C/2005 R4 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
18:42:49.00 |
-13:42:58.3 |
HIP 91608 |
33.88 |
| 2026-02-03 12:00 |
18:42:51.46 |
-13:42:52.3 |
HIP 91608 |
34.30 |
| 2026-02-04 00:00 |
18:42:53.89 |
-13:42:46.2 |
HIP 91608 |
34.72 |
| 2026-02-04 12:00 |
18:42:56.31 |
-13:42:40.0 |
HIP 91608 |
35.15 |
| 2026-02-05 00:00 |
18:42:58.71 |
-13:42:33.8 |
HIP 91608 |
35.57 |
| 2026-02-05 12:00 |
18:43:01.10 |
-13:42:27.6 |
HIP 91608 |
36.00 |
| 2026-02-06 00:00 |
18:43:03.47 |
-13:42:21.4 |
HIP 91929 |
35.62 |
| 2026-02-06 12:00 |
18:43:05.82 |
-13:42:15.1 |
HIP 91929 |
35.21 |
| 2026-02-07 00:00 |
18:43:08.16 |
-13:42:08.8 |
HIP 91929 |
34.82 |
| 2026-02-07 12:00 |
18:43:10.48 |
-13:42:02.4 |
HIP 91929 |
34.43 |
| 2026-02-08 00:00 |
18:43:12.78 |
-13:41:56.0 |
HIP 91929 |
34.04 |
| 2026-02-08 12:00 |
18:43:15.07 |
-13:41:49.5 |
HIP 91929 |
33.67 |
| 2026-02-09 00:00 |
18:43:17.33 |
-13:41:43.1 |
HIP 91929 |
33.30 |
| 2026-02-09 12:00 |
18:43:19.58 |
-13:41:36.5 |
HIP 91929 |
32.93 |
| 2026-02-10 00:00 |
18:43:21.82 |
-13:41:30.0 |
HIP 91929 |
32.58 |
| 2026-02-10 12:00 |
18:43:24.03 |
-13:41:23.4 |
HIP 91929 |
32.23 |
| 2026-02-11 00:00 |
18:43:26.22 |
-13:41:16.8 |
HIP 91929 |
31.89 |
| 2026-02-11 12:00 |
18:43:28.40 |
-13:41:10.1 |
HIP 91929 |
31.55 |
| 2026-02-12 00:00 |
18:43:30.55 |
-13:41:03.5 |
HIP 91929 |
31.23 |
| 2026-02-12 12:00 |
18:43:32.69 |
-13:40:56.7 |
HIP 92044 |
30.89 |
| 2026-02-13 00:00 |
18:43:34.81 |
-13:40:50.0 |
HIP 92044 |
30.38 |
| 2026-02-13 12:00 |
18:43:36.91 |
-13:40:43.2 |
HIP 92044 |
29.87 |
| 2026-02-14 00:00 |
18:43:38.99 |
-13:40:36.4 |
HIP 92044 |
29.36 |
| 2026-02-14 12:00 |
18:43:41.05 |
-13:40:29.6 |
HIP 92044 |
28.86 |
| 2026-02-15 00:00 |
18:43:43.09 |
-13:40:22.7 |
HIP 92044 |
28.36 |
| 2026-02-15 12:00 |
18:43:45.11 |
-13:40:15.8 |
HIP 92044 |
27.87 |
| 2026-02-16 00:00 |
18:43:47.11 |
-13:40:08.9 |
HIP 92044 |
27.39 |
| 2026-02-16 12:00 |
18:43:49.08 |
-13:40:01.9 |
HIP 92044 |
26.91 |
| 2026-02-17 00:00 |
18:43:51.04 |
-13:39:55.0 |
HIP 92044 |
26.43 |
| 2026-02-17 12:00 |
18:43:52.98 |
-13:39:48.0 |
HIP 92044 |
25.96 |
| 2026-02-18 00:00 |
18:43:54.89 |
-13:39:40.9 |
HIP 92044 |
25.50 |
| 2026-02-18 12:00 |
18:43:56.79 |
-13:39:33.9 |
HIP 92044 |
25.05 |
| 2026-02-19 00:00 |
18:43:58.66 |
-13:39:26.8 |
HIP 92044 |
24.59 |
| 2026-02-19 12:00 |
18:44:00.51 |
-13:39:19.7 |
HIP 92044 |
24.15 |
| 2026-02-20 00:00 |
18:44:02.34 |
-13:39:12.6 |
HIP 92044 |
23.71 |
| 2026-02-20 12:00 |
18:44:04.15 |
-13:39:05.5 |
HIP 92044 |
23.28 |
| 2026-02-21 00:00 |
18:44:05.94 |
-13:38:58.3 |
HIP 92044 |
22.85 |
| 2026-02-21 12:00 |
18:44:07.70 |
-13:38:51.1 |
HIP 92044 |
22.43 |
| 2026-02-22 00:00 |
18:44:09.44 |
-13:38:43.9 |
HIP 92044 |
22.02 |
| 2026-02-22 12:00 |
18:44:11.16 |
-13:38:36.7 |
HIP 92044 |
21.61 |
| 2026-02-23 00:00 |
18:44:12.85 |
-13:38:29.5 |
HIP 92044 |
21.21 |
| 2026-02-23 12:00 |
18:44:14.53 |
-13:38:22.2 |
HIP 92044 |
20.81 |
| 2026-02-24 00:00 |
18:44:16.18 |
-13:38:15.0 |
HIP 92044 |
20.43 |