C/1989 Q1 (Okazaki-Levy-Rudenko)
| 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) |
| 2026-02-03 00:00 |
18:44:38.70 |
-63:58:08.6 |
HIP 92121 |
13.08 |
| 2026-02-03 12:00 |
18:44:42.39 |
-63:58:17.2 |
HIP 92121 |
12.65 |
| 2026-02-04 00:00 |
18:44:46.06 |
-63:58:25.9 |
HIP 92121 |
12.22 |
| 2026-02-04 12:00 |
18:44:49.70 |
-63:58:34.8 |
HIP 92121 |
11.79 |
| 2026-02-05 00:00 |
18:44:53.33 |
-63:58:43.9 |
HIP 92121 |
11.37 |
| 2026-02-05 12:00 |
18:44:56.93 |
-63:58:53.1 |
HIP 92121 |
10.94 |
| 2026-02-06 00:00 |
18:45:00.51 |
-63:59:02.4 |
HIP 92121 |
10.52 |
| 2026-02-06 12:00 |
18:45:04.07 |
-63:59:11.8 |
HIP 92121 |
10.10 |
| 2026-02-07 00:00 |
18:45:07.61 |
-63:59:21.4 |
HIP 92121 |
9.68 |
| 2026-02-07 12:00 |
18:45:11.13 |
-63:59:31.2 |
HIP 92121 |
9.26 |
| 2026-02-08 00:00 |
18:45:14.62 |
-63:59:41.0 |
HIP 92121 |
8.85 |
| 2026-02-08 12:00 |
18:45:18.09 |
-63:59:51.0 |
HIP 92121 |
8.44 |
| 2026-02-09 00:00 |
18:45:21.54 |
-64:00:01.2 |
HIP 92121 |
8.02 |
| 2026-02-09 12:00 |
18:45:24.96 |
-64:00:11.4 |
HIP 92121 |
7.61 |
| 2026-02-10 00:00 |
18:45:28.36 |
-64:00:21.9 |
HIP 92121 |
7.21 |
| 2026-02-10 12:00 |
18:45:31.74 |
-64:00:32.4 |
HIP 92121 |
6.80 |
| 2026-02-11 00:00 |
18:45:35.09 |
-64:00:43.1 |
HIP 92121 |
6.40 |
| 2026-02-11 12:00 |
18:45:38.42 |
-64:00:53.9 |
HIP 92121 |
6.00 |
| 2026-02-12 00:00 |
18:45:41.72 |
-64:01:04.8 |
HIP 92121 |
5.60 |
| 2026-02-12 12:00 |
18:45:45.00 |
-64:01:15.9 |
HIP 92121 |
5.21 |
| 2026-02-13 00:00 |
18:45:48.25 |
-64:01:27.1 |
HIP 92121 |
4.82 |
| 2026-02-13 12:00 |
18:45:51.48 |
-64:01:38.4 |
HIP 92121 |
4.44 |
| 2026-02-14 00:00 |
18:45:54.68 |
-64:01:49.9 |
HIP 92121 |
4.06 |
| 2026-02-14 12:00 |
18:45:57.86 |
-64:02:01.5 |
HIP 92121 |
3.69 |
| 2026-02-15 00:00 |
18:46:01.01 |
-64:02:13.2 |
HIP 92121 |
3.32 |
| 2026-02-15 12:00 |
18:46:04.13 |
-64:02:25.0 |
HIP 92121 |
2.97 |
| 2026-02-16 00:00 |
18:46:07.23 |
-64:02:37.0 |
HIP 92121 |
2.64 |
| 2026-02-16 12:00 |
18:46:10.30 |
-64:02:49.1 |
HIP 92121 |
2.32 |
| 2026-02-17 00:00 |
18:46:13.34 |
-64:03:01.3 |
HIP 92121 |
2.04 |
| 2026-02-17 12:00 |
18:46:16.35 |
-64:03:13.6 |
HIP 92121 |
1.80 |
| 2026-02-18 00:00 |
18:46:19.34 |
-64:03:26.1 |
HIP 92121 |
1.62 |
| 2026-02-18 12:00 |
18:46:22.30 |
-64:03:38.7 |
HIP 92121 |
1.52 |
| 2026-02-19 00:00 |
18:46:25.23 |
-64:03:51.4 |
HIP 92121 |
1.53 |
| 2026-02-19 12:00 |
18:46:28.13 |
-64:04:04.2 |
HIP 92121 |
1.63 |
| 2026-02-20 00:00 |
18:46:31.01 |
-64:04:17.1 |
HIP 92121 |
1.81 |
| 2026-02-20 12:00 |
18:46:33.85 |
-64:04:30.2 |
HIP 92121 |
2.04 |
| 2026-02-21 00:00 |
18:46:36.67 |
-64:04:43.4 |
HIP 92121 |
2.32 |
| 2026-02-21 12:00 |
18:46:39.45 |
-64:04:56.6 |
HIP 92121 |
2.62 |
| 2026-02-22 00:00 |
18:46:42.21 |
-64:05:10.0 |
HIP 92121 |
2.94 |
| 2026-02-22 12:00 |
18:46:44.94 |
-64:05:23.6 |
HIP 92121 |
3.27 |
| 2026-02-23 00:00 |
18:46:47.63 |
-64:05:37.2 |
HIP 92121 |
3.61 |
| 2026-02-23 12:00 |
18:46:50.30 |
-64:05:50.9 |
HIP 92121 |
3.96 |
| 2026-02-24 00:00 |
18:46:52.94 |
-64:06:04.8 |
HIP 92121 |
4.31 |