| Parameter |
Value |
| Designation |
C/2003 R1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2003-06-29T14:48:29.845440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:31Z |
| Obs used |
170 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
7.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-10-14.0000000 |
| e |
0.89331449 |
| q (au) |
2.101884 |
| a (au) |
19.701685 |
| i (deg) |
149.195633 |
| Ω (om, deg) |
356.689063 |
| ω (w, deg) |
302.690112 |
| M (ma, deg) |
1.199006 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.163 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.163 |
| n |
2.000 |
| gf |
0.895 |
| gb |
-0.841 |
| k |
0.985 |
| 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) |
| 2026-09-20 00:00 |
16:17:04.44 |
+07:21:30.1 |
HIP 79792 |
12.41 |
| 2026-09-20 12:00 |
16:17:05.57 |
+07:21:02.3 |
HIP 79792 |
11.97 |
| 2026-09-21 00:00 |
16:17:06.72 |
+07:20:34.5 |
HIP 79792 |
11.54 |
| 2026-09-21 12:00 |
16:17:07.91 |
+07:20:06.7 |
HIP 79792 |
11.12 |
| 2026-09-22 00:00 |
16:17:09.12 |
+07:19:38.9 |
HIP 79792 |
10.72 |
| 2026-09-22 12:00 |
16:17:10.36 |
+07:19:11.2 |
HIP 79792 |
10.33 |
| 2026-09-23 00:00 |
16:17:11.63 |
+07:18:43.5 |
HIP 79792 |
9.95 |
| 2026-09-23 12:00 |
16:17:12.93 |
+07:18:15.9 |
HIP 79792 |
9.60 |
| 2026-09-24 00:00 |
16:17:14.26 |
+07:17:48.3 |
HIP 79792 |
9.27 |
| 2026-09-24 12:00 |
16:17:15.61 |
+07:17:20.7 |
HIP 79792 |
8.97 |
| 2026-09-25 00:00 |
16:17:16.99 |
+07:16:53.2 |
HIP 79792 |
8.70 |
| 2026-09-25 12:00 |
16:17:18.40 |
+07:16:25.7 |
HIP 79792 |
8.47 |
| 2026-09-26 00:00 |
16:17:19.84 |
+07:15:58.3 |
HIP 79792 |
8.27 |
| 2026-09-26 12:00 |
16:17:21.30 |
+07:15:30.9 |
HIP 79792 |
8.11 |
| 2026-09-27 00:00 |
16:17:22.79 |
+07:15:03.6 |
HIP 79792 |
8.00 |
| 2026-09-27 12:00 |
16:17:24.31 |
+07:14:36.3 |
HIP 79792 |
7.93 |
| 2026-09-28 00:00 |
16:17:25.85 |
+07:14:09.1 |
HIP 79792 |
7.92 |
| 2026-09-28 12:00 |
16:17:27.42 |
+07:13:41.9 |
HIP 79792 |
7.95 |
| 2026-09-29 00:00 |
16:17:29.02 |
+07:13:14.8 |
HIP 79792 |
8.04 |
| 2026-09-29 12:00 |
16:17:30.64 |
+07:12:47.8 |
HIP 79792 |
8.17 |
| 2026-09-30 00:00 |
16:17:32.29 |
+07:12:20.8 |
HIP 79792 |
8.36 |
| 2026-09-30 12:00 |
16:17:33.97 |
+07:11:53.8 |
HIP 79792 |
8.59 |
| 2026-10-01 00:00 |
16:17:35.67 |
+07:11:27.0 |
HIP 79792 |
8.86 |
| 2026-10-01 12:00 |
16:17:37.40 |
+07:11:00.2 |
HIP 79792 |
9.17 |
| 2026-10-02 00:00 |
16:17:39.15 |
+07:10:33.4 |
HIP 79792 |
9.52 |
| 2026-10-02 12:00 |
16:17:40.93 |
+07:10:06.8 |
HIP 79828 |
9.31 |
| 2026-10-03 00:00 |
16:17:42.74 |
+07:09:40.2 |
HIP 79828 |
8.93 |
| 2026-10-03 12:00 |
16:17:44.57 |
+07:09:13.7 |
HIP 79828 |
8.59 |
| 2026-10-04 00:00 |
16:17:46.43 |
+07:08:47.2 |
HIP 79828 |
8.27 |
| 2026-10-04 12:00 |
16:17:48.31 |
+07:08:20.8 |
HIP 79828 |
8.01 |
| 2026-10-05 00:00 |
16:17:50.22 |
+07:07:54.5 |
HIP 79828 |
7.79 |
| 2026-10-05 12:00 |
16:17:52.15 |
+07:07:28.3 |
HIP 79828 |
7.62 |
| 2026-10-06 00:00 |
16:17:54.11 |
+07:07:02.2 |
HIP 79828 |
7.50 |
| 2026-10-06 12:00 |
16:17:56.09 |
+07:06:36.2 |
HIP 79828 |
7.45 |
| 2026-10-07 00:00 |
16:17:58.10 |
+07:06:10.2 |
HIP 79828 |
7.47 |
| 2026-10-07 12:00 |
16:18:00.13 |
+07:05:44.3 |
HIP 79828 |
7.54 |
| 2026-10-08 00:00 |
16:18:02.18 |
+07:05:18.6 |
HIP 79828 |
7.68 |
| 2026-10-08 12:00 |
16:18:04.26 |
+07:04:52.9 |
HIP 79828 |
7.88 |
| 2026-10-09 00:00 |
16:18:06.37 |
+07:04:27.3 |
HIP 79828 |
8.13 |
| 2026-10-09 12:00 |
16:18:08.49 |
+07:04:01.8 |
HIP 79828 |
8.44 |
| 2026-10-10 00:00 |
16:18:10.64 |
+07:03:36.4 |
HIP 79828 |
8.79 |
| 2026-10-10 12:00 |
16:18:12.82 |
+07:03:11.1 |
HIP 79828 |
9.19 |
| 2026-10-11 00:00 |
16:18:15.02 |
+07:02:45.9 |
HIP 79828 |
9.63 |