C/2002 A1 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
17:59:52.96 |
-25:15:00.5 |
HIP 88049 |
12.12 |
| 2026-02-03 12:00 |
17:59:57.03 |
-25:15:03.7 |
HIP 88049 |
13.01 |
| 2026-02-04 00:00 |
18:00:01.07 |
-25:15:06.9 |
HIP 88049 |
13.90 |
| 2026-02-04 12:00 |
18:00:05.08 |
-25:15:10.0 |
HIP 88049 |
14.79 |
| 2026-02-05 00:00 |
18:00:09.06 |
-25:15:13.2 |
HIP 88049 |
15.68 |
| 2026-02-05 12:00 |
18:00:13.02 |
-25:15:16.4 |
HIP 88049 |
16.56 |
| 2026-02-06 00:00 |
18:00:16.94 |
-25:15:19.7 |
HIP 88049 |
17.43 |
| 2026-02-06 12:00 |
18:00:20.84 |
-25:15:22.9 |
HIP 88049 |
18.30 |
| 2026-02-07 00:00 |
18:00:24.70 |
-25:15:26.1 |
HIP 88049 |
19.17 |
| 2026-02-07 12:00 |
18:00:28.54 |
-25:15:29.3 |
HIP 88049 |
20.03 |
| 2026-02-08 00:00 |
18:00:32.34 |
-25:15:32.6 |
HIP 88049 |
20.88 |
| 2026-02-08 12:00 |
18:00:36.12 |
-25:15:35.8 |
HIP 88049 |
21.73 |
| 2026-02-09 00:00 |
18:00:39.86 |
-25:15:39.1 |
HIP 88049 |
22.57 |
| 2026-02-09 12:00 |
18:00:43.57 |
-25:15:42.4 |
HIP 88049 |
23.41 |
| 2026-02-10 00:00 |
18:00:47.26 |
-25:15:45.6 |
HIP 88049 |
24.24 |
| 2026-02-10 12:00 |
18:00:50.91 |
-25:15:48.9 |
HIP 88049 |
25.06 |
| 2026-02-11 00:00 |
18:00:54.53 |
-25:15:52.2 |
HIP 88292 |
24.72 |
| 2026-02-11 12:00 |
18:00:58.11 |
-25:15:55.5 |
HIP 88292 |
24.29 |
| 2026-02-12 00:00 |
18:01:01.67 |
-25:15:58.8 |
HIP 88292 |
23.89 |
| 2026-02-12 12:00 |
18:01:05.19 |
-25:16:02.1 |
HIP 88292 |
23.51 |
| 2026-02-13 00:00 |
18:01:08.68 |
-25:16:05.5 |
HIP 88292 |
23.16 |
| 2026-02-13 12:00 |
18:01:12.14 |
-25:16:08.8 |
HIP 88292 |
22.83 |
| 2026-02-14 00:00 |
18:01:15.56 |
-25:16:12.1 |
HIP 88292 |
22.52 |
| 2026-02-14 12:00 |
18:01:18.95 |
-25:16:15.5 |
HIP 88292 |
22.24 |
| 2026-02-15 00:00 |
18:01:22.31 |
-25:16:18.8 |
HIP 88292 |
21.98 |
| 2026-02-15 12:00 |
18:01:25.63 |
-25:16:22.2 |
HIP 88292 |
21.75 |
| 2026-02-16 00:00 |
18:01:28.92 |
-25:16:25.6 |
HIP 88292 |
21.54 |
| 2026-02-16 12:00 |
18:01:32.17 |
-25:16:29.0 |
HIP 88292 |
21.36 |
| 2026-02-17 00:00 |
18:01:35.39 |
-25:16:32.4 |
HIP 88292 |
21.20 |
| 2026-02-17 12:00 |
18:01:38.58 |
-25:16:35.8 |
HIP 88292 |
21.07 |
| 2026-02-18 00:00 |
18:01:41.73 |
-25:16:39.2 |
HIP 88292 |
20.96 |
| 2026-02-18 12:00 |
18:01:44.84 |
-25:16:42.6 |
HIP 88292 |
20.88 |
| 2026-02-19 00:00 |
18:01:47.92 |
-25:16:46.0 |
HIP 88292 |
20.82 |
| 2026-02-19 12:00 |
18:01:50.97 |
-25:16:49.5 |
HIP 88292 |
20.78 |
| 2026-02-20 00:00 |
18:01:53.97 |
-25:16:52.9 |
HIP 88292 |
20.76 |
| 2026-02-20 12:00 |
18:01:56.94 |
-25:16:56.4 |
HIP 88292 |
20.77 |
| 2026-02-21 00:00 |
18:01:59.88 |
-25:16:59.8 |
HIP 88292 |
20.80 |
| 2026-02-21 12:00 |
18:02:02.78 |
-25:17:03.3 |
HIP 88292 |
20.84 |
| 2026-02-22 00:00 |
18:02:05.64 |
-25:17:06.8 |
HIP 88292 |
20.91 |
| 2026-02-22 12:00 |
18:02:08.46 |
-25:17:10.3 |
HIP 88292 |
20.99 |
| 2026-02-23 00:00 |
18:02:11.25 |
-25:17:13.8 |
HIP 88463 |
21.04 |
| 2026-02-23 12:00 |
18:02:14.00 |
-25:17:17.3 |
HIP 88463 |
20.41 |
| 2026-02-24 00:00 |
18:02:16.72 |
-25:17:20.8 |
HIP 88463 |
19.80 |