| 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) |
| 2026-07-29 00:00 |
16:17:58.44 |
+08:06:41.5 |
HIP 79827 |
23.27 |
| 2026-07-29 12:00 |
16:17:56.33 |
+08:06:21.7 |
HIP 79827 |
22.84 |
| 2026-07-30 00:00 |
16:17:54.25 |
+08:06:01.7 |
HIP 79827 |
22.41 |
| 2026-07-30 12:00 |
16:17:52.20 |
+08:05:41.5 |
HIP 79827 |
21.98 |
| 2026-07-31 00:00 |
16:17:50.18 |
+08:05:21.2 |
HIP 79827 |
21.57 |
| 2026-07-31 12:00 |
16:17:48.18 |
+08:05:00.6 |
HIP 79737 |
21.04 |
| 2026-08-01 00:00 |
16:17:46.22 |
+08:04:40.0 |
HIP 79737 |
20.52 |
| 2026-08-01 12:00 |
16:17:44.28 |
+08:04:19.1 |
HIP 79737 |
20.00 |
| 2026-08-02 00:00 |
16:17:42.37 |
+08:03:58.2 |
HIP 79737 |
19.50 |
| 2026-08-02 12:00 |
16:17:40.50 |
+08:03:37.0 |
HIP 79737 |
19.00 |
| 2026-08-03 00:00 |
16:17:38.65 |
+08:03:15.7 |
HIP 79737 |
18.52 |
| 2026-08-03 12:00 |
16:17:36.82 |
+08:02:54.2 |
HIP 79737 |
18.06 |
| 2026-08-04 00:00 |
16:17:35.03 |
+08:02:32.6 |
HIP 79737 |
17.60 |
| 2026-08-04 12:00 |
16:17:33.27 |
+08:02:10.8 |
HIP 79737 |
17.16 |
| 2026-08-05 00:00 |
16:17:31.54 |
+08:01:48.9 |
HIP 79737 |
16.74 |
| 2026-08-05 12:00 |
16:17:29.83 |
+08:01:26.8 |
HIP 79737 |
16.33 |
| 2026-08-06 00:00 |
16:17:28.16 |
+08:01:04.6 |
HIP 79737 |
15.93 |
| 2026-08-06 12:00 |
16:17:26.52 |
+08:00:42.2 |
HIP 79737 |
15.56 |
| 2026-08-07 00:00 |
16:17:24.90 |
+08:00:19.7 |
HIP 79737 |
15.20 |
| 2026-08-07 12:00 |
16:17:23.32 |
+07:59:57.0 |
HIP 79737 |
14.86 |
| 2026-08-08 00:00 |
16:17:21.77 |
+07:59:34.2 |
HIP 79737 |
14.55 |
| 2026-08-08 12:00 |
16:17:20.24 |
+07:59:11.3 |
HIP 79737 |
14.25 |
| 2026-08-09 00:00 |
16:17:18.75 |
+07:58:48.2 |
HIP 79737 |
13.98 |
| 2026-08-09 12:00 |
16:17:17.29 |
+07:58:25.0 |
HIP 79737 |
13.73 |
| 2026-08-10 00:00 |
16:17:15.86 |
+07:58:01.6 |
HIP 79737 |
13.50 |
| 2026-08-10 12:00 |
16:17:14.45 |
+07:57:38.1 |
HIP 79737 |
13.30 |
| 2026-08-11 00:00 |
16:17:13.08 |
+07:57:14.5 |
HIP 79737 |
13.12 |
| 2026-08-11 12:00 |
16:17:11.74 |
+07:56:50.8 |
HIP 79737 |
12.97 |
| 2026-08-12 00:00 |
16:17:10.43 |
+07:56:26.9 |
HIP 79737 |
12.85 |
| 2026-08-12 12:00 |
16:17:09.16 |
+07:56:02.9 |
HIP 79737 |
12.75 |
| 2026-08-13 00:00 |
16:17:07.91 |
+07:55:38.8 |
HIP 79737 |
12.68 |
| 2026-08-13 12:00 |
16:17:06.69 |
+07:55:14.5 |
HIP 79737 |
12.64 |
| 2026-08-14 00:00 |
16:17:05.51 |
+07:54:50.1 |
HIP 79737 |
12.63 |
| 2026-08-14 12:00 |
16:17:04.35 |
+07:54:25.6 |
HIP 79737 |
12.64 |
| 2026-08-15 00:00 |
16:17:03.23 |
+07:54:01.0 |
HIP 79737 |
12.69 |
| 2026-08-15 12:00 |
16:17:02.14 |
+07:53:36.3 |
HIP 79737 |
12.75 |
| 2026-08-16 00:00 |
16:17:01.08 |
+07:53:11.5 |
HIP 79752 |
12.45 |
| 2026-08-16 12:00 |
16:17:00.05 |
+07:52:46.6 |
HIP 79752 |
11.96 |
| 2026-08-17 00:00 |
16:16:59.05 |
+07:52:21.5 |
HIP 79752 |
11.48 |
| 2026-08-17 12:00 |
16:16:58.09 |
+07:51:56.4 |
HIP 79752 |
11.00 |
| 2026-08-18 00:00 |
16:16:57.15 |
+07:51:31.1 |
HIP 79752 |
10.52 |
| 2026-08-18 12:00 |
16:16:56.25 |
+07:51:05.7 |
HIP 79752 |
10.04 |
| 2026-08-19 00:00 |
16:16:55.38 |
+07:50:40.3 |
HIP 79752 |
9.57 |