| Parameter |
Value |
| Designation |
C/1999 K1 (SOHO) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-05-21T08:52:48Z |
| Orbit solution date (soln_date, UTC) |
- |
| Obs used |
40 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1999-05-21.3700000 |
| e |
1.00000000 |
| q (au) |
0.005100 |
| a (au) |
- |
| i (deg) |
143.780000 |
| Ω (om, deg) |
5.490000 |
| ω (w, deg) |
83.510000 |
| M (ma, deg) |
- |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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 |
06:47:04.27 |
-12:26:55.7 |
HIP 32513 |
15.00 |
| 2026-06-01 12:00 |
06:47:06.24 |
-12:26:47.6 |
HIP 32513 |
14.85 |
| 2026-06-02 00:00 |
06:47:08.21 |
-12:26:39.7 |
HIP 32513 |
14.72 |
| 2026-06-02 12:00 |
06:47:10.19 |
-12:26:32.0 |
HIP 32513 |
14.61 |
| 2026-06-03 00:00 |
06:47:12.18 |
-12:26:24.4 |
HIP 32513 |
14.51 |
| 2026-06-03 12:00 |
06:47:14.18 |
-12:26:17.0 |
HIP 32513 |
14.44 |
| 2026-06-04 00:00 |
06:47:16.19 |
-12:26:09.7 |
HIP 32513 |
14.39 |
| 2026-06-04 12:00 |
06:47:18.20 |
-12:26:02.6 |
HIP 32513 |
14.36 |
| 2026-06-05 00:00 |
06:47:20.23 |
-12:25:55.6 |
HIP 32513 |
14.35 |
| 2026-06-05 12:00 |
06:47:22.26 |
-12:25:48.8 |
HIP 32513 |
14.36 |
| 2026-06-06 00:00 |
06:47:24.31 |
-12:25:42.1 |
HIP 32513 |
14.39 |
| 2026-06-06 12:00 |
06:47:26.36 |
-12:25:35.6 |
HIP 32513 |
14.44 |
| 2026-06-07 00:00 |
06:47:28.41 |
-12:25:29.3 |
HIP 32513 |
14.51 |
| 2026-06-07 12:00 |
06:47:30.48 |
-12:25:23.1 |
HIP 32513 |
14.61 |
| 2026-06-08 00:00 |
06:47:32.55 |
-12:25:17.1 |
HIP 32513 |
14.72 |
| 2026-06-08 12:00 |
06:47:34.63 |
-12:25:11.2 |
HIP 32513 |
14.86 |
| 2026-06-09 00:00 |
06:47:36.72 |
-12:25:05.5 |
HIP 32513 |
15.01 |
| 2026-06-09 12:00 |
06:47:38.82 |
-12:25:00.0 |
HIP 32513 |
15.19 |
| 2026-06-10 00:00 |
06:47:40.92 |
-12:24:54.6 |
HIP 32513 |
15.38 |
| 2026-06-10 12:00 |
06:47:43.03 |
-12:24:49.3 |
HIP 32513 |
15.59 |
| 2026-06-11 00:00 |
06:47:45.15 |
-12:24:44.3 |
HIP 32513 |
15.82 |
| 2026-06-11 12:00 |
06:47:47.27 |
-12:24:39.3 |
HIP 32513 |
16.07 |
| 2026-06-12 00:00 |
06:47:49.40 |
-12:24:34.6 |
HIP 32513 |
16.33 |
| 2026-06-12 12:00 |
06:47:51.54 |
-12:24:30.0 |
HIP 32513 |
16.61 |
| 2026-06-13 00:00 |
06:47:53.68 |
-12:24:25.6 |
HIP 32513 |
16.90 |
| 2026-06-13 12:00 |
06:47:55.83 |
-12:24:21.3 |
HIP 32513 |
17.20 |
| 2026-06-14 00:00 |
06:47:57.98 |
-12:24:17.2 |
HIP 32513 |
17.52 |
| 2026-06-14 12:00 |
06:48:00.14 |
-12:24:13.3 |
HIP 32513 |
17.86 |
| 2026-06-15 00:00 |
06:48:02.31 |
-12:24:09.5 |
HIP 32513 |
18.20 |
| 2026-06-15 12:00 |
06:48:04.48 |
-12:24:05.9 |
HIP 32513 |
18.56 |
| 2026-06-16 00:00 |
06:48:06.66 |
-12:24:02.4 |
HIP 32513 |
18.93 |
| 2026-06-16 12:00 |
06:48:08.84 |
-12:23:59.1 |
HIP 32513 |
19.31 |
| 2026-06-17 00:00 |
06:48:11.03 |
-12:23:56.0 |
HIP 32513 |
19.70 |
| 2026-06-17 12:00 |
06:48:13.22 |
-12:23:53.0 |
HIP 32513 |
20.10 |
| 2026-06-18 00:00 |
06:48:15.41 |
-12:23:50.2 |
HIP 32513 |
20.50 |
| 2026-06-18 12:00 |
06:48:17.62 |
-12:23:47.6 |
HIP 32513 |
20.92 |
| 2026-06-19 00:00 |
06:48:19.82 |
-12:23:45.1 |
HIP 32696 |
21.30 |
| 2026-06-19 12:00 |
06:48:22.03 |
-12:23:42.8 |
HIP 32696 |
20.98 |
| 2026-06-20 00:00 |
06:48:24.24 |
-12:23:40.7 |
HIP 32696 |
20.68 |
| 2026-06-20 12:00 |
06:48:26.46 |
-12:23:38.7 |
HIP 32696 |
20.38 |
| 2026-06-21 00:00 |
06:48:28.68 |
-12:23:36.9 |
HIP 32696 |
20.09 |
| 2026-06-21 12:00 |
06:48:30.91 |
-12:23:35.2 |
HIP 32696 |
19.81 |
| 2026-06-22 00:00 |
06:48:33.13 |
-12:23:33.7 |
HIP 32696 |
19.53 |