| Parameter |
Value |
| Designation |
C/1990 K1 (Levy) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1990-10-24T16:24:53.331840Z |
| Orbit solution date (soln_date, UTC) |
2023-08-19T20:42:31Z |
| Obs used |
666 |
| NEO |
- |
| M1 |
4.600 |
| K1 |
9.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1990-10-29.0000000 |
| e |
1.00058309 |
| q (au) |
0.938738 |
| a (au) |
-1609.945375 |
| i (deg) |
131.583977 |
| Ω (om, deg) |
139.364097 |
| ω (w, deg) |
242.666331 |
| M (ma, deg) |
0.000066 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.561 + 3.402\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.561 |
| n |
3.402 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.916 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 1990-05-20 |
1990-07-17 |
+0.5628 |
-0.382 |
| 1990-07-17 |
1990-10-23 |
-2.7920 |
+0.454 |
| 1990-10-24 |
1991-04-15 |
+1.4645 |
+0.190 |
| 1991-04-15 |
1991-11-07 |
-5.2198 |
+3.605 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
07:24:48.06 |
+56:05:01.6 |
HIP 36026 |
28.13 |
| 2026-09-20 12:00 |
07:24:49.27 |
+56:05:15.9 |
HIP 36026 |
27.86 |
| 2026-09-21 00:00 |
07:24:50.45 |
+56:05:30.4 |
HIP 36026 |
27.59 |
| 2026-09-21 12:00 |
07:24:51.61 |
+56:05:44.9 |
HIP 36026 |
27.33 |
| 2026-09-22 00:00 |
07:24:52.74 |
+56:05:59.5 |
HIP 36026 |
27.06 |
| 2026-09-22 12:00 |
07:24:53.84 |
+56:06:14.1 |
HIP 36026 |
26.79 |
| 2026-09-23 00:00 |
07:24:54.91 |
+56:06:28.9 |
HIP 36026 |
26.53 |
| 2026-09-23 12:00 |
07:24:55.96 |
+56:06:43.7 |
HIP 36026 |
26.26 |
| 2026-09-24 00:00 |
07:24:56.98 |
+56:06:58.6 |
HIP 36026 |
25.99 |
| 2026-09-24 12:00 |
07:24:57.97 |
+56:07:13.6 |
HIP 36026 |
25.72 |
| 2026-09-25 00:00 |
07:24:58.94 |
+56:07:28.6 |
HIP 36026 |
25.46 |
| 2026-09-25 12:00 |
07:24:59.87 |
+56:07:43.7 |
HIP 36026 |
25.19 |
| 2026-09-26 00:00 |
07:25:00.78 |
+56:07:58.9 |
HIP 36026 |
24.92 |
| 2026-09-26 12:00 |
07:25:01.66 |
+56:08:14.2 |
HIP 36026 |
24.65 |
| 2026-09-27 00:00 |
07:25:02.52 |
+56:08:29.5 |
HIP 36026 |
24.38 |
| 2026-09-27 12:00 |
07:25:03.34 |
+56:08:44.9 |
HIP 36026 |
24.11 |
| 2026-09-28 00:00 |
07:25:04.14 |
+56:09:00.4 |
HIP 36026 |
23.84 |
| 2026-09-28 12:00 |
07:25:04.91 |
+56:09:15.9 |
HIP 36026 |
23.57 |
| 2026-09-29 00:00 |
07:25:05.65 |
+56:09:31.5 |
HIP 36026 |
23.30 |
| 2026-09-29 12:00 |
07:25:06.36 |
+56:09:47.2 |
HIP 36026 |
23.03 |
| 2026-09-30 00:00 |
07:25:07.05 |
+56:10:02.9 |
HIP 36026 |
22.76 |
| 2026-09-30 12:00 |
07:25:07.71 |
+56:10:18.7 |
HIP 36026 |
22.48 |
| 2026-10-01 00:00 |
07:25:08.33 |
+56:10:34.6 |
HIP 36026 |
22.21 |
| 2026-10-01 12:00 |
07:25:08.93 |
+56:10:50.5 |
HIP 36026 |
21.94 |
| 2026-10-02 00:00 |
07:25:09.50 |
+56:11:06.5 |
HIP 36026 |
21.67 |
| 2026-10-02 12:00 |
07:25:10.04 |
+56:11:22.6 |
HIP 36026 |
21.39 |
| 2026-10-03 00:00 |
07:25:10.56 |
+56:11:38.7 |
HIP 36026 |
21.12 |
| 2026-10-03 12:00 |
07:25:11.04 |
+56:11:54.8 |
HIP 36026 |
20.84 |
| 2026-10-04 00:00 |
07:25:11.50 |
+56:12:11.1 |
HIP 36026 |
20.57 |
| 2026-10-04 12:00 |
07:25:11.92 |
+56:12:27.3 |
HIP 36026 |
20.29 |
| 2026-10-05 00:00 |
07:25:12.32 |
+56:12:43.7 |
HIP 36026 |
20.01 |
| 2026-10-05 12:00 |
07:25:12.68 |
+56:13:00.1 |
HIP 36026 |
19.74 |
| 2026-10-06 00:00 |
07:25:13.02 |
+56:13:16.5 |
HIP 36026 |
19.46 |
| 2026-10-06 12:00 |
07:25:13.33 |
+56:13:33.0 |
HIP 36026 |
19.18 |
| 2026-10-07 00:00 |
07:25:13.61 |
+56:13:49.5 |
HIP 36026 |
18.91 |
| 2026-10-07 12:00 |
07:25:13.86 |
+56:14:06.1 |
HIP 36026 |
18.63 |
| 2026-10-08 00:00 |
07:25:14.07 |
+56:14:22.8 |
HIP 36026 |
18.35 |
| 2026-10-08 12:00 |
07:25:14.26 |
+56:14:39.4 |
HIP 36026 |
18.07 |
| 2026-10-09 00:00 |
07:25:14.42 |
+56:14:56.2 |
HIP 36026 |
17.79 |
| 2026-10-09 12:00 |
07:25:14.55 |
+56:15:12.9 |
HIP 36026 |
17.51 |
| 2026-10-10 00:00 |
07:25:14.65 |
+56:15:29.8 |
HIP 36026 |
17.23 |
| 2026-10-10 12:00 |
07:25:14.72 |
+56:15:46.6 |
HIP 36026 |
16.95 |
| 2026-10-11 00:00 |
07:25:14.76 |
+56:16:03.5 |
HIP 36026 |
16.67 |