| Parameter |
Value |
| Designation |
C/2000 K2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-10-11T08:50:10.268160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:04Z |
| Obs used |
315 |
| NEO |
- |
| M1 |
12.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-01-24.0000000 |
| e |
0.99533458 |
| q (au) |
2.437066 |
| a (au) |
522.368250 |
| i (deg) |
25.633558 |
| Ω (om, deg) |
195.261038 |
| ω (w, deg) |
106.826472 |
| M (ma, deg) |
0.008638 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.118 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.118 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.947 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2000-05-04 |
2000-10-07 |
+29.0488 |
-11.898 |
| 2000-10-14 |
2003-01-16 |
+4.6075 |
-3.437 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
06:15:00.93 |
-01:29:55.3 |
HIP 29706 |
8.78 |
| 2026-05-12 12:00 |
06:15:02.89 |
-01:29:45.4 |
HIP 29706 |
8.31 |
| 2026-05-13 00:00 |
06:15:04.87 |
-01:29:35.6 |
HIP 29706 |
7.84 |
| 2026-05-13 12:00 |
06:15:06.87 |
-01:29:25.9 |
HIP 29706 |
7.38 |
| 2026-05-14 00:00 |
06:15:08.87 |
-01:29:16.3 |
HIP 29706 |
6.93 |
| 2026-05-14 12:00 |
06:15:10.89 |
-01:29:06.8 |
HIP 29706 |
6.49 |
| 2026-05-15 00:00 |
06:15:12.92 |
-01:28:57.4 |
HIP 29706 |
6.06 |
| 2026-05-15 12:00 |
06:15:14.97 |
-01:28:48.2 |
HIP 29706 |
5.65 |
| 2026-05-16 00:00 |
06:15:17.03 |
-01:28:39.0 |
HIP 29706 |
5.27 |
| 2026-05-16 12:00 |
06:15:19.10 |
-01:28:30.0 |
HIP 29706 |
4.91 |
| 2026-05-17 00:00 |
06:15:21.19 |
-01:28:21.1 |
HIP 29706 |
4.59 |
| 2026-05-17 12:00 |
06:15:23.28 |
-01:28:12.3 |
HIP 29706 |
4.31 |
| 2026-05-18 00:00 |
06:15:25.39 |
-01:28:03.6 |
HIP 29706 |
4.09 |
| 2026-05-18 12:00 |
06:15:27.51 |
-01:27:55.0 |
HIP 29706 |
3.93 |
| 2026-05-19 00:00 |
06:15:29.65 |
-01:27:46.6 |
HIP 29706 |
3.85 |
| 2026-05-19 12:00 |
06:15:31.79 |
-01:27:38.2 |
HIP 29706 |
3.85 |
| 2026-05-20 00:00 |
06:15:33.95 |
-01:27:30.0 |
HIP 29706 |
3.94 |
| 2026-05-20 12:00 |
06:15:36.12 |
-01:27:21.9 |
HIP 29706 |
4.10 |
| 2026-05-21 00:00 |
06:15:38.30 |
-01:27:13.9 |
HIP 29706 |
4.33 |
| 2026-05-21 12:00 |
06:15:40.49 |
-01:27:06.0 |
HIP 29706 |
4.62 |
| 2026-05-22 00:00 |
06:15:42.69 |
-01:26:58.3 |
HIP 29706 |
4.96 |
| 2026-05-22 12:00 |
06:15:44.91 |
-01:26:50.6 |
HIP 29706 |
5.35 |
| 2026-05-23 00:00 |
06:15:47.13 |
-01:26:43.1 |
HIP 29706 |
5.76 |
| 2026-05-23 12:00 |
06:15:49.37 |
-01:26:35.7 |
HIP 29706 |
6.21 |
| 2026-05-24 00:00 |
06:15:51.61 |
-01:26:28.5 |
HIP 29706 |
6.67 |
| 2026-05-24 12:00 |
06:15:53.87 |
-01:26:21.3 |
HIP 29706 |
7.16 |
| 2026-05-25 00:00 |
06:15:56.13 |
-01:26:14.3 |
HIP 29706 |
7.66 |
| 2026-05-25 12:00 |
06:15:58.41 |
-01:26:07.3 |
HIP 29706 |
8.18 |
| 2026-05-26 00:00 |
06:16:00.69 |
-01:26:00.6 |
HIP 29706 |
8.70 |
| 2026-05-26 12:00 |
06:16:02.99 |
-01:25:53.9 |
HIP 29706 |
9.24 |
| 2026-05-27 00:00 |
06:16:05.29 |
-01:25:47.3 |
HIP 29706 |
9.78 |
| 2026-05-27 12:00 |
06:16:07.61 |
-01:25:40.9 |
HIP 29706 |
10.33 |
| 2026-05-28 00:00 |
06:16:09.93 |
-01:25:34.6 |
HIP 29706 |
10.89 |
| 2026-05-28 12:00 |
06:16:12.26 |
-01:25:28.4 |
HIP 29706 |
11.45 |
| 2026-05-29 00:00 |
06:16:14.61 |
-01:25:22.4 |
HIP 29706 |
12.02 |
| 2026-05-29 12:00 |
06:16:16.96 |
-01:25:16.4 |
HIP 29706 |
12.59 |
| 2026-05-30 00:00 |
06:16:19.32 |
-01:25:10.6 |
HIP 29706 |
13.17 |
| 2026-05-30 12:00 |
06:16:21.68 |
-01:25:04.9 |
HIP 29706 |
13.75 |
| 2026-05-31 00:00 |
06:16:24.06 |
-01:24:59.4 |
HIP 29706 |
14.34 |
| 2026-05-31 12:00 |
06:16:26.44 |
-01:24:53.9 |
HIP 29706 |
14.93 |
| 2026-06-01 00:00 |
06:16:28.83 |
-01:24:48.6 |
HIP 29706 |
15.52 |
| 2026-06-01 12:00 |
06:16:31.23 |
-01:24:43.5 |
HIP 29706 |
16.11 |
| 2026-06-02 00:00 |
06:16:33.64 |
-01:24:38.4 |
HIP 29706 |
16.71 |