C/1999 K7 (LINEAR)
| Parameter |
Value |
| Designation |
C/1999 K7 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1999-02-24T18:38:47.711040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:00Z |
| Obs used |
37 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1999-06-03.0000000 |
| e |
0.99652152 |
| q (au) |
2.322718 |
| a (au) |
667.740065 |
| i (deg) |
135.158550 |
| Ω (om, deg) |
50.330978 |
| ω (w, deg) |
104.660079 |
| M (ma, deg) |
0.005611 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.412 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.412 |
| n |
2.000 |
| gf |
0.999 |
| gb |
-0.500 |
| 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) |
| 2026-02-03 00:00 |
09:17:57.93 |
-31:52:12.6 |
HIP 45759 |
26.53 |
| 2026-02-03 12:00 |
09:17:54.96 |
-31:52:06.0 |
HIP 45759 |
27.07 |
| 2026-02-04 00:00 |
09:17:51.98 |
-31:51:59.2 |
HIP 45759 |
27.61 |
| 2026-02-04 12:00 |
09:17:49.00 |
-31:51:52.1 |
HIP 45626 |
27.73 |
| 2026-02-05 00:00 |
09:17:46.02 |
-31:51:44.7 |
HIP 45626 |
27.67 |
| 2026-02-05 12:00 |
09:17:43.04 |
-31:51:37.1 |
HIP 45626 |
27.62 |
| 2026-02-06 00:00 |
09:17:40.06 |
-31:51:29.3 |
HIP 45626 |
27.59 |
| 2026-02-06 12:00 |
09:17:37.09 |
-31:51:21.2 |
HIP 45626 |
27.56 |
| 2026-02-07 00:00 |
09:17:34.11 |
-31:51:12.8 |
HIP 45626 |
27.55 |
| 2026-02-07 12:00 |
09:17:31.13 |
-31:51:04.2 |
HIP 45626 |
27.54 |
| 2026-02-08 00:00 |
09:17:28.15 |
-31:50:55.4 |
HIP 45626 |
27.55 |
| 2026-02-08 12:00 |
09:17:25.17 |
-31:50:46.3 |
HIP 45626 |
27.57 |
| 2026-02-09 00:00 |
09:17:22.20 |
-31:50:36.9 |
HIP 45626 |
27.60 |
| 2026-02-09 12:00 |
09:17:19.22 |
-31:50:27.4 |
HIP 45626 |
27.65 |
| 2026-02-10 00:00 |
09:17:16.25 |
-31:50:17.5 |
HIP 45626 |
27.70 |
| 2026-02-10 12:00 |
09:17:13.28 |
-31:50:07.4 |
HIP 45626 |
27.77 |
| 2026-02-11 00:00 |
09:17:10.31 |
-31:49:57.1 |
HIP 45626 |
27.84 |
| 2026-02-11 12:00 |
09:17:07.34 |
-31:49:46.6 |
HIP 45626 |
27.93 |
| 2026-02-12 00:00 |
09:17:04.38 |
-31:49:35.7 |
HIP 45626 |
28.03 |
| 2026-02-12 12:00 |
09:17:01.41 |
-31:49:24.7 |
HIP 45626 |
28.14 |
| 2026-02-13 00:00 |
09:16:58.45 |
-31:49:13.4 |
HIP 45626 |
28.26 |
| 2026-02-13 12:00 |
09:16:55.50 |
-31:49:01.9 |
HIP 45626 |
28.40 |
| 2026-02-14 00:00 |
09:16:52.55 |
-31:48:50.1 |
HIP 45626 |
28.54 |
| 2026-02-14 12:00 |
09:16:49.60 |
-31:48:38.1 |
HIP 45626 |
28.69 |
| 2026-02-15 00:00 |
09:16:46.65 |
-31:48:25.9 |
HIP 45626 |
28.86 |
| 2026-02-15 12:00 |
09:16:43.71 |
-31:48:13.4 |
HIP 45626 |
29.03 |
| 2026-02-16 00:00 |
09:16:40.78 |
-31:48:00.7 |
HIP 45626 |
29.22 |
| 2026-02-16 12:00 |
09:16:37.85 |
-31:47:47.7 |
HIP 45626 |
29.41 |
| 2026-02-17 00:00 |
09:16:34.92 |
-31:47:34.5 |
HIP 45626 |
29.62 |
| 2026-02-17 12:00 |
09:16:32.00 |
-31:47:21.1 |
HIP 45626 |
29.83 |
| 2026-02-18 00:00 |
09:16:29.09 |
-31:47:07.5 |
HIP 45626 |
30.05 |
| 2026-02-18 12:00 |
09:16:26.18 |
-31:46:53.6 |
HIP 45626 |
30.29 |
| 2026-02-19 00:00 |
09:16:23.27 |
-31:46:39.5 |
HIP 45626 |
30.53 |
| 2026-02-19 12:00 |
09:16:20.37 |
-31:46:25.2 |
HIP 45626 |
30.78 |
| 2026-02-20 00:00 |
09:16:17.48 |
-31:46:10.6 |
HIP 45626 |
31.04 |
| 2026-02-20 12:00 |
09:16:14.60 |
-31:45:55.8 |
HIP 45626 |
31.30 |
| 2026-02-21 00:00 |
09:16:11.72 |
-31:45:40.8 |
HIP 45626 |
31.58 |
| 2026-02-21 12:00 |
09:16:08.85 |
-31:45:25.6 |
HIP 45626 |
31.86 |
| 2026-02-22 00:00 |
09:16:05.99 |
-31:45:10.2 |
HIP 45626 |
32.15 |
| 2026-02-22 12:00 |
09:16:03.13 |
-31:44:54.5 |
HIP 45626 |
32.45 |
| 2026-02-23 00:00 |
09:16:00.28 |
-31:44:38.6 |
HIP 45626 |
32.76 |
| 2026-02-23 12:00 |
09:15:57.44 |
-31:44:22.5 |
HIP 45626 |
33.07 |
| 2026-02-24 00:00 |
09:15:54.61 |
-31:44:06.2 |
HIP 45626 |
33.39 |