| Parameter |
Value |
| Designation |
C/2002 A1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-11-27T13:19:30.161280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:12Z |
| Obs used |
124 |
| NEO |
- |
| M1 |
8.200 |
| K1 |
11.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-06-06.0000000 |
| e |
0.72578378 |
| q (au) |
4.710957 |
| a (au) |
17.179715 |
| i (deg) |
14.057508 |
| Ω (om, deg) |
81.807737 |
| ω (w, deg) |
18.909060 |
| M (ma, deg) |
2.636023 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.195 + 3.997\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.195 |
| n |
3.997 |
| gf |
0.913 |
| gb |
-0.906 |
| k |
1.000 |
| δ90 |
3.686 |
| 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) |
| 2026-03-26 00:00 |
18:03:46.35 |
-25:21:07.7 |
HIP 88463 |
2.43 |
| 2026-03-26 12:00 |
18:03:46.56 |
-25:21:11.7 |
HIP 88463 |
2.51 |
| 2026-03-27 00:00 |
18:03:46.73 |
-25:21:15.7 |
HIP 88463 |
2.58 |
| 2026-03-27 12:00 |
18:03:46.86 |
-25:21:19.7 |
HIP 88463 |
2.65 |
| 2026-03-28 00:00 |
18:03:46.94 |
-25:21:23.7 |
HIP 88463 |
2.72 |
| 2026-03-28 12:00 |
18:03:46.98 |
-25:21:27.7 |
HIP 88463 |
2.79 |
| 2026-03-29 00:00 |
18:03:46.98 |
-25:21:31.7 |
HIP 88463 |
2.85 |
| 2026-03-29 12:00 |
18:03:46.94 |
-25:21:35.7 |
HIP 88463 |
2.92 |
| 2026-03-30 00:00 |
18:03:46.85 |
-25:21:39.8 |
HIP 88463 |
2.98 |
| 2026-03-30 12:00 |
18:03:46.72 |
-25:21:43.8 |
HIP 88463 |
3.04 |
| 2026-03-31 00:00 |
18:03:46.54 |
-25:21:47.8 |
HIP 88463 |
3.10 |
| 2026-03-31 12:00 |
18:03:46.33 |
-25:21:51.9 |
HIP 88463 |
3.15 |
| 2026-04-01 00:00 |
18:03:46.07 |
-25:21:55.9 |
HIP 88463 |
3.21 |
| 2026-04-01 12:00 |
18:03:45.77 |
-25:22:00.0 |
HIP 88463 |
3.27 |
| 2026-04-02 00:00 |
18:03:45.43 |
-25:22:04.0 |
HIP 88463 |
3.33 |
| 2026-04-02 12:00 |
18:03:45.04 |
-25:22:08.1 |
HIP 88463 |
3.39 |
| 2026-04-03 00:00 |
18:03:44.61 |
-25:22:12.1 |
HIP 88463 |
3.45 |
| 2026-04-03 12:00 |
18:03:44.14 |
-25:22:16.2 |
HIP 88463 |
3.52 |
| 2026-04-04 00:00 |
18:03:43.63 |
-25:22:20.2 |
HIP 88463 |
3.59 |
| 2026-04-04 12:00 |
18:03:43.08 |
-25:22:24.3 |
HIP 88463 |
3.66 |
| 2026-04-05 00:00 |
18:03:42.48 |
-25:22:28.3 |
HIP 88463 |
3.74 |
| 2026-04-05 12:00 |
18:03:41.84 |
-25:22:32.4 |
HIP 88463 |
3.82 |
| 2026-04-06 00:00 |
18:03:41.16 |
-25:22:36.4 |
HIP 88463 |
3.91 |
| 2026-04-06 12:00 |
18:03:40.43 |
-25:22:40.5 |
HIP 88463 |
4.01 |
| 2026-04-07 00:00 |
18:03:39.67 |
-25:22:44.6 |
HIP 88463 |
4.11 |
| 2026-04-07 12:00 |
18:03:38.86 |
-25:22:48.6 |
HIP 88463 |
4.23 |
| 2026-04-08 00:00 |
18:03:38.01 |
-25:22:52.7 |
HIP 88463 |
4.35 |
| 2026-04-08 12:00 |
18:03:37.12 |
-25:22:56.7 |
HIP 88463 |
4.48 |
| 2026-04-09 00:00 |
18:03:36.19 |
-25:23:00.8 |
HIP 88463 |
4.62 |
| 2026-04-09 12:00 |
18:03:35.21 |
-25:23:04.8 |
HIP 88463 |
4.77 |
| 2026-04-10 00:00 |
18:03:34.20 |
-25:23:08.9 |
HIP 88463 |
4.93 |
| 2026-04-10 12:00 |
18:03:33.14 |
-25:23:13.0 |
HIP 88463 |
5.10 |
| 2026-04-11 00:00 |
18:03:32.04 |
-25:23:17.0 |
HIP 88463 |
5.29 |
| 2026-04-11 12:00 |
18:03:30.90 |
-25:23:21.1 |
HIP 88463 |
5.48 |
| 2026-04-12 00:00 |
18:03:29.71 |
-25:23:25.1 |
HIP 88463 |
5.69 |
| 2026-04-12 12:00 |
18:03:28.49 |
-25:23:29.2 |
HIP 88463 |
5.90 |
| 2026-04-13 00:00 |
18:03:27.23 |
-25:23:33.2 |
HIP 88463 |
6.13 |
| 2026-04-13 12:00 |
18:03:25.92 |
-25:23:37.2 |
HIP 88463 |
6.37 |
| 2026-04-14 00:00 |
18:03:24.57 |
-25:23:41.3 |
HIP 88463 |
6.62 |
| 2026-04-14 12:00 |
18:03:23.19 |
-25:23:45.3 |
HIP 88463 |
6.88 |
| 2026-04-15 00:00 |
18:03:21.76 |
-25:23:49.4 |
HIP 88463 |
7.15 |
| 2026-04-15 12:00 |
18:03:20.29 |
-25:23:53.4 |
HIP 88463 |
7.44 |
| 2026-04-16 00:00 |
18:03:18.78 |
-25:23:57.4 |
HIP 88463 |
7.73 |