| Parameter |
Value |
| Designation |
C/1998 K1 (Mueller) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1998-09-01T00:55:41.113920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:53Z |
| Obs used |
171 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1998-06-05.0000000 |
| e |
0.94515162 |
| q (au) |
3.416610 |
| a (au) |
62.291906 |
| i (deg) |
35.636035 |
| Ω (om, deg) |
18.256263 |
| ω (w, deg) |
165.250246 |
| M (ma, deg) |
359.823506 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.128 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.128 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.501 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
23:40:39.18 |
-26:35:01.1 |
HIP 116801 |
18.77 |
| 2026-06-01 12:00 |
23:40:39.97 |
-26:35:11.5 |
HIP 116801 |
18.65 |
| 2026-06-02 00:00 |
23:40:40.74 |
-26:35:22.1 |
HIP 116801 |
18.52 |
| 2026-06-02 12:00 |
23:40:41.48 |
-26:35:32.8 |
HIP 116801 |
18.39 |
| 2026-06-03 00:00 |
23:40:42.21 |
-26:35:43.7 |
HIP 116801 |
18.26 |
| 2026-06-03 12:00 |
23:40:42.91 |
-26:35:54.7 |
HIP 116801 |
18.13 |
| 2026-06-04 00:00 |
23:40:43.59 |
-26:36:05.9 |
HIP 116801 |
17.99 |
| 2026-06-04 12:00 |
23:40:44.25 |
-26:36:17.2 |
HIP 116801 |
17.86 |
| 2026-06-05 00:00 |
23:40:44.88 |
-26:36:28.7 |
HIP 116801 |
17.72 |
| 2026-06-05 12:00 |
23:40:45.49 |
-26:36:40.3 |
HIP 116801 |
17.58 |
| 2026-06-06 00:00 |
23:40:46.08 |
-26:36:52.1 |
HIP 116801 |
17.44 |
| 2026-06-06 12:00 |
23:40:46.65 |
-26:37:04.0 |
HIP 116801 |
17.30 |
| 2026-06-07 00:00 |
23:40:47.20 |
-26:37:16.1 |
HIP 116801 |
17.15 |
| 2026-06-07 12:00 |
23:40:47.72 |
-26:37:28.3 |
HIP 116801 |
17.01 |
| 2026-06-08 00:00 |
23:40:48.22 |
-26:37:40.7 |
HIP 116801 |
16.86 |
| 2026-06-08 12:00 |
23:40:48.70 |
-26:37:53.2 |
HIP 116801 |
16.71 |
| 2026-06-09 00:00 |
23:40:49.15 |
-26:38:05.8 |
HIP 116801 |
16.55 |
| 2026-06-09 12:00 |
23:40:49.58 |
-26:38:18.6 |
HIP 116801 |
16.40 |
| 2026-06-10 00:00 |
23:40:49.99 |
-26:38:31.6 |
HIP 116801 |
16.24 |
| 2026-06-10 12:00 |
23:40:50.38 |
-26:38:44.6 |
HIP 116801 |
16.08 |
| 2026-06-11 00:00 |
23:40:50.74 |
-26:38:57.8 |
HIP 116801 |
15.91 |
| 2026-06-11 12:00 |
23:40:51.08 |
-26:39:11.2 |
HIP 116801 |
15.75 |
| 2026-06-12 00:00 |
23:40:51.40 |
-26:39:24.7 |
HIP 116801 |
15.58 |
| 2026-06-12 12:00 |
23:40:51.69 |
-26:39:38.3 |
HIP 116801 |
15.41 |
| 2026-06-13 00:00 |
23:40:51.96 |
-26:39:52.1 |
HIP 116801 |
15.23 |
| 2026-06-13 12:00 |
23:40:52.21 |
-26:40:06.0 |
HIP 116801 |
15.06 |
| 2026-06-14 00:00 |
23:40:52.43 |
-26:40:20.0 |
HIP 116801 |
14.88 |
| 2026-06-14 12:00 |
23:40:52.63 |
-26:40:34.2 |
HIP 116801 |
14.69 |
| 2026-06-15 00:00 |
23:40:52.81 |
-26:40:48.4 |
HIP 116801 |
14.51 |
| 2026-06-15 12:00 |
23:40:52.97 |
-26:41:02.9 |
HIP 116801 |
14.32 |
| 2026-06-16 00:00 |
23:40:53.10 |
-26:41:17.4 |
HIP 116801 |
14.13 |
| 2026-06-16 12:00 |
23:40:53.21 |
-26:41:32.1 |
HIP 116801 |
13.94 |
| 2026-06-17 00:00 |
23:40:53.29 |
-26:41:46.9 |
HIP 116801 |
13.74 |
| 2026-06-17 12:00 |
23:40:53.35 |
-26:42:01.8 |
HIP 116801 |
13.54 |
| 2026-06-18 00:00 |
23:40:53.39 |
-26:42:16.9 |
HIP 116801 |
13.34 |
| 2026-06-18 12:00 |
23:40:53.41 |
-26:42:32.1 |
HIP 116801 |
13.13 |
| 2026-06-19 00:00 |
23:40:53.40 |
-26:42:47.3 |
HIP 116801 |
12.92 |
| 2026-06-19 12:00 |
23:40:53.37 |
-26:43:02.8 |
HIP 116801 |
12.71 |
| 2026-06-20 00:00 |
23:40:53.31 |
-26:43:18.3 |
HIP 116801 |
12.50 |
| 2026-06-20 12:00 |
23:40:53.24 |
-26:43:33.9 |
HIP 116801 |
12.28 |
| 2026-06-21 00:00 |
23:40:53.14 |
-26:43:49.7 |
HIP 116801 |
12.06 |
| 2026-06-21 12:00 |
23:40:53.01 |
-26:44:05.6 |
HIP 116801 |
11.83 |
| 2026-06-22 00:00 |
23:40:52.87 |
-26:44:21.6 |
HIP 116801 |
11.61 |