2 |
HIP 45716 |
2.24 |
| 2026-02-19 00:00 |
09:18:56.77 |
-28:08:45.0 |
HIP 45716 |
3.15 |
| 2026-02-19 12:00 |
09:18:52.25 |
-28:08:23.4 |
HIP 45716 |
4.12 |
| 2026-02-20 00:00 |
09:18:47.75 |
-28:08:01.4 |
HIP 45716 |
5.13 |
| 2026-02-20 12:00 |
09:18:43.25 |
-28:07:39.1 |
HIP 45716 |
6.16 |
| 2026-02-21 00:00 |
09:18:38.77 |
-28:07:16.4 |
HIP 45716 |
7.19 |
| 2026-02-21 12:00 |
09:18:34.30 |
-28:06:53.3 |
HIP 45716 |
8.22 |
| 2026-02-22 00:00 |
09:18:29.84 |
-28:06:29.8 |
HIP 45716 |
9.27 |
| 2026-02-22 12:00 |
09:18:25.40 |
-28:06:06.0 |
HIP 45716 |
10.31 |
| 2026-02-23 00:00 |
09:18:20.97 |
-28:05:41.8 |
HIP 45716 |
11.35 |
| 2026-02-23 12:00 |
09:18:16.55 |
-28:05:17.3 |
HIP 45716 |
12.40 |
| 2026-02-24 00:00 |
09:18:12.14 |
-28:04:52.3 |
HIP 45716 |
13.44 |