| Parameter |
Value |
| Designation |
C/1984 V1 (Levy-Rudenko) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1984-12-14T06:08:07.969920Z |
| Orbit solution date (soln_date, UTC) |
2022-04-11T23:22:27Z |
| Obs used |
162 |
| NEO |
- |
| M1 |
9.500 |
| K1 |
23.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1985-01-06.0000000 |
| e |
0.99921104 |
| q (au) |
0.917948 |
| a (au) |
1163.486000 |
| i (deg) |
65.714614 |
| Ω (om, deg) |
331.167739 |
| ω (w, deg) |
82.736865 |
| M (ma, deg) |
0.000565 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.012 + 3.636\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.012 |
| n |
3.636 |
| gf |
1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 1984-11-15 |
1984-12-14 |
+10.1838 |
+0.326 |
| 1984-12-14 |
1985-02-19 |
-0.0916 |
-0.071 |
| 1985-02-19 |
1985-04-10 |
+14.5027 |
-2.757 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
10:35:06.58 |
-58:45:19.0 |
HIP 52004 |
18.27 |
| 2026-03-26 12:00 |
10:35:03.70 |
-58:45:04.6 |
HIP 51623 |
18.36 |
| 2026-03-27 00:00 |
10:35:00.85 |
-58:44:50.0 |
HIP 51623 |
17.94 |
| 2026-03-27 12:00 |
10:34:58.00 |
-58:44:35.2 |
HIP 51623 |
17.52 |
| 2026-03-28 00:00 |
10:34:55.17 |
-58:44:20.2 |
HIP 51623 |
17.10 |
| 2026-03-28 12:00 |
10:34:52.35 |
-58:44:05.1 |
HIP 51623 |
16.68 |
| 2026-03-29 00:00 |
10:34:49.55 |
-58:43:49.8 |
HIP 51623 |
16.27 |
| 2026-03-29 12:00 |
10:34:46.77 |
-58:43:34.3 |
HIP 51623 |
15.86 |
| 2026-03-30 00:00 |
10:34:44.00 |
-58:43:18.6 |
HIP 51623 |
15.45 |
| 2026-03-30 12:00 |
10:34:41.24 |
-58:43:02.8 |
HIP 51623 |
15.05 |
| 2026-03-31 00:00 |
10:34:38.50 |
-58:42:46.8 |
HIP 51623 |
14.65 |
| 2026-03-31 12:00 |
10:34:35.78 |
-58:42:30.7 |
HIP 51623 |
14.25 |
| 2026-04-01 00:00 |
10:34:33.07 |
-58:42:14.4 |
HIP 51623 |
13.86 |
| 2026-04-01 12:00 |
10:34:30.38 |
-58:41:57.9 |
HIP 51623 |
13.47 |
| 2026-04-02 00:00 |
10:34:27.71 |
-58:41:41.3 |
HIP 51623 |
13.09 |
| 2026-04-02 12:00 |
10:34:25.05 |
-58:41:24.5 |
HIP 51623 |
12.71 |
| 2026-04-03 00:00 |
10:34:22.41 |
-58:41:07.5 |
HIP 51623 |
12.34 |
| 2026-04-03 12:00 |
10:34:19.78 |
-58:40:50.4 |
HIP 51623 |
11.98 |
| 2026-04-04 00:00 |
10:34:17.18 |
-58:40:33.1 |
HIP 51623 |
11.63 |
| 2026-04-04 12:00 |
10:34:14.59 |
-58:40:15.7 |
HIP 51623 |
11.28 |
| 2026-04-05 00:00 |
10:34:12.02 |
-58:39:58.1 |
HIP 51623 |
10.95 |
| 2026-04-05 12:00 |
10:34:09.46 |
-58:39:40.4 |
HIP 51623 |
10.62 |
| 2026-04-06 00:00 |
10:34:06.93 |
-58:39:22.5 |
HIP 51623 |
10.31 |
| 2026-04-06 12:00 |
10:34:04.41 |
-58:39:04.5 |
HIP 51623 |
10.00 |
| 2026-04-07 00:00 |
10:34:01.91 |
-58:38:46.3 |
HIP 51623 |
9.71 |
| 2026-04-07 12:00 |
10:33:59.43 |
-58:38:28.0 |
HIP 51623 |
9.44 |
| 2026-04-08 00:00 |
10:33:56.97 |
-58:38:09.5 |
HIP 51623 |
9.18 |
| 2026-04-08 12:00 |
10:33:54.52 |
-58:37:50.9 |
HIP 51623 |
8.94 |
| 2026-04-09 00:00 |
10:33:52.10 |
-58:37:32.1 |
HIP 51623 |
8.72 |
| 2026-04-09 12:00 |
10:33:49.70 |
-58:37:13.2 |
HIP 51623 |
8.52 |
| 2026-04-10 00:00 |
10:33:47.31 |
-58:36:54.2 |
HIP 51623 |
8.34 |
| 2026-04-10 12:00 |
10:33:44.94 |
-58:36:35.0 |
HIP 51653 |
8.01 |
| 2026-04-11 00:00 |
10:33:42.60 |
-58:36:15.7 |
HIP 51653 |
7.57 |
| 2026-04-11 12:00 |
10:33:40.27 |
-58:35:56.3 |
HIP 51653 |
7.14 |
| 2026-04-12 00:00 |
10:33:37.97 |
-58:35:36.7 |
HIP 51653 |
6.70 |
| 2026-04-12 12:00 |
10:33:35.68 |
-58:35:17.0 |
HIP 51653 |
6.27 |
| 2026-04-13 00:00 |
10:33:33.42 |
-58:34:57.1 |
HIP 51653 |
5.83 |
| 2026-04-13 12:00 |
10:33:31.17 |
-58:34:37.2 |
HIP 51653 |
5.40 |
| 2026-04-14 00:00 |
10:33:28.95 |
-58:34:17.1 |
HIP 51653 |
4.96 |
| 2026-04-14 12:00 |
10:33:26.74 |
-58:33:56.9 |
HIP 51653 |
4.53 |
| 2026-04-15 00:00 |
10:33:24.56 |
-58:33:36.5 |
HIP 51653 |
4.10 |
| 2026-04-15 12:00 |
10:33:22.40 |
-58:33:16.1 |
HIP 51653 |
3.67 |
| 2026-04-16 00:00 |
10:33:20.26 |
-58:32:55.5 |
HIP 51653 |
3.25 |