| 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) |
| 2026-06-01 00:00 |
07:14:35.26 |
+55:59:41.2 |
HIP 34869 |
18.51 |
| 2026-06-01 12:00 |
07:14:37.91 |
+55:59:29.6 |
HIP 34869 |
18.67 |
| 2026-06-02 00:00 |
07:14:40.57 |
+55:59:18.2 |
HIP 34869 |
18.85 |
| 2026-06-02 12:00 |
07:14:43.25 |
+55:59:06.8 |
HIP 34869 |
19.04 |
| 2026-06-03 00:00 |
07:14:45.95 |
+55:58:55.5 |
HIP 34869 |
19.24 |
| 2026-06-03 12:00 |
07:14:48.66 |
+55:58:44.3 |
HIP 34869 |
19.45 |
| 2026-06-04 00:00 |
07:14:51.39 |
+55:58:33.3 |
HIP 34869 |
19.67 |
| 2026-06-04 12:00 |
07:14:54.13 |
+55:58:22.3 |
HIP 34869 |
19.90 |
| 2026-06-05 00:00 |
07:14:56.89 |
+55:58:11.4 |
HIP 34869 |
20.14 |
| 2026-06-05 12:00 |
07:14:59.67 |
+55:58:00.6 |
HIP 34869 |
20.38 |
| 2026-06-06 00:00 |
07:15:02.46 |
+55:57:49.9 |
HIP 34869 |
20.64 |
| 2026-06-06 12:00 |
07:15:05.26 |
+55:57:39.2 |
HIP 34869 |
20.90 |
| 2026-06-07 00:00 |
07:15:08.08 |
+55:57:28.7 |
HIP 34869 |
21.17 |
| 2026-06-07 12:00 |
07:15:10.91 |
+55:57:18.3 |
HIP 34869 |
21.45 |
| 2026-06-08 00:00 |
07:15:13.75 |
+55:57:08.0 |
HIP 34869 |
21.74 |
| 2026-06-08 12:00 |
07:15:16.61 |
+55:56:57.8 |
HIP 34869 |
22.03 |
| 2026-06-09 00:00 |
07:15:19.48 |
+55:56:47.7 |
HIP 34869 |
22.34 |
| 2026-06-09 12:00 |
07:15:22.37 |
+55:56:37.7 |
HIP 34869 |
22.64 |
| 2026-06-10 00:00 |
07:15:25.27 |
+55:56:27.7 |
HIP 34869 |
22.96 |
| 2026-06-10 12:00 |
07:15:28.18 |
+55:56:17.9 |
HIP 34869 |
23.28 |
| 2026-06-11 00:00 |
07:15:31.11 |
+55:56:08.2 |
HIP 34869 |
23.61 |
| 2026-06-11 12:00 |
07:15:34.05 |
+55:55:58.6 |
HIP 34869 |
23.94 |
| 2026-06-12 00:00 |
07:15:37.00 |
+55:55:49.1 |
HIP 34869 |
24.28 |
| 2026-06-12 12:00 |
07:15:39.96 |
+55:55:39.7 |
HIP 34869 |
24.62 |
| 2026-06-13 00:00 |
07:15:42.93 |
+55:55:30.4 |
HIP 34869 |
24.97 |
| 2026-06-13 12:00 |
07:15:45.92 |
+55:55:21.3 |
HIP 34869 |
25.33 |
| 2026-06-14 00:00 |
07:15:48.92 |
+55:55:12.2 |
HIP 34869 |
25.69 |
| 2026-06-14 12:00 |
07:15:51.93 |
+55:55:03.2 |
HIP 34869 |
26.05 |
| 2026-06-15 00:00 |
07:15:54.95 |
+55:54:54.4 |
HIP 34869 |
26.42 |
| 2026-06-15 12:00 |
07:15:57.98 |
+55:54:45.6 |
HIP 34869 |
26.80 |
| 2026-06-16 00:00 |
07:16:01.02 |
+55:54:37.0 |
HIP 34869 |
27.17 |
| 2026-06-16 12:00 |
07:16:04.08 |
+55:54:28.4 |
HIP 34869 |
27.56 |
| 2026-06-17 00:00 |
07:16:07.14 |
+55:54:20.0 |
HIP 34869 |
27.94 |
| 2026-06-17 12:00 |
07:16:10.21 |
+55:54:11.7 |
HIP 34869 |
28.33 |
| 2026-06-18 00:00 |
07:16:13.29 |
+55:54:03.5 |
HIP 34869 |
28.72 |
| 2026-06-18 12:00 |
07:16:16.38 |
+55:53:55.4 |
HIP 34869 |
29.12 |
| 2026-06-19 00:00 |
07:16:19.49 |
+55:53:47.5 |
HIP 34869 |
29.52 |
| 2026-06-19 12:00 |
07:16:22.60 |
+55:53:39.6 |
HIP 34869 |
29.93 |
| 2026-06-20 00:00 |
07:16:25.72 |
+55:53:31.9 |
HIP 34869 |
30.33 |
| 2026-06-20 12:00 |
07:16:28.84 |
+55:53:24.2 |
HIP 34869 |
30.74 |
| 2026-06-21 00:00 |
07:16:31.98 |
+55:53:16.7 |
HIP 34869 |
31.15 |
| 2026-06-21 12:00 |
07:16:35.12 |
+55:53:09.3 |
HIP 34869 |
31.57 |
| 2026-06-22 00:00 |
07:16:38.28 |
+55:53:02.0 |
HIP 34869 |
31.99 |