| Parameter |
Value |
| Designation |
C/2015 K1 (MASTER) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-10-13T13:49:54.566400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:10Z |
| Obs used |
584 |
| NEO |
- |
| M1 |
11.100 |
| K1 |
5.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-08-30.0000000 |
| e |
0.98583674 |
| q (au) |
2.557494 |
| a (au) |
180.572455 |
| i (deg) |
29.381729 |
| Ω (om, deg) |
5.177060 |
| ω (w, deg) |
280.196200 |
| M (ma, deg) |
0.130152 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.364 + 3.427\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.364 |
| n |
3.427 |
| gf |
0.946 |
| gb |
-0.917 |
| k |
0.999 |
| δ90 |
1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
04:09:01.04 |
+48:14:56.7 |
HIP 19343 |
32.39 |
| 2026-09-20 12:00 |
04:08:58.86 |
+48:15:22.6 |
HIP 19343 |
32.78 |
| 2026-09-21 00:00 |
04:08:56.62 |
+48:15:48.3 |
HIP 19343 |
33.17 |
| 2026-09-21 12:00 |
04:08:54.33 |
+48:16:13.9 |
HIP 19286 |
32.93 |
| 2026-09-22 00:00 |
04:08:51.99 |
+48:16:39.2 |
HIP 19286 |
32.42 |
| 2026-09-22 12:00 |
04:08:49.59 |
+48:17:04.4 |
HIP 19286 |
31.92 |
| 2026-09-23 00:00 |
04:08:47.14 |
+48:17:29.4 |
HIP 19286 |
31.42 |
| 2026-09-23 12:00 |
04:08:44.64 |
+48:17:54.1 |
HIP 19286 |
30.92 |
| 2026-09-24 00:00 |
04:08:42.08 |
+48:18:18.7 |
HIP 19286 |
30.42 |
| 2026-09-24 12:00 |
04:08:39.48 |
+48:18:43.1 |
HIP 19286 |
29.93 |
| 2026-09-25 00:00 |
04:08:36.82 |
+48:19:07.3 |
HIP 19286 |
29.45 |
| 2026-09-25 12:00 |
04:08:34.11 |
+48:19:31.3 |
HIP 19286 |
28.97 |
| 2026-09-26 00:00 |
04:08:31.34 |
+48:19:55.0 |
HIP 19286 |
28.50 |
| 2026-09-26 12:00 |
04:08:28.53 |
+48:20:18.6 |
HIP 19286 |
28.03 |
| 2026-09-27 00:00 |
04:08:25.66 |
+48:20:42.0 |
HIP 19286 |
27.58 |
| 2026-09-27 12:00 |
04:08:22.75 |
+48:21:05.1 |
HIP 19286 |
27.13 |
| 2026-09-28 00:00 |
04:08:19.78 |
+48:21:28.1 |
HIP 19286 |
26.69 |
| 2026-09-28 12:00 |
04:08:16.76 |
+48:21:50.8 |
HIP 19286 |
26.26 |
| 2026-09-29 00:00 |
04:08:13.69 |
+48:22:13.3 |
HIP 19286 |
25.84 |
| 2026-09-29 12:00 |
04:08:10.57 |
+48:22:35.6 |
HIP 19286 |
25.43 |
| 2026-09-30 00:00 |
04:08:07.40 |
+48:22:57.7 |
HIP 19286 |
25.04 |
| 2026-09-30 12:00 |
04:08:04.18 |
+48:23:19.6 |
HIP 19286 |
24.66 |
| 2026-10-01 00:00 |
04:08:00.91 |
+48:23:41.2 |
HIP 19286 |
24.30 |
| 2026-10-01 12:00 |
04:07:57.59 |
+48:24:02.6 |
HIP 19286 |
23.95 |
| 2026-10-02 00:00 |
04:07:54.22 |
+48:24:23.8 |
HIP 19286 |
23.62 |
| 2026-10-02 12:00 |
04:07:50.80 |
+48:24:44.7 |
HIP 19286 |
23.31 |
| 2026-10-03 00:00 |
04:07:47.33 |
+48:25:05.5 |
HIP 19286 |
23.01 |
| 2026-10-03 12:00 |
04:07:43.82 |
+48:25:26.0 |
HIP 19286 |
22.74 |
| 2026-10-04 00:00 |
04:07:40.25 |
+48:25:46.2 |
HIP 19286 |
22.49 |
| 2026-10-04 12:00 |
04:07:36.64 |
+48:26:06.2 |
HIP 19286 |
22.26 |
| 2026-10-05 00:00 |
04:07:32.97 |
+48:26:26.0 |
HIP 19286 |
22.06 |
| 2026-10-05 12:00 |
04:07:29.26 |
+48:26:45.5 |
HIP 19286 |
21.88 |
| 2026-10-06 00:00 |
04:07:25.51 |
+48:27:04.8 |
HIP 19286 |
21.73 |
| 2026-10-06 12:00 |
04:07:21.70 |
+48:27:23.9 |
HIP 19286 |
21.61 |
| 2026-10-07 00:00 |
04:07:17.85 |
+48:27:42.7 |
HIP 19286 |
21.52 |
| 2026-10-07 12:00 |
04:07:13.95 |
+48:28:01.2 |
HIP 19286 |
21.46 |
| 2026-10-08 00:00 |
04:07:10.00 |
+48:28:19.5 |
HIP 19286 |
21.42 |
| 2026-10-08 12:00 |
04:07:06.01 |
+48:28:37.6 |
HIP 19286 |
21.42 |
| 2026-10-09 00:00 |
04:07:01.97 |
+48:28:55.4 |
HIP 19286 |
21.45 |
| 2026-10-09 12:00 |
04:06:57.89 |
+48:29:12.9 |
HIP 19286 |
21.51 |
| 2026-10-10 00:00 |
04:06:53.76 |
+48:29:30.2 |
HIP 19092 |
21.56 |
| 2026-10-10 12:00 |
04:06:49.59 |
+48:29:47.2 |
HIP 19092 |
21.39 |
| 2026-10-11 00:00 |
04:06:45.37 |
+48:30:03.9 |
HIP 19092 |
21.23 |