C/2002 A3 (LINEAR)
| 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) |
| 2026-02-03 00:00 |
17:20:22.87 |
+21:13:04.9 |
HIP 84877 |
18.91 |
| 2026-02-03 12:00 |
17:20:24.97 |
+21:13:26.5 |
HIP 84877 |
18.43 |
| 2026-02-04 00:00 |
17:20:27.05 |
+21:13:48.3 |
HIP 84877 |
17.95 |
| 2026-02-04 12:00 |
17:20:29.11 |
+21:14:10.2 |
HIP 84877 |
17.48 |
| 2026-02-05 00:00 |
17:20:31.15 |
+21:14:32.4 |
HIP 84877 |
17.01 |
| 2026-02-05 12:00 |
17:20:33.17 |
+21:14:54.7 |
HIP 84877 |
16.56 |
| 2026-02-06 00:00 |
17:20:35.17 |
+21:15:17.1 |
HIP 84877 |
16.10 |
| 2026-02-06 12:00 |
17:20:37.14 |
+21:15:39.8 |
HIP 84877 |
15.66 |
| 2026-02-07 00:00 |
17:20:39.09 |
+21:16:02.6 |
HIP 84877 |
15.23 |
| 2026-02-07 12:00 |
17:20:41.02 |
+21:16:25.6 |
HIP 84877 |
14.80 |
| 2026-02-08 00:00 |
17:20:42.93 |
+21:16:48.7 |
HIP 84877 |
14.38 |
| 2026-02-08 12:00 |
17:20:44.81 |
+21:17:12.0 |
HIP 84877 |
13.97 |
| 2026-02-09 00:00 |
17:20:46.67 |
+21:17:35.5 |
HIP 84877 |
13.58 |
| 2026-02-09 12:00 |
17:20:48.51 |
+21:17:59.1 |
HIP 84877 |
13.19 |
| 2026-02-10 00:00 |
17:20:50.33 |
+21:18:22.9 |
HIP 84877 |
12.82 |
| 2026-02-10 12:00 |
17:20:52.12 |
+21:18:46.8 |
HIP 84877 |
12.45 |
| 2026-02-11 00:00 |
17:20:53.89 |
+21:19:10.9 |
HIP 84877 |
12.11 |
| 2026-02-11 12:00 |
17:20:55.64 |
+21:19:35.1 |
HIP 84877 |
11.77 |
| 2026-02-12 00:00 |
17:20:57.36 |
+21:19:59.5 |
HIP 84877 |
11.45 |
| 2026-02-12 12:00 |
17:20:59.06 |
+21:20:24.0 |
HIP 84877 |
11.15 |
| 2026-02-13 00:00 |
17:21:00.73 |
+21:20:48.7 |
HIP 84877 |
10.86 |
| 2026-02-13 12:00 |
17:21:02.39 |
+21:21:13.5 |
HIP 84877 |
10.60 |
| 2026-02-14 00:00 |
17:21:04.01 |
+21:21:38.5 |
HIP 84877 |
10.35 |
| 2026-02-14 12:00 |
17:21:05.62 |
+21:22:03.6 |
HIP 84877 |
10.12 |
| 2026-02-15 00:00 |
17:21:07.19 |
+21:22:28.8 |
HIP 84877 |
9.92 |
| 2026-02-15 12:00 |
17:21:08.75 |
+21:22:54.2 |
HIP 84877 |
9.74 |
| 2026-02-16 00:00 |
17:21:10.28 |
+21:23:19.7 |
HIP 84877 |
9.58 |
| 2026-02-16 12:00 |
17:21:11.79 |
+21:23:45.4 |
HIP 84877 |
9.45 |
| 2026-02-17 00:00 |
17:21:13.27 |
+21:24:11.2 |
HIP 84877 |
9.34 |
| 2026-02-17 12:00 |
17:21:14.72 |
+21:24:37.1 |
HIP 84877 |
9.26 |
| 2026-02-18 00:00 |
17:21:16.15 |
+21:25:03.1 |
HIP 84877 |
9.20 |
| 2026-02-18 12:00 |
17:21:17.56 |
+21:25:29.2 |
HIP 84877 |
9.17 |
| 2026-02-19 00:00 |
17:21:18.94 |
+21:25:55.5 |
HIP 84877 |
9.17 |
| 2026-02-19 12:00 |
17:21:20.30 |
+21:26:21.9 |
HIP 84877 |
9.19 |
| 2026-02-20 00:00 |
17:21:21.63 |
+21:26:48.4 |
HIP 84877 |
9.24 |
| 2026-02-20 12:00 |
17:21:22.93 |
+21:27:15.0 |
HIP 84877 |
9.31 |
| 2026-02-21 00:00 |
17:21:24.21 |
+21:27:41.8 |
HIP 84877 |
9.41 |
| 2026-02-21 12:00 |
17:21:25.46 |
+21:28:08.6 |
HIP 84877 |
9.53 |
| 2026-02-22 00:00 |
17:21:26.69 |
+21:28:35.6 |
HIP 84877 |
9.67 |
| 2026-02-22 12:00 |
17:21:27.90 |
+21:29:02.6 |
HIP 84877 |
9.83 |
| 2026-02-23 00:00 |
17:21:29.07 |
+21:29:29.8 |
HIP 84877 |
10.02 |
| 2026-02-23 12:00 |
17:21:30.22 |
+21:29:57.0 |
HIP 84877 |
10.21 |
| 2026-02-24 00:00 |
17:21:31.35 |
+21:30:24.4 |
HIP 84877 |
10.43 |