| 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) |
| 2026-09-20 00:00 |
02:01:11.79 |
+37:22:08.3 |
HIP 9507 |
13.33 |
| 2026-09-20 12:00 |
02:01:09.00 |
+37:22:08.4 |
HIP 9507 |
13.89 |
| 2026-09-21 00:00 |
02:01:06.19 |
+37:22:08.3 |
HIP 9507 |
14.45 |
| 2026-09-21 12:00 |
02:01:03.36 |
+37:22:08.0 |
HIP 9507 |
15.01 |
| 2026-09-22 00:00 |
02:01:00.52 |
+37:22:07.5 |
HIP 9507 |
15.57 |
| 2026-09-22 12:00 |
02:00:57.66 |
+37:22:06.8 |
HIP 9507 |
16.14 |
| 2026-09-23 00:00 |
02:00:54.78 |
+37:22:06.0 |
HIP 9507 |
16.71 |
| 2026-09-23 12:00 |
02:00:51.89 |
+37:22:04.9 |
HIP 9507 |
17.29 |
| 2026-09-24 00:00 |
02:00:48.99 |
+37:22:03.6 |
HIP 9507 |
17.86 |
| 2026-09-24 12:00 |
02:00:46.07 |
+37:22:02.2 |
HIP 9507 |
18.44 |
| 2026-09-25 00:00 |
02:00:43.13 |
+37:22:00.5 |
HIP 9507 |
19.03 |
| 2026-09-25 12:00 |
02:00:40.18 |
+37:21:58.7 |
HIP 9507 |
19.61 |
| 2026-09-26 00:00 |
02:00:37.21 |
+37:21:56.6 |
HIP 9507 |
20.20 |
| 2026-09-26 12:00 |
02:00:34.23 |
+37:21:54.4 |
HIP 9507 |
20.79 |
| 2026-09-27 00:00 |
02:00:31.23 |
+37:21:52.0 |
HIP 9507 |
21.39 |
| 2026-09-27 12:00 |
02:00:28.22 |
+37:21:49.3 |
HIP 9507 |
21.98 |
| 2026-09-28 00:00 |
02:00:25.20 |
+37:21:46.5 |
HIP 9507 |
22.59 |
| 2026-09-28 12:00 |
02:00:22.16 |
+37:21:43.5 |
HIP 9507 |
23.19 |
| 2026-09-29 00:00 |
02:00:19.11 |
+37:21:40.3 |
HIP 9507 |
23.79 |
| 2026-09-29 12:00 |
02:00:16.05 |
+37:21:36.9 |
HIP 9507 |
24.40 |
| 2026-09-30 00:00 |
02:00:12.97 |
+37:21:33.3 |
HIP 9507 |
25.02 |
| 2026-09-30 12:00 |
02:00:09.88 |
+37:21:29.5 |
HIP 9507 |
25.63 |
| 2026-10-01 00:00 |
02:00:06.78 |
+37:21:25.6 |
HIP 9507 |
26.25 |
| 2026-10-01 12:00 |
02:00:03.67 |
+37:21:21.4 |
HIP 9507 |
26.87 |
| 2026-10-02 00:00 |
02:00:00.54 |
+37:21:17.0 |
HIP 9507 |
27.49 |
| 2026-10-02 12:00 |
01:59:57.40 |
+37:21:12.5 |
HIP 9507 |
28.11 |
| 2026-10-03 00:00 |
01:59:54.25 |
+37:21:07.7 |
HIP 9507 |
28.74 |
| 2026-10-03 12:00 |
01:59:51.09 |
+37:21:02.8 |
HIP 9507 |
29.37 |
| 2026-10-04 00:00 |
01:59:47.92 |
+37:20:57.7 |
HIP 9507 |
30.00 |
| 2026-10-04 12:00 |
01:59:44.74 |
+37:20:52.3 |
HIP 9245 |
29.90 |
| 2026-10-05 00:00 |
01:59:41.54 |
+37:20:46.8 |
HIP 9245 |
29.78 |
| 2026-10-05 12:00 |
01:59:38.34 |
+37:20:41.1 |
HIP 9245 |
29.67 |
| 2026-10-06 00:00 |
01:59:35.12 |
+37:20:35.2 |
HIP 9245 |
29.58 |
| 2026-10-06 12:00 |
01:59:31.90 |
+37:20:29.1 |
HIP 9245 |
29.50 |
| 2026-10-07 00:00 |
01:59:28.66 |
+37:20:22.8 |
HIP 9245 |
29.44 |
| 2026-10-07 12:00 |
01:59:25.42 |
+37:20:16.4 |
HIP 9245 |
29.40 |
| 2026-10-08 00:00 |
01:59:22.17 |
+37:20:09.7 |
HIP 9245 |
29.37 |
| 2026-10-08 12:00 |
01:59:18.90 |
+37:20:02.8 |
HIP 9245 |
29.36 |
| 2026-10-09 00:00 |
01:59:15.63 |
+37:19:55.8 |
HIP 9245 |
29.37 |
| 2026-10-09 12:00 |
01:59:12.35 |
+37:19:48.6 |
HIP 9245 |
29.40 |
| 2026-10-10 00:00 |
01:59:09.07 |
+37:19:41.1 |
HIP 9245 |
29.44 |
| 2026-10-10 12:00 |
01:59:05.77 |
+37:19:33.5 |
HIP 9245 |
29.51 |
| 2026-10-11 00:00 |
01:59:02.47 |
+37:19:25.7 |
HIP 9245 |
29.59 |