C/2003 R1 (LINEAR)
| 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 |
0.875 |
| 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) |
| 2026-02-03 00:00 |
16:32:11.83 |
+06:49:33.5 |
HIP 81026 |
11.02 |
| 2026-02-03 12:00 |
16:32:13.25 |
+06:49:54.8 |
HIP 81026 |
10.62 |
| 2026-02-04 00:00 |
16:32:14.64 |
+06:50:16.3 |
HIP 81026 |
10.23 |
| 2026-02-04 12:00 |
16:32:16.00 |
+06:50:38.0 |
HIP 81026 |
9.85 |
| 2026-02-05 00:00 |
16:32:17.33 |
+06:50:59.8 |
HIP 81026 |
9.50 |
| 2026-02-05 12:00 |
16:32:18.63 |
+06:51:21.8 |
HIP 81026 |
9.16 |
| 2026-02-06 00:00 |
16:32:19.90 |
+06:51:44.0 |
HIP 81026 |
8.85 |
| 2026-02-06 12:00 |
16:32:21.14 |
+06:52:06.3 |
HIP 81026 |
8.56 |
| 2026-02-07 00:00 |
16:32:22.35 |
+06:52:28.8 |
HIP 81026 |
8.30 |
| 2026-02-07 12:00 |
16:32:23.53 |
+06:52:51.4 |
HIP 81026 |
8.06 |
| 2026-02-08 00:00 |
16:32:24.68 |
+06:53:14.2 |
HIP 81026 |
7.86 |
| 2026-02-08 12:00 |
16:32:25.80 |
+06:53:37.2 |
HIP 81026 |
7.68 |
| 2026-02-09 00:00 |
16:32:26.89 |
+06:54:00.3 |
HIP 81026 |
7.54 |
| 2026-02-09 12:00 |
16:32:27.95 |
+06:54:23.6 |
HIP 81026 |
7.44 |
| 2026-02-10 00:00 |
16:32:28.98 |
+06:54:47.0 |
HIP 81026 |
7.37 |
| 2026-02-10 12:00 |
16:32:29.98 |
+06:55:10.6 |
HIP 81026 |
7.33 |
| 2026-02-11 00:00 |
16:32:30.95 |
+06:55:34.3 |
HIP 81026 |
7.34 |
| 2026-02-11 12:00 |
16:32:31.88 |
+06:55:58.1 |
HIP 81026 |
7.38 |
| 2026-02-12 00:00 |
16:32:32.79 |
+06:56:22.2 |
HIP 81026 |
7.46 |
| 2026-02-12 12:00 |
16:32:33.66 |
+06:56:46.3 |
HIP 81026 |
7.57 |
| 2026-02-13 00:00 |
16:32:34.50 |
+06:57:10.6 |
HIP 81026 |
7.72 |
| 2026-02-13 12:00 |
16:32:35.31 |
+06:57:35.0 |
HIP 81026 |
7.89 |
| 2026-02-14 00:00 |
16:32:36.09 |
+06:57:59.6 |
HIP 81026 |
8.09 |
| 2026-02-14 12:00 |
16:32:36.84 |
+06:58:24.3 |
HIP 81026 |
8.32 |
| 2026-02-15 00:00 |
16:32:37.56 |
+06:58:49.2 |
HIP 81026 |
8.58 |
| 2026-02-15 12:00 |
16:32:38.24 |
+06:59:14.1 |
HIP 81026 |
8.85 |
| 2026-02-16 00:00 |
16:32:38.89 |
+06:59:39.2 |
HIP 81026 |
9.15 |
| 2026-02-16 12:00 |
16:32:39.51 |
+07:00:04.5 |
HIP 81026 |
9.46 |
| 2026-02-17 00:00 |
16:32:40.10 |
+07:00:29.8 |
HIP 81026 |
9.78 |
| 2026-02-17 12:00 |
16:32:40.65 |
+07:00:55.3 |
HIP 81026 |
10.12 |
| 2026-02-18 00:00 |
16:32:41.17 |
+07:01:20.9 |
HIP 81026 |
10.48 |
| 2026-02-18 12:00 |
16:32:41.66 |
+07:01:46.7 |
HIP 81026 |
10.84 |
| 2026-02-19 00:00 |
16:32:42.12 |
+07:02:12.5 |
HIP 81026 |
11.22 |
| 2026-02-19 12:00 |
16:32:42.54 |
+07:02:38.5 |
HIP 81026 |
11.60 |
| 2026-02-20 00:00 |
16:32:42.94 |
+07:03:04.5 |
HIP 81026 |
11.99 |
| 2026-02-20 12:00 |
16:32:43.29 |
+07:03:30.7 |
HIP 81026 |
12.39 |
| 2026-02-21 00:00 |
16:32:43.62 |
+07:03:57.0 |
HIP 81026 |
12.80 |
| 2026-02-21 12:00 |
16:32:43.91 |
+07:04:23.4 |
HIP 81026 |
13.21 |
| 2026-02-22 00:00 |
16:32:44.18 |
+07:04:50.0 |
HIP 81026 |
13.63 |
| 2026-02-22 12:00 |
16:32:44.40 |
+07:05:16.6 |
HIP 81026 |
14.05 |
| 2026-02-23 00:00 |
16:32:44.60 |
+07:05:43.3 |
HIP 81026 |
14.48 |
| 2026-02-23 12:00 |
16:32:44.76 |
+07:06:10.1 |
HIP 81026 |
14.91 |
| 2026-02-24 00:00 |
16:32:44.89 |
+07:06:37.0 |
HIP 81026 |
15.35 |