| Parameter |
Value |
| Designation |
C/2005 K2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-07-05T09:27:35.389440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-16T12:09:59Z |
| Obs used |
13 |
| NEO |
- |
| M1 |
17.800 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-05-20.0000000 |
| e |
0.99999380 |
| q (au) |
0.544577 |
| a (au) |
87777.427104 |
| i (deg) |
102.045031 |
| Ω (om, deg) |
45.711970 |
| ω (w, deg) |
216.580465 |
| M (ma, deg) |
359.999998 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.756 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.756 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2005-05-19 |
2005-06-11 |
+24.1511 |
+1.942 |
| 2005-06-11 |
2005-06-27 |
-13.3690 |
-1.981 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
02:01:36.49 |
+36:25:27.5 |
HIP 9500 |
19.02 |
| 2026-06-01 12:00 |
02:01:38.95 |
+36:25:48.5 |
HIP 9500 |
18.51 |
| 2026-06-02 00:00 |
02:01:41.40 |
+36:26:09.7 |
HIP 9500 |
18.01 |
| 2026-06-02 12:00 |
02:01:43.83 |
+36:26:30.8 |
HIP 9500 |
17.51 |
| 2026-06-03 00:00 |
02:01:46.25 |
+36:26:52.0 |
HIP 9500 |
17.02 |
| 2026-06-03 12:00 |
02:01:48.65 |
+36:27:13.3 |
HIP 9500 |
16.53 |
| 2026-06-04 00:00 |
02:01:51.03 |
+36:27:34.6 |
HIP 9500 |
16.06 |
| 2026-06-04 12:00 |
02:01:53.40 |
+36:27:55.9 |
HIP 9500 |
15.59 |
| 2026-06-05 00:00 |
02:01:55.74 |
+36:28:17.2 |
HIP 9500 |
15.13 |
| 2026-06-05 12:00 |
02:01:58.08 |
+36:28:38.6 |
HIP 9500 |
14.68 |
| 2026-06-06 00:00 |
02:02:00.39 |
+36:29:00.1 |
HIP 9500 |
14.25 |
| 2026-06-06 12:00 |
02:02:02.69 |
+36:29:21.5 |
HIP 9500 |
13.82 |
| 2026-06-07 00:00 |
02:02:04.97 |
+36:29:43.0 |
HIP 9500 |
13.40 |
| 2026-06-07 12:00 |
02:02:07.23 |
+36:30:04.5 |
HIP 9500 |
13.00 |
| 2026-06-08 00:00 |
02:02:09.48 |
+36:30:26.1 |
HIP 9500 |
12.61 |
| 2026-06-08 12:00 |
02:02:11.70 |
+36:30:47.6 |
HIP 9500 |
12.24 |
| 2026-06-09 00:00 |
02:02:13.91 |
+36:31:09.2 |
HIP 9500 |
11.88 |
| 2026-06-09 12:00 |
02:02:16.10 |
+36:31:30.9 |
HIP 9500 |
11.53 |
| 2026-06-10 00:00 |
02:02:18.27 |
+36:31:52.5 |
HIP 9500 |
11.21 |
| 2026-06-10 12:00 |
02:02:20.42 |
+36:32:14.2 |
HIP 9500 |
10.90 |
| 2026-06-11 00:00 |
02:02:22.56 |
+36:32:35.9 |
HIP 9500 |
10.61 |
| 2026-06-11 12:00 |
02:02:24.67 |
+36:32:57.6 |
HIP 9500 |
10.34 |
| 2026-06-12 00:00 |
02:02:26.77 |
+36:33:19.3 |
HIP 9500 |
10.10 |
| 2026-06-12 12:00 |
02:02:28.85 |
+36:33:41.0 |
HIP 9500 |
9.88 |
| 2026-06-13 00:00 |
02:02:30.90 |
+36:34:02.8 |
HIP 9500 |
9.69 |
| 2026-06-13 12:00 |
02:02:32.94 |
+36:34:24.6 |
HIP 9500 |
9.52 |
| 2026-06-14 00:00 |
02:02:34.96 |
+36:34:46.3 |
HIP 9500 |
9.37 |
| 2026-06-14 12:00 |
02:02:36.96 |
+36:35:08.1 |
HIP 9500 |
9.26 |
| 2026-06-15 00:00 |
02:02:38.93 |
+36:35:29.9 |
HIP 9500 |
9.17 |
| 2026-06-15 12:00 |
02:02:40.89 |
+36:35:51.7 |
HIP 9500 |
9.11 |
| 2026-06-16 00:00 |
02:02:42.83 |
+36:36:13.5 |
HIP 9500 |
9.08 |
| 2026-06-16 12:00 |
02:02:44.74 |
+36:36:35.4 |
HIP 9500 |
9.08 |
| 2026-06-17 00:00 |
02:02:46.64 |
+36:36:57.2 |
HIP 9500 |
9.10 |
| 2026-06-17 12:00 |
02:02:48.51 |
+36:37:19.0 |
HIP 9500 |
9.16 |
| 2026-06-18 00:00 |
02:02:50.36 |
+36:37:40.8 |
HIP 9500 |
9.23 |
| 2026-06-18 12:00 |
02:02:52.20 |
+36:38:02.6 |
HIP 9500 |
9.34 |
| 2026-06-19 00:00 |
02:02:54.01 |
+36:38:24.5 |
HIP 9500 |
9.46 |
| 2026-06-19 12:00 |
02:02:55.79 |
+36:38:46.3 |
HIP 9500 |
9.61 |
| 2026-06-20 00:00 |
02:02:57.56 |
+36:39:08.1 |
HIP 9500 |
9.78 |
| 2026-06-20 12:00 |
02:02:59.31 |
+36:39:29.9 |
HIP 9500 |
9.96 |
| 2026-06-21 00:00 |
02:03:01.03 |
+36:39:51.7 |
HIP 9500 |
10.17 |
| 2026-06-21 12:00 |
02:03:02.73 |
+36:40:13.4 |
HIP 9500 |
10.39 |
| 2026-06-22 00:00 |
02:03:04.41 |
+36:40:35.2 |
HIP 9500 |
10.62 |