| Parameter |
Value |
| Designation |
C/2012 K5 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-11-28T16:30:24.831360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:09Z |
| Obs used |
4281 |
| NEO |
- |
| M1 |
12.800 |
| K1 |
5.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-10-15.0000000 |
| e |
0.99852650 |
| q (au) |
1.141811 |
| a (au) |
774.896185 |
| i (deg) |
92.848025 |
| Ω (om, deg) |
279.039021 |
| ω (w, deg) |
139.289759 |
| M (ma, deg) |
359.997958 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.248 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.248 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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 |
| 2012-05-06 |
2012-08-18 |
+8.9448 |
-3.462 |
| 2012-08-18 |
2012-11-25 |
+1.6210 |
-1.548 |
| 2012-11-29 |
2013-04-14 |
+6.6103 |
-0.571 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
22:44:54.09 |
-80:58:39.0 |
HIP 112092 |
6.66 |
| 2026-03-26 12:00 |
22:45:13.84 |
-80:58:55.6 |
HIP 112092 |
7.48 |
| 2026-03-27 00:00 |
22:45:33.52 |
-80:59:12.7 |
HIP 112092 |
8.30 |
| 2026-03-27 12:00 |
22:45:53.14 |
-80:59:30.1 |
HIP 112092 |
9.12 |
| 2026-03-28 00:00 |
22:46:12.69 |
-80:59:47.9 |
HIP 112092 |
9.94 |
| 2026-03-28 12:00 |
22:46:32.17 |
-81:00:06.1 |
HIP 112092 |
10.76 |
| 2026-03-29 00:00 |
22:46:51.59 |
-81:00:24.7 |
HIP 112092 |
11.58 |
| 2026-03-29 12:00 |
22:47:10.93 |
-81:00:43.7 |
HIP 112092 |
12.40 |
| 2026-03-30 00:00 |
22:47:30.21 |
-81:01:03.0 |
HIP 112092 |
13.22 |
| 2026-03-30 12:00 |
22:47:49.42 |
-81:01:22.8 |
HIP 112092 |
14.03 |
| 2026-03-31 00:00 |
22:48:08.56 |
-81:01:42.9 |
HIP 112092 |
14.85 |
| 2026-03-31 12:00 |
22:48:27.62 |
-81:02:03.5 |
HIP 112092 |
15.67 |
| 2026-04-01 00:00 |
22:48:46.61 |
-81:02:24.4 |
HIP 112092 |
16.48 |
| 2026-04-01 12:00 |
22:49:05.53 |
-81:02:45.7 |
HIP 112092 |
17.30 |
| 2026-04-02 00:00 |
22:49:24.38 |
-81:03:07.3 |
HIP 112092 |
18.11 |
| 2026-04-02 12:00 |
22:49:43.15 |
-81:03:29.4 |
HIP 113346 |
17.87 |
| 2026-04-03 00:00 |
22:50:01.85 |
-81:03:51.8 |
HIP 113346 |
17.09 |
| 2026-04-03 12:00 |
22:50:20.47 |
-81:04:14.7 |
HIP 113346 |
16.31 |
| 2026-04-04 00:00 |
22:50:39.01 |
-81:04:37.9 |
HIP 113346 |
15.54 |
| 2026-04-04 12:00 |
22:50:57.47 |
-81:05:01.4 |
HIP 113346 |
14.78 |
| 2026-04-05 00:00 |
22:51:15.86 |
-81:05:25.4 |
HIP 113346 |
14.03 |
| 2026-04-05 12:00 |
22:51:34.16 |
-81:05:49.7 |
HIP 113346 |
13.29 |
| 2026-04-06 00:00 |
22:51:52.39 |
-81:06:14.4 |
HIP 113346 |
12.57 |
| 2026-04-06 12:00 |
22:52:10.53 |
-81:06:39.5 |
HIP 113346 |
11.86 |
| 2026-04-07 00:00 |
22:52:28.59 |
-81:07:05.0 |
HIP 113346 |
11.17 |
| 2026-04-07 12:00 |
22:52:46.57 |
-81:07:30.8 |
HIP 113346 |
10.50 |
| 2026-04-08 00:00 |
22:53:04.46 |
-81:07:57.0 |
HIP 113346 |
9.86 |
| 2026-04-08 12:00 |
22:53:22.27 |
-81:08:23.6 |
HIP 113346 |
9.25 |
| 2026-04-09 00:00 |
22:53:39.99 |
-81:08:50.5 |
HIP 113346 |
8.69 |
| 2026-04-09 12:00 |
22:53:57.63 |
-81:09:17.9 |
HIP 113346 |
8.17 |
| 2026-04-10 00:00 |
22:54:15.17 |
-81:09:45.5 |
HIP 113346 |
7.71 |
| 2026-04-10 12:00 |
22:54:32.63 |
-81:10:13.6 |
HIP 113346 |
7.33 |
| 2026-04-11 00:00 |
22:54:49.99 |
-81:10:42.0 |
HIP 113346 |
7.02 |
| 2026-04-11 12:00 |
22:55:07.27 |
-81:11:10.8 |
HIP 113346 |
6.81 |
| 2026-04-12 00:00 |
22:55:24.45 |
-81:11:39.9 |
HIP 113346 |
6.70 |
| 2026-04-12 12:00 |
22:55:41.54 |
-81:12:09.4 |
HIP 113346 |
6.70 |
| 2026-04-13 00:00 |
22:55:58.53 |
-81:12:39.3 |
HIP 113346 |
6.80 |
| 2026-04-13 12:00 |
22:56:15.43 |
-81:13:09.5 |
HIP 113346 |
7.01 |
| 2026-04-14 00:00 |
22:56:32.23 |
-81:13:40.1 |
HIP 113346 |
7.31 |
| 2026-04-14 12:00 |
22:56:48.94 |
-81:14:11.1 |
HIP 113346 |
7.70 |
| 2026-04-15 00:00 |
22:57:05.54 |
-81:14:42.4 |
HIP 113346 |
8.15 |
| 2026-04-15 12:00 |
22:57:22.05 |
-81:15:14.0 |
HIP 113346 |
8.67 |
| 2026-04-16 00:00 |
22:57:38.45 |
-81:15:46.1 |
HIP 113346 |
9.24 |