| Parameter |
Value |
| Designation |
C/2002 K2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2002-01-05T20:02:48.010560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:16Z |
| Obs used |
136 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
11.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2002-06-25.0000000 |
| e |
0.99313694 |
| q (au) |
5.235061 |
| a (au) |
762.787805 |
| i (deg) |
130.895647 |
| Ω (om, deg) |
294.556678 |
| ω (w, deg) |
26.665091 |
| M (ma, deg) |
0.007961 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.268 + 3.515\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.268 |
| n |
3.515 |
| gf |
0.999 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.997 |
| 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 |
08:34:34.61 |
+29:07:14.0 |
HIP 42185 |
20.11 |
| 2026-07-29 12:00 |
08:34:37.39 |
+29:07:02.4 |
HIP 42185 |
19.48 |
| 2026-07-30 00:00 |
08:34:40.16 |
+29:06:51.0 |
HIP 42185 |
18.84 |
| 2026-07-30 12:00 |
08:34:42.93 |
+29:06:39.6 |
HIP 42185 |
18.21 |
| 2026-07-31 00:00 |
08:34:45.71 |
+29:06:28.2 |
HIP 42185 |
17.58 |
| 2026-07-31 12:00 |
08:34:48.48 |
+29:06:16.9 |
HIP 42185 |
16.94 |
| 2026-08-01 00:00 |
08:34:51.25 |
+29:06:05.7 |
HIP 42185 |
16.31 |
| 2026-08-01 12:00 |
08:34:54.02 |
+29:05:54.6 |
HIP 42185 |
15.68 |
| 2026-08-02 00:00 |
08:34:56.79 |
+29:05:43.5 |
HIP 42185 |
15.05 |
| 2026-08-02 12:00 |
08:34:59.56 |
+29:05:32.4 |
HIP 42185 |
14.42 |
| 2026-08-03 00:00 |
08:35:02.32 |
+29:05:21.4 |
HIP 42185 |
13.79 |
| 2026-08-03 12:00 |
08:35:05.08 |
+29:05:10.5 |
HIP 42185 |
13.16 |
| 2026-08-04 00:00 |
08:35:07.85 |
+29:04:59.7 |
HIP 42185 |
12.53 |
| 2026-08-04 12:00 |
08:35:10.61 |
+29:04:48.9 |
HIP 42185 |
11.90 |
| 2026-08-05 00:00 |
08:35:13.36 |
+29:04:38.2 |
HIP 42185 |
11.27 |
| 2026-08-05 12:00 |
08:35:16.12 |
+29:04:27.5 |
HIP 42185 |
10.65 |
| 2026-08-06 00:00 |
08:35:18.87 |
+29:04:16.9 |
HIP 42185 |
10.02 |
| 2026-08-06 12:00 |
08:35:21.62 |
+29:04:06.4 |
HIP 42185 |
9.40 |
| 2026-08-07 00:00 |
08:35:24.36 |
+29:03:56.0 |
HIP 42185 |
8.77 |
| 2026-08-07 12:00 |
08:35:27.10 |
+29:03:45.6 |
HIP 42185 |
8.15 |
| 2026-08-08 00:00 |
08:35:29.84 |
+29:03:35.3 |
HIP 42185 |
7.53 |
| 2026-08-08 12:00 |
08:35:32.58 |
+29:03:25.0 |
HIP 42185 |
6.91 |
| 2026-08-09 00:00 |
08:35:35.31 |
+29:03:14.8 |
HIP 42185 |
6.29 |
| 2026-08-09 12:00 |
08:35:38.03 |
+29:03:04.7 |
HIP 42185 |
5.68 |
| 2026-08-10 00:00 |
08:35:40.76 |
+29:02:54.7 |
HIP 42185 |
5.06 |
| 2026-08-10 12:00 |
08:35:43.47 |
+29:02:44.7 |
HIP 42185 |
4.45 |
| 2026-08-11 00:00 |
08:35:46.18 |
+29:02:34.8 |
HIP 42185 |
3.84 |
| 2026-08-11 12:00 |
08:35:48.89 |
+29:02:25.0 |
HIP 42185 |
3.23 |
| 2026-08-12 00:00 |
08:35:51.59 |
+29:02:15.3 |
HIP 42185 |
2.63 |
| 2026-08-12 12:00 |
08:35:54.29 |
+29:02:05.6 |
HIP 42185 |
2.04 |
| 2026-08-13 00:00 |
08:35:56.98 |
+29:01:56.0 |
HIP 42185 |
1.46 |
| 2026-08-13 12:00 |
08:35:59.67 |
+29:01:46.5 |
HIP 42185 |
0.92 |
| 2026-08-14 00:00 |
08:36:02.34 |
+29:01:37.1 |
HIP 42185 |
0.55 |
| 2026-08-14 12:00 |
08:36:05.02 |
+29:01:27.7 |
HIP 42185 |
0.70 |
| 2026-08-15 00:00 |
08:36:07.68 |
+29:01:18.5 |
HIP 42185 |
1.19 |
| 2026-08-15 12:00 |
08:36:10.34 |
+29:01:09.3 |
HIP 42185 |
1.75 |
| 2026-08-16 00:00 |
08:36:12.99 |
+29:01:00.1 |
HIP 42185 |
2.32 |
| 2026-08-16 12:00 |
08:36:15.64 |
+29:00:51.1 |
HIP 42185 |
2.91 |
| 2026-08-17 00:00 |
08:36:18.28 |
+29:00:42.1 |
HIP 42185 |
3.50 |
| 2026-08-17 12:00 |
08:36:20.91 |
+29:00:33.3 |
HIP 42185 |
4.08 |
| 2026-08-18 00:00 |
08:36:23.53 |
+29:00:24.5 |
HIP 42185 |
4.67 |
| 2026-08-18 12:00 |
08:36:26.14 |
+29:00:15.7 |
HIP 42185 |
5.26 |
| 2026-08-19 00:00 |
08:36:28.75 |
+29:00:07.1 |
HIP 42185 |
5.84 |