C/1984 V1 (Levy-Rudenko)
| 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
$$
M_a = (8.010 + 3.640\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.010 |
| n |
3.640 |
| 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 |
+9.9741 |
+0.320 |
| 1984-12-14 |
1985-03-12 |
+0.2982 |
-0.081 |
| 1985-03-12 |
1985-04-10 |
+19.8965 |
-4.442 |
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 |
10:40:28.09 |
-58:51:33.7 |
HIP 52331 |
10.50 |
| 2026-02-03 12:00 |
10:40:25.12 |
-58:51:41.2 |
HIP 52331 |
10.89 |
| 2026-02-04 00:00 |
10:40:22.14 |
-58:51:48.5 |
HIP 52133 |
10.64 |
| 2026-02-04 12:00 |
10:40:19.15 |
-58:51:55.7 |
HIP 52133 |
10.30 |
| 2026-02-05 00:00 |
10:40:16.14 |
-58:52:02.6 |
HIP 52133 |
9.96 |
| 2026-02-05 12:00 |
10:40:13.12 |
-58:52:09.2 |
HIP 52133 |
9.63 |
| 2026-02-06 00:00 |
10:40:10.09 |
-58:52:15.7 |
HIP 52133 |
9.30 |
| 2026-02-06 12:00 |
10:40:07.05 |
-58:52:21.9 |
HIP 52133 |
8.97 |
| 2026-02-07 00:00 |
10:40:04.00 |
-58:52:27.9 |
HIP 52133 |
8.65 |
| 2026-02-07 12:00 |
10:40:00.93 |
-58:52:33.7 |
HIP 52133 |
8.33 |
| 2026-02-08 00:00 |
10:39:57.86 |
-58:52:39.3 |
HIP 52133 |
8.02 |
| 2026-02-08 12:00 |
10:39:54.78 |
-58:52:44.6 |
HIP 52133 |
7.71 |
| 2026-02-09 00:00 |
10:39:51.69 |
-58:52:49.8 |
HIP 52133 |
7.41 |
| 2026-02-09 12:00 |
10:39:48.58 |
-58:52:54.6 |
HIP 52133 |
7.12 |
| 2026-02-10 00:00 |
10:39:45.47 |
-58:52:59.3 |
HIP 52133 |
6.83 |
| 2026-02-10 12:00 |
10:39:42.35 |
-58:53:03.8 |
HIP 52133 |
6.56 |
| 2026-02-11 00:00 |
10:39:39.22 |
-58:53:08.0 |
HIP 52133 |
6.29 |
| 2026-02-11 12:00 |
10:39:36.08 |
-58:53:12.0 |
HIP 52133 |
6.04 |
| 2026-02-12 00:00 |
10:39:32.93 |
-58:53:15.7 |
HIP 52133 |
5.81 |
| 2026-02-12 12:00 |
10:39:29.78 |
-58:53:19.3 |
HIP 52133 |
5.59 |
| 2026-02-13 00:00 |
10:39:26.61 |
-58:53:22.6 |
HIP 52133 |
5.39 |
| 2026-02-13 12:00 |
10:39:23.44 |
-58:53:25.7 |
HIP 52133 |
5.22 |
| 2026-02-14 00:00 |
10:39:20.26 |
-58:53:28.5 |
HIP 52133 |
5.06 |
| 2026-02-14 12:00 |
10:39:17.08 |
-58:53:31.2 |
HIP 52133 |
4.93 |
| 2026-02-15 00:00 |
10:39:13.89 |
-58:53:33.6 |
HIP 52133 |
4.83 |
| 2026-02-15 12:00 |
10:39:10.69 |
-58:53:35.7 |
HIP 52133 |
4.77 |
| 2026-02-16 00:00 |
10:39:07.48 |
-58:53:37.7 |
HIP 52127 |
4.72 |
| 2026-02-16 12:00 |
10:39:04.27 |
-58:53:39.4 |
HIP 52127 |
4.68 |
| 2026-02-17 00:00 |
10:39:01.06 |
-58:53:40.9 |
HIP 52127 |
4.67 |
| 2026-02-17 12:00 |
10:38:57.84 |
-58:53:42.1 |
HIP 52127 |
4.70 |
| 2026-02-18 00:00 |
10:38:54.61 |
-58:53:43.2 |
HIP 52127 |
4.75 |
| 2026-02-18 12:00 |
10:38:51.38 |
-58:53:44.0 |
HIP 52127 |
4.84 |
| 2026-02-19 00:00 |
10:38:48.14 |
-58:53:44.5 |
HIP 52127 |
4.96 |
| 2026-02-19 12:00 |
10:38:44.90 |
-58:53:44.9 |
HIP 52127 |
5.11 |
| 2026-02-20 00:00 |
10:38:41.66 |
-58:53:45.0 |
HIP 52127 |
5.28 |
| 2026-02-20 12:00 |
10:38:38.41 |
-58:53:44.9 |
HIP 52127 |
5.48 |
| 2026-02-21 00:00 |
10:38:35.16 |
-58:53:44.5 |
HIP 52127 |
5.69 |
| 2026-02-21 12:00 |
10:38:31.91 |
-58:53:43.9 |
HIP 52127 |
5.93 |
| 2026-02-22 00:00 |
10:38:28.65 |
-58:53:43.1 |
HIP 52127 |
6.19 |
| 2026-02-22 12:00 |
10:38:25.39 |
-58:53:42.1 |
HIP 52127 |
6.46 |
| 2026-02-23 00:00 |
10:38:22.13 |
-58:53:40.8 |
HIP 52127 |
6.74 |
| 2026-02-23 12:00 |
10:38:18.87 |
-58:53:39.4 |
HIP 52127 |
7.03 |
| 2026-02-24 00:00 |
10:38:15.60 |
-58:53:37.6 |
HIP 52127 |
7.34 |