| Parameter |
Value |
| Designation |
C/2002 A3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-04-24T16:39:20.770560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:13Z |
| Obs used |
284 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
10.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-08-09.0000000 |
| e |
1.00944709 |
| q (au) |
5.151609 |
| a (au) |
-545.311986 |
| i (deg) |
48.082650 |
| Ω (om, deg) |
136.526383 |
| ω (w, deg) |
329.528821 |
| M (ma, deg) |
0.008228 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.473 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.473 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
10.000 |
| 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) |
| 2026-03-26 00:00 |
17:21:50.05 |
+21:59:22.6 |
HIP 85124 |
27.91 |
| 2026-03-26 12:00 |
17:21:49.53 |
+21:59:51.7 |
HIP 85124 |
28.11 |
| 2026-03-27 00:00 |
17:21:49.00 |
+22:00:20.8 |
HIP 85124 |
28.31 |
| 2026-03-27 12:00 |
17:21:48.43 |
+22:00:49.8 |
HIP 85124 |
28.53 |
| 2026-03-28 00:00 |
17:21:47.84 |
+22:01:18.8 |
HIP 85124 |
28.76 |
| 2026-03-28 12:00 |
17:21:47.23 |
+22:01:47.8 |
HIP 85124 |
29.01 |
| 2026-03-29 00:00 |
17:21:46.58 |
+22:02:16.6 |
HIP 85124 |
29.27 |
| 2026-03-29 12:00 |
17:21:45.92 |
+22:02:45.5 |
HIP 85124 |
29.54 |
| 2026-03-30 00:00 |
17:21:45.22 |
+22:03:14.2 |
HIP 85124 |
29.82 |
| 2026-03-30 12:00 |
17:21:44.50 |
+22:03:43.0 |
HIP 85124 |
30.11 |
| 2026-03-31 00:00 |
17:21:43.76 |
+22:04:11.6 |
HIP 85124 |
30.41 |
| 2026-03-31 12:00 |
17:21:42.98 |
+22:04:40.2 |
HIP 84768 |
30.60 |
| 2026-04-01 00:00 |
17:21:42.19 |
+22:05:08.7 |
HIP 84768 |
30.55 |
| 2026-04-01 12:00 |
17:21:41.36 |
+22:05:37.1 |
HIP 84768 |
30.50 |
| 2026-04-02 00:00 |
17:21:40.51 |
+22:06:05.5 |
HIP 84768 |
30.46 |
| 2026-04-02 12:00 |
17:21:39.64 |
+22:06:33.8 |
HIP 84768 |
30.42 |
| 2026-04-03 00:00 |
17:21:38.74 |
+22:07:02.1 |
HIP 84768 |
30.38 |
| 2026-04-03 12:00 |
17:21:37.81 |
+22:07:30.2 |
HIP 84768 |
30.34 |
| 2026-04-04 00:00 |
17:21:36.86 |
+22:07:58.3 |
HIP 84768 |
30.31 |
| 2026-04-04 12:00 |
17:21:35.89 |
+22:08:26.3 |
HIP 84768 |
30.28 |
| 2026-04-05 00:00 |
17:21:34.89 |
+22:08:54.2 |
HIP 84768 |
30.25 |
| 2026-04-05 12:00 |
17:21:33.86 |
+22:09:22.0 |
HIP 84768 |
30.23 |
| 2026-04-06 00:00 |
17:21:32.81 |
+22:09:49.8 |
HIP 84768 |
30.21 |
| 2026-04-06 12:00 |
17:21:31.74 |
+22:10:17.4 |
HIP 84768 |
30.19 |
| 2026-04-07 00:00 |
17:21:30.63 |
+22:10:45.0 |
HIP 84768 |
30.17 |
| 2026-04-07 12:00 |
17:21:29.51 |
+22:11:12.4 |
HIP 84768 |
30.16 |
| 2026-04-08 00:00 |
17:21:28.36 |
+22:11:39.8 |
HIP 84768 |
30.15 |
| 2026-04-08 12:00 |
17:21:27.19 |
+22:12:07.0 |
HIP 84768 |
30.15 |
| 2026-04-09 00:00 |
17:21:25.99 |
+22:12:34.2 |
HIP 84768 |
30.15 |
| 2026-04-09 12:00 |
17:21:24.76 |
+22:13:01.3 |
HIP 84768 |
30.15 |
| 2026-04-10 00:00 |
17:21:23.52 |
+22:13:28.2 |
HIP 84768 |
30.16 |
| 2026-04-10 12:00 |
17:21:22.25 |
+22:13:55.1 |
HIP 84768 |
30.17 |
| 2026-04-11 00:00 |
17:21:20.95 |
+22:14:21.8 |
HIP 84768 |
30.19 |
| 2026-04-11 12:00 |
17:21:19.63 |
+22:14:48.4 |
HIP 84768 |
30.21 |
| 2026-04-12 00:00 |
17:21:18.29 |
+22:15:14.9 |
HIP 84768 |
30.23 |
| 2026-04-12 12:00 |
17:21:16.92 |
+22:15:41.3 |
HIP 84768 |
30.26 |
| 2026-04-13 00:00 |
17:21:15.53 |
+22:16:07.6 |
HIP 84768 |
30.29 |
| 2026-04-13 12:00 |
17:21:14.12 |
+22:16:33.8 |
HIP 84768 |
30.32 |
| 2026-04-14 00:00 |
17:21:12.68 |
+22:16:59.8 |
HIP 84768 |
30.36 |
| 2026-04-14 12:00 |
17:21:11.22 |
+22:17:25.7 |
HIP 84768 |
30.41 |
| 2026-04-15 00:00 |
17:21:09.73 |
+22:17:51.5 |
HIP 84768 |
30.46 |
| 2026-04-15 12:00 |
17:21:08.23 |
+22:18:17.1 |
HIP 84768 |
30.51 |
| 2026-04-16 00:00 |
17:21:06.70 |
+22:18:42.7 |
HIP 84768 |
30.57 |