| Parameter |
Value |
| Designation |
C/2005 R4 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-03-08T00:19:13.751040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:52Z |
| Obs used |
491 |
| NEO |
- |
| M1 |
7.700 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-02-13.0000000 |
| e |
0.99748824 |
| q (au) |
5.188469 |
| a (au) |
2065.668817 |
| i (deg) |
164.012596 |
| Ω (om, deg) |
63.771672 |
| ω (w, deg) |
6.886614 |
| M (ma, deg) |
359.999758 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.968 + 4.305\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.968 |
| n |
4.305 |
| gf |
0.874 |
| gb |
-0.884 |
| k |
0.999 |
| δ90 |
1.000 |
| 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) |
| 2026-07-29 00:00 |
18:34:41.43 |
-13:29:55.0 |
HIP 91089 |
4.08 |
| 2026-07-29 12:00 |
18:34:38.26 |
-13:30:02.6 |
HIP 91089 |
4.51 |
| 2026-07-30 00:00 |
18:34:35.11 |
-13:30:10.2 |
HIP 91089 |
5.03 |
| 2026-07-30 12:00 |
18:34:31.97 |
-13:30:17.8 |
HIP 91089 |
5.60 |
| 2026-07-31 00:00 |
18:34:28.85 |
-13:30:25.5 |
HIP 91089 |
6.22 |
| 2026-07-31 12:00 |
18:34:25.74 |
-13:30:33.2 |
HIP 91089 |
6.87 |
| 2026-08-01 00:00 |
18:34:22.65 |
-13:30:41.0 |
HIP 91089 |
7.53 |
| 2026-08-01 12:00 |
18:34:19.57 |
-13:30:48.8 |
HIP 91089 |
8.21 |
| 2026-08-02 00:00 |
18:34:16.51 |
-13:30:56.7 |
HIP 91089 |
8.90 |
| 2026-08-02 12:00 |
18:34:13.46 |
-13:31:04.6 |
HIP 91089 |
9.60 |
| 2026-08-03 00:00 |
18:34:10.43 |
-13:31:12.5 |
HIP 91089 |
10.30 |
| 2026-08-03 12:00 |
18:34:07.41 |
-13:31:20.5 |
HIP 91089 |
11.01 |
| 2026-08-04 00:00 |
18:34:04.41 |
-13:31:28.5 |
HIP 91089 |
11.71 |
| 2026-08-04 12:00 |
18:34:01.43 |
-13:31:36.6 |
HIP 91089 |
12.42 |
| 2026-08-05 00:00 |
18:33:58.46 |
-13:31:44.7 |
HIP 91089 |
13.13 |
| 2026-08-05 12:00 |
18:33:55.51 |
-13:31:52.8 |
HIP 91089 |
13.83 |
| 2026-08-06 00:00 |
18:33:52.58 |
-13:32:01.0 |
HIP 91089 |
14.54 |
| 2026-08-06 12:00 |
18:33:49.66 |
-13:32:09.2 |
HIP 91089 |
15.24 |
| 2026-08-07 00:00 |
18:33:46.76 |
-13:32:17.4 |
HIP 91089 |
15.95 |
| 2026-08-07 12:00 |
18:33:43.88 |
-13:32:25.7 |
HIP 91089 |
16.65 |
| 2026-08-08 00:00 |
18:33:41.01 |
-13:32:34.1 |
HIP 91089 |
17.34 |
| 2026-08-08 12:00 |
18:33:38.17 |
-13:32:42.4 |
HIP 91089 |
18.04 |
| 2026-08-09 00:00 |
18:33:35.34 |
-13:32:50.8 |
HIP 91089 |
18.73 |
| 2026-08-09 12:00 |
18:33:32.53 |
-13:32:59.2 |
HIP 91089 |
19.42 |
| 2026-08-10 00:00 |
18:33:29.73 |
-13:33:07.7 |
HIP 91089 |
20.10 |
| 2026-08-10 12:00 |
18:33:26.96 |
-13:33:16.2 |
HIP 91089 |
20.78 |
| 2026-08-11 00:00 |
18:33:24.21 |
-13:33:24.7 |
HIP 91089 |
21.46 |
| 2026-08-11 12:00 |
18:33:21.47 |
-13:33:33.3 |
HIP 91089 |
22.14 |
| 2026-08-12 00:00 |
18:33:18.75 |
-13:33:41.9 |
HIP 91089 |
22.81 |
| 2026-08-12 12:00 |
18:33:16.06 |
-13:33:50.5 |
HIP 91089 |
23.47 |
| 2026-08-13 00:00 |
18:33:13.38 |
-13:33:59.1 |
HIP 91089 |
24.13 |
| 2026-08-13 12:00 |
18:33:10.72 |
-13:34:07.8 |
HIP 91089 |
24.79 |
| 2026-08-14 00:00 |
18:33:08.09 |
-13:34:16.5 |
HIP 91089 |
25.44 |
| 2026-08-14 12:00 |
18:33:05.47 |
-13:34:25.3 |
HIP 91089 |
26.09 |
| 2026-08-15 00:00 |
18:33:02.87 |
-13:34:34.0 |
HIP 91089 |
26.74 |
| 2026-08-15 12:00 |
18:33:00.30 |
-13:34:42.8 |
HIP 91089 |
27.38 |
| 2026-08-16 00:00 |
18:32:57.74 |
-13:34:51.6 |
HIP 91089 |
28.01 |
| 2026-08-16 12:00 |
18:32:55.21 |
-13:35:00.5 |
HIP 91089 |
28.65 |
| 2026-08-17 00:00 |
18:32:52.69 |
-13:35:09.4 |
HIP 91089 |
29.27 |
| 2026-08-17 12:00 |
18:32:50.20 |
-13:35:18.3 |
HIP 91089 |
29.89 |
| 2026-08-18 00:00 |
18:32:47.73 |
-13:35:27.2 |
HIP 91089 |
30.51 |
| 2026-08-18 12:00 |
18:32:45.28 |
-13:35:36.1 |
HIP 91089 |
31.12 |
| 2026-08-19 00:00 |
18:32:42.86 |
-13:35:45.1 |
HIP 91089 |
31.73 |