| 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) |
| 2026-06-01 00:00 |
03:57:25.29 |
+46:26:30.0 |
HIP 18423 |
13.68 |
| 2026-06-01 12:00 |
03:57:31.85 |
+46:26:48.6 |
HIP 18423 |
14.45 |
| 2026-06-02 00:00 |
03:57:38.39 |
+46:27:07.4 |
HIP 18423 |
15.27 |
| 2026-06-02 12:00 |
03:57:44.93 |
+46:27:26.4 |
HIP 18423 |
16.13 |
| 2026-06-03 00:00 |
03:57:51.46 |
+46:27:45.6 |
HIP 18423 |
17.03 |
| 2026-06-03 12:00 |
03:57:57.98 |
+46:28:05.0 |
HIP 18423 |
17.95 |
| 2026-06-04 00:00 |
03:58:04.50 |
+46:28:24.6 |
HIP 18423 |
18.90 |
| 2026-06-04 12:00 |
03:58:11.00 |
+46:28:44.4 |
HIP 18423 |
19.87 |
| 2026-06-05 00:00 |
03:58:17.49 |
+46:29:04.3 |
HIP 18423 |
20.86 |
| 2026-06-05 12:00 |
03:58:23.98 |
+46:29:24.5 |
HIP 18423 |
21.86 |
| 2026-06-06 00:00 |
03:58:30.45 |
+46:29:44.8 |
HIP 18423 |
22.87 |
| 2026-06-06 12:00 |
03:58:36.91 |
+46:30:05.3 |
HIP 18423 |
23.90 |
| 2026-06-07 00:00 |
03:58:43.36 |
+46:30:26.0 |
HIP 18698 |
24.69 |
| 2026-06-07 12:00 |
03:58:49.80 |
+46:30:46.9 |
HIP 18698 |
23.69 |
| 2026-06-08 00:00 |
03:58:56.23 |
+46:31:08.0 |
HIP 18698 |
22.71 |
| 2026-06-08 12:00 |
03:59:02.64 |
+46:31:29.2 |
HIP 18698 |
21.74 |
| 2026-06-09 00:00 |
03:59:09.05 |
+46:31:50.7 |
HIP 18698 |
20.78 |
| 2026-06-09 12:00 |
03:59:15.44 |
+46:32:12.3 |
HIP 18698 |
19.85 |
| 2026-06-10 00:00 |
03:59:21.81 |
+46:32:34.1 |
HIP 18698 |
18.94 |
| 2026-06-10 12:00 |
03:59:28.17 |
+46:32:56.1 |
HIP 18698 |
18.06 |
| 2026-06-11 00:00 |
03:59:34.52 |
+46:33:18.3 |
HIP 18698 |
17.21 |
| 2026-06-11 12:00 |
03:59:40.86 |
+46:33:40.6 |
HIP 18698 |
16.39 |
| 2026-06-12 00:00 |
03:59:47.17 |
+46:34:03.1 |
HIP 18698 |
15.62 |
| 2026-06-12 12:00 |
03:59:53.48 |
+46:34:25.8 |
HIP 18698 |
14.89 |
| 2026-06-13 00:00 |
03:59:59.76 |
+46:34:48.6 |
HIP 18698 |
14.21 |
| 2026-06-13 12:00 |
04:00:06.04 |
+46:35:11.7 |
HIP 18698 |
13.59 |
| 2026-06-14 00:00 |
04:00:12.29 |
+46:35:34.9 |
HIP 18698 |
13.05 |
| 2026-06-14 12:00 |
04:00:18.53 |
+46:35:58.3 |
HIP 18698 |
12.57 |
| 2026-06-15 00:00 |
04:00:24.75 |
+46:36:21.8 |
HIP 18698 |
12.19 |
| 2026-06-15 12:00 |
04:00:30.95 |
+46:36:45.5 |
HIP 18698 |
11.90 |
| 2026-06-16 00:00 |
04:00:37.14 |
+46:37:09.4 |
HIP 18698 |
11.70 |
| 2026-06-16 12:00 |
04:00:43.31 |
+46:37:33.4 |
HIP 18698 |
11.61 |
| 2026-06-17 00:00 |
04:00:49.46 |
+46:37:57.7 |
HIP 18698 |
11.63 |
| 2026-06-17 12:00 |
04:00:55.58 |
+46:38:22.0 |
HIP 18698 |
11.75 |
| 2026-06-18 00:00 |
04:01:01.69 |
+46:38:46.6 |
HIP 18698 |
11.97 |
| 2026-06-18 12:00 |
04:01:07.78 |
+46:39:11.2 |
HIP 18698 |
12.29 |
| 2026-06-19 00:00 |
04:01:13.85 |
+46:39:36.1 |
HIP 18698 |
12.69 |
| 2026-06-19 12:00 |
04:01:19.90 |
+46:40:01.1 |
HIP 18698 |
13.18 |
| 2026-06-20 00:00 |
04:01:25.93 |
+46:40:26.3 |
HIP 18698 |
13.73 |
| 2026-06-20 12:00 |
04:01:31.94 |
+46:40:51.6 |
HIP 18698 |
14.34 |
| 2026-06-21 00:00 |
04:01:37.92 |
+46:41:17.0 |
HIP 18698 |
15.01 |
| 2026-06-21 12:00 |
04:01:43.88 |
+46:41:42.7 |
HIP 18698 |
15.72 |
| 2026-06-22 00:00 |
04:01:49.82 |
+46:42:08.4 |
HIP 18698 |
16.47 |