| Parameter |
Value |
| Designation |
C/1989 Q1 (Okazaki-Levy-Rudenko) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1989-11-11T21:59:23.887680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:38Z |
| Obs used |
225 |
| NEO |
- |
| M1 |
8.600 |
| K1 |
11.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1989-10-08.0000000 |
| e |
1.00005568 |
| q (au) |
0.642331 |
| a (au) |
-11536.096034 |
| i (deg) |
90.145942 |
| Ω (om, deg) |
275.510071 |
| ω (w, deg) |
150.571089 |
| M (ma, deg) |
-0.000028 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.901 + 2.905\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.901 |
| n |
2.905 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.286 |
| 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 |
| 1989-08-24 |
1989-09-13 |
+19.0917 |
-2.707 |
| 1989-09-13 |
1989-11-11 |
-0.2123 |
-0.358 |
| 1989-11-12 |
1990-01-05 |
+1.0681 |
+0.558 |
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 |
18:44:14.84 |
-64:59:30.3 |
HIP 92024 |
10.53 |
| 2026-06-01 12:00 |
18:44:10.90 |
-64:59:40.9 |
HIP 92024 |
10.95 |
| 2026-06-02 00:00 |
18:44:06.94 |
-64:59:51.3 |
HIP 92024 |
11.38 |
| 2026-06-02 12:00 |
18:44:02.96 |
-65:00:01.6 |
HIP 92024 |
11.81 |
| 2026-06-03 00:00 |
18:43:58.96 |
-65:00:11.7 |
HIP 92024 |
12.24 |
| 2026-06-03 12:00 |
18:43:54.94 |
-65:00:21.7 |
HIP 92024 |
12.67 |
| 2026-06-04 00:00 |
18:43:50.91 |
-65:00:31.6 |
HIP 92024 |
13.10 |
| 2026-06-04 12:00 |
18:43:46.85 |
-65:00:41.3 |
HIP 92024 |
13.54 |
| 2026-06-05 00:00 |
18:43:42.78 |
-65:00:50.8 |
HIP 92024 |
13.97 |
| 2026-06-05 12:00 |
18:43:38.69 |
-65:01:00.2 |
HIP 92024 |
14.41 |
| 2026-06-06 00:00 |
18:43:34.58 |
-65:01:09.5 |
HIP 92024 |
14.85 |
| 2026-06-06 12:00 |
18:43:30.45 |
-65:01:18.6 |
HIP 92024 |
15.29 |
| 2026-06-07 00:00 |
18:43:26.31 |
-65:01:27.5 |
HIP 92024 |
15.73 |
| 2026-06-07 12:00 |
18:43:22.15 |
-65:01:36.3 |
HIP 92024 |
16.18 |
| 2026-06-08 00:00 |
18:43:17.97 |
-65:01:45.0 |
HIP 92024 |
16.62 |
| 2026-06-08 12:00 |
18:43:13.78 |
-65:01:53.5 |
HIP 92024 |
17.07 |
| 2026-06-09 00:00 |
18:43:09.57 |
-65:02:01.9 |
HIP 92024 |
17.51 |
| 2026-06-09 12:00 |
18:43:05.34 |
-65:02:10.1 |
HIP 92024 |
17.96 |
| 2026-06-10 00:00 |
18:43:01.11 |
-65:02:18.1 |
HIP 92024 |
18.41 |
| 2026-06-10 12:00 |
18:42:56.85 |
-65:02:26.0 |
HIP 92024 |
18.86 |
| 2026-06-11 00:00 |
18:42:52.58 |
-65:02:33.7 |
HIP 92024 |
19.31 |
| 2026-06-11 12:00 |
18:42:48.30 |
-65:02:41.3 |
HIP 92024 |
19.76 |
| 2026-06-12 00:00 |
18:42:44.00 |
-65:02:48.7 |
HIP 92024 |
20.21 |
| 2026-06-12 12:00 |
18:42:39.69 |
-65:02:56.0 |
HIP 92024 |
20.66 |
| 2026-06-13 00:00 |
18:42:35.37 |
-65:03:03.1 |
HIP 92024 |
21.11 |
| 2026-06-13 12:00 |
18:42:31.03 |
-65:03:10.1 |
HIP 92024 |
21.57 |
| 2026-06-14 00:00 |
18:42:26.69 |
-65:03:16.8 |
HIP 92024 |
22.02 |
| 2026-06-14 12:00 |
18:42:22.32 |
-65:03:23.5 |
HIP 92024 |
22.48 |
| 2026-06-15 00:00 |
18:42:17.95 |
-65:03:29.9 |
HIP 92024 |
22.93 |
| 2026-06-15 12:00 |
18:42:13.57 |
-65:03:36.2 |
HIP 91456 |
22.61 |
| 2026-06-16 00:00 |
18:42:09.17 |
-65:03:42.4 |
HIP 91456 |
22.27 |
| 2026-06-16 12:00 |
18:42:04.77 |
-65:03:48.3 |
HIP 91456 |
21.93 |
| 2026-06-17 00:00 |
18:42:00.35 |
-65:03:54.2 |
HIP 91456 |
21.60 |
| 2026-06-17 12:00 |
18:41:55.93 |
-65:03:59.8 |
HIP 91456 |
21.27 |
| 2026-06-18 00:00 |
18:41:51.49 |
-65:04:05.3 |
HIP 91456 |
20.94 |
| 2026-06-18 12:00 |
18:41:47.05 |
-65:04:10.6 |
HIP 91456 |
20.61 |
| 2026-06-19 00:00 |
18:41:42.60 |
-65:04:15.7 |
HIP 91456 |
20.29 |
| 2026-06-19 12:00 |
18:41:38.14 |
-65:04:20.7 |
HIP 91456 |
19.97 |
| 2026-06-20 00:00 |
18:41:33.67 |
-65:04:25.5 |
HIP 91456 |
19.66 |
| 2026-06-20 12:00 |
18:41:29.19 |
-65:04:30.2 |
HIP 91456 |
19.35 |
| 2026-06-21 00:00 |
18:41:24.71 |
-65:04:34.7 |
HIP 91456 |
19.04 |
| 2026-06-21 12:00 |
18:41:20.21 |
-65:04:39.0 |
HIP 91456 |
18.74 |
| 2026-06-22 00:00 |
18:41:15.72 |
-65:04:43.2 |
HIP 91456 |
18.45 |