C/2005 K2 (LINEAR)
| 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 |
2005-06-12 |
+22.7905 |
+1.901 |
| 2005-06-12 |
2005-06-27 |
-12.9234 |
-1.919 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
01:51:44.17 |
+36:00:01.5 |
HIP 8581 |
12.39 |
| 2026-02-03 12:00 |
01:51:44.92 |
+35:59:48.3 |
HIP 8581 |
12.59 |
| 2026-02-04 00:00 |
01:51:45.69 |
+35:59:35.3 |
HIP 8581 |
12.80 |
| 2026-02-04 12:00 |
01:51:46.49 |
+35:59:22.4 |
HIP 8581 |
13.01 |
| 2026-02-05 00:00 |
01:51:47.31 |
+35:59:09.7 |
HIP 8581 |
13.23 |
| 2026-02-05 12:00 |
01:51:48.16 |
+35:58:57.2 |
HIP 8581 |
13.46 |
| 2026-02-06 00:00 |
01:51:49.04 |
+35:58:44.8 |
HIP 8581 |
13.70 |
| 2026-02-06 12:00 |
01:51:49.95 |
+35:58:32.5 |
HIP 8591 |
13.93 |
| 2026-02-07 00:00 |
01:51:50.89 |
+35:58:20.5 |
HIP 8591 |
13.98 |
| 2026-02-07 12:00 |
01:51:51.85 |
+35:58:08.6 |
HIP 8591 |
14.04 |
| 2026-02-08 00:00 |
01:51:52.83 |
+35:57:56.8 |
HIP 8591 |
14.10 |
| 2026-02-08 12:00 |
01:51:53.85 |
+35:57:45.3 |
HIP 8591 |
14.18 |
| 2026-02-09 00:00 |
01:51:54.89 |
+35:57:33.9 |
HIP 8591 |
14.28 |
| 2026-02-09 12:00 |
01:51:55.96 |
+35:57:22.7 |
HIP 8591 |
14.38 |
| 2026-02-10 00:00 |
01:51:57.05 |
+35:57:11.6 |
HIP 8591 |
14.49 |
| 2026-02-10 12:00 |
01:51:58.18 |
+35:57:00.7 |
HIP 8591 |
14.62 |
| 2026-02-11 00:00 |
01:51:59.32 |
+35:56:50.0 |
HIP 8591 |
14.75 |
| 2026-02-11 12:00 |
01:52:00.50 |
+35:56:39.5 |
HIP 8591 |
14.90 |
| 2026-02-12 00:00 |
01:52:01.70 |
+35:56:29.1 |
HIP 8591 |
15.05 |
| 2026-02-12 12:00 |
01:52:02.92 |
+35:56:18.9 |
HIP 8591 |
15.22 |
| 2026-02-13 00:00 |
01:52:04.17 |
+35:56:08.9 |
HIP 8591 |
15.40 |
| 2026-02-13 12:00 |
01:52:05.45 |
+35:55:59.0 |
HIP 8591 |
15.58 |
| 2026-02-14 00:00 |
01:52:06.75 |
+35:55:49.4 |
HIP 8591 |
15.78 |
| 2026-02-14 12:00 |
01:52:08.08 |
+35:55:39.9 |
HIP 8591 |
15.98 |
| 2026-02-15 00:00 |
01:52:09.44 |
+35:55:30.6 |
HIP 8591 |
16.20 |
| 2026-02-15 12:00 |
01:52:10.82 |
+35:55:21.4 |
HIP 8591 |
16.42 |
| 2026-02-16 00:00 |
01:52:12.22 |
+35:55:12.5 |
HIP 8673 |
16.56 |
| 2026-02-16 12:00 |
01:52:13.65 |
+35:55:03.7 |
HIP 8673 |
16.54 |
| 2026-02-17 00:00 |
01:52:15.10 |
+35:54:55.1 |
HIP 8673 |
16.54 |
| 2026-02-17 12:00 |
01:52:16.58 |
+35:54:46.7 |
HIP 8673 |
16.54 |
| 2026-02-18 00:00 |
01:52:18.09 |
+35:54:38.5 |
HIP 8673 |
16.56 |
| 2026-02-18 12:00 |
01:52:19.62 |
+35:54:30.4 |
HIP 8673 |
16.58 |
| 2026-02-19 00:00 |
01:52:21.17 |
+35:54:22.5 |
HIP 8673 |
16.62 |
| 2026-02-19 12:00 |
01:52:22.74 |
+35:54:14.9 |
HIP 8673 |
16.68 |
| 2026-02-20 00:00 |
01:52:24.35 |
+35:54:07.4 |
HIP 8673 |
16.74 |
| 2026-02-20 12:00 |
01:52:25.97 |
+35:54:00.0 |
HIP 8673 |
16.82 |
| 2026-02-21 00:00 |
01:52:27.62 |
+35:53:52.9 |
HIP 8673 |
16.91 |
| 2026-02-21 12:00 |
01:52:29.29 |
+35:53:45.9 |
HIP 8673 |
17.01 |
| 2026-02-22 00:00 |
01:52:30.98 |
+35:53:39.2 |
HIP 8673 |
17.12 |
| 2026-02-22 12:00 |
01:52:32.70 |
+35:53:32.6 |
HIP 8673 |
17.24 |
| 2026-02-23 00:00 |
01:52:34.44 |
+35:53:26.2 |
HIP 8673 |
17.38 |
| 2026-02-23 12:00 |
01:52:36.21 |
+35:53:20.0 |
HIP 8673 |
17.53 |
| 2026-02-24 00:00 |
01:52:37.99 |
+35:53:13.9 |
HIP 8673 |
17.69 |