| Parameter |
Value |
| Designation |
C/2012 K1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-08-27T15:50:55.363200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:09Z |
| Obs used |
7829 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
6.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2014-02-09.0000000 |
| e |
1.00015292 |
| q (au) |
1.054597 |
| a (au) |
-6896.600671 |
| i (deg) |
142.428258 |
| Ω (om, deg) |
317.737649 |
| ω (w, deg) |
203.106601 |
| M (ma, deg) |
-0.000344 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.414 + 2.385\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.414 |
| n |
2.385 |
| gf |
1.000 |
| gb |
-0.794 |
| k |
0.800 |
| 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 |
| 2012-05-14 |
2014-07-17 |
+1.6909 |
-1.293 |
| 2014-08-31 |
2014-10-31 |
+17.6020 |
-4.109 |
| 2014-10-31 |
2016-08-07 |
+3.7225 |
-1.211 |
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 |
21:12:03.57 |
-15:33:58.5 |
HIP 104713 |
19.23 |
| 2026-09-20 12:00 |
21:12:00.28 |
-15:34:11.6 |
HIP 104713 |
19.43 |
| 2026-09-21 00:00 |
21:11:57.01 |
-15:34:24.6 |
HIP 104713 |
19.66 |
| 2026-09-21 12:00 |
21:11:53.77 |
-15:34:37.4 |
HIP 104713 |
19.92 |
| 2026-09-22 00:00 |
21:11:50.56 |
-15:34:50.2 |
HIP 104713 |
20.20 |
| 2026-09-22 12:00 |
21:11:47.37 |
-15:35:02.8 |
HIP 104713 |
20.51 |
| 2026-09-23 00:00 |
21:11:44.21 |
-15:35:15.4 |
HIP 104713 |
20.85 |
| 2026-09-23 12:00 |
21:11:41.07 |
-15:35:27.8 |
HIP 104713 |
21.20 |
| 2026-09-24 00:00 |
21:11:37.96 |
-15:35:40.1 |
HIP 104713 |
21.58 |
| 2026-09-24 12:00 |
21:11:34.88 |
-15:35:52.2 |
HIP 104505 |
21.84 |
| 2026-09-25 00:00 |
21:11:31.83 |
-15:36:04.3 |
HIP 104505 |
21.08 |
| 2026-09-25 12:00 |
21:11:28.80 |
-15:36:16.2 |
HIP 104505 |
20.32 |
| 2026-09-26 00:00 |
21:11:25.81 |
-15:36:28.0 |
HIP 104505 |
19.58 |
| 2026-09-26 12:00 |
21:11:22.84 |
-15:36:39.7 |
HIP 104505 |
18.84 |
| 2026-09-27 00:00 |
21:11:19.89 |
-15:36:51.3 |
HIP 104505 |
18.10 |
| 2026-09-27 12:00 |
21:11:16.98 |
-15:37:02.7 |
HIP 104505 |
17.38 |
| 2026-09-28 00:00 |
21:11:14.10 |
-15:37:14.0 |
HIP 104505 |
16.66 |
| 2026-09-28 12:00 |
21:11:11.24 |
-15:37:25.2 |
HIP 104505 |
15.95 |
| 2026-09-29 00:00 |
21:11:08.41 |
-15:37:36.3 |
HIP 104505 |
15.24 |
| 2026-09-29 12:00 |
21:11:05.62 |
-15:37:47.2 |
HIP 104505 |
14.54 |
| 2026-09-30 00:00 |
21:11:02.85 |
-15:37:58.0 |
HIP 104505 |
13.85 |
| 2026-09-30 12:00 |
21:11:00.11 |
-15:38:08.7 |
HIP 104505 |
13.17 |
| 2026-10-01 00:00 |
21:10:57.40 |
-15:38:19.2 |
HIP 104505 |
12.50 |
| 2026-10-01 12:00 |
21:10:54.72 |
-15:38:29.6 |
HIP 104505 |
11.83 |
| 2026-10-02 00:00 |
21:10:52.07 |
-15:38:39.9 |
HIP 104505 |
11.17 |
| 2026-10-02 12:00 |
21:10:49.45 |
-15:38:50.1 |
HIP 104505 |
10.52 |
| 2026-10-03 00:00 |
21:10:46.86 |
-15:39:00.1 |
HIP 104505 |
9.88 |
| 2026-10-03 12:00 |
21:10:44.31 |
-15:39:10.0 |
HIP 104505 |
9.24 |
| 2026-10-04 00:00 |
21:10:41.78 |
-15:39:19.7 |
HIP 104505 |
8.61 |
| 2026-10-04 12:00 |
21:10:39.28 |
-15:39:29.3 |
HIP 104505 |
7.99 |
| 2026-10-05 00:00 |
21:10:36.82 |
-15:39:38.8 |
HIP 104505 |
7.38 |
| 2026-10-05 12:00 |
21:10:34.39 |
-15:39:48.1 |
HIP 104505 |
6.78 |
| 2026-10-06 00:00 |
21:10:31.98 |
-15:39:57.3 |
HIP 104505 |
6.18 |
| 2026-10-06 12:00 |
21:10:29.61 |
-15:40:06.4 |
HIP 104505 |
5.60 |
| 2026-10-07 00:00 |
21:10:27.28 |
-15:40:15.3 |
HIP 104505 |
5.02 |
| 2026-10-07 12:00 |
21:10:24.97 |
-15:40:24.1 |
HIP 104505 |
4.45 |
| 2026-10-08 00:00 |
21:10:22.70 |
-15:40:32.7 |
HIP 104505 |
3.90 |
| 2026-10-08 12:00 |
21:10:20.46 |
-15:40:41.2 |
HIP 104505 |
3.35 |
| 2026-10-09 00:00 |
21:10:18.25 |
-15:40:49.6 |
HIP 104505 |
2.82 |
| 2026-10-09 12:00 |
21:10:16.07 |
-15:40:57.8 |
HIP 104505 |
2.30 |
| 2026-10-10 00:00 |
21:10:13.93 |
-15:41:05.9 |
HIP 104505 |
1.80 |
| 2026-10-10 12:00 |
21:10:11.82 |
-15:41:13.8 |
HIP 104505 |
1.33 |
| 2026-10-11 00:00 |
21:10:09.75 |
-15:41:21.6 |
HIP 104505 |
0.94 |