| Parameter |
Value |
| Designation |
122P/de Vico |
| Type |
P |
| Perihelion (tp_cal, UTC) |
1995-10-06T00:00:14.981760Z |
| Orbit solution date (soln_date, UTC) |
2001-07-02T16:09:03Z |
| Obs used |
294 |
| NEO |
Yes |
| M1 |
7.500 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1996-07-16.0000000 |
| e |
0.96270889 |
| q (au) |
0.659337 |
| a (au) |
17.680817 |
| i (deg) |
85.382753 |
| Ω (om, deg) |
79.624501 |
| ω (w, deg) |
12.996092 |
| M (ma, deg) |
3.765032 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.029 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.029 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.800 |
| 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 |
| 1995-09-18 |
1995-10-05 |
+0.7319 |
+0.214 |
| 1995-10-06 |
1995-11-26 |
-3.7764 |
-0.479 |
| 1995-11-26 |
1996-01-26 |
+4.5518 |
-1.150 |
| 1996-01-26 |
1996-06-25 |
+14.1222 |
-4.275 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
17:07:04.86 |
-33:44:56.8 |
HIP 83861 |
17.29 |
| 2026-09-25 12:00 |
17:07:05.93 |
-33:44:50.3 |
HIP 83861 |
17.13 |
| 2026-09-26 00:00 |
17:07:07.03 |
-33:44:43.9 |
HIP 83861 |
16.97 |
| 2026-09-26 12:00 |
17:07:08.16 |
-33:44:37.5 |
HIP 83861 |
16.80 |
| 2026-09-27 00:00 |
17:07:09.32 |
-33:44:31.2 |
HIP 83861 |
16.63 |
| 2026-09-27 12:00 |
17:07:10.52 |
-33:44:25.0 |
HIP 83861 |
16.45 |
| 2026-09-28 00:00 |
17:07:11.75 |
-33:44:18.8 |
HIP 83861 |
16.28 |
| 2026-09-28 12:00 |
17:07:13.01 |
-33:44:12.7 |
HIP 83861 |
16.09 |
| 2026-09-29 00:00 |
17:07:14.31 |
-33:44:06.6 |
HIP 83861 |
15.91 |
| 2026-09-29 12:00 |
17:07:15.64 |
-33:44:00.7 |
HIP 83861 |
15.72 |
| 2026-09-30 00:00 |
17:07:17.00 |
-33:43:54.7 |
HIP 83861 |
15.52 |
| 2026-09-30 12:00 |
17:07:18.39 |
-33:43:48.9 |
HIP 83861 |
15.33 |
| 2026-10-01 00:00 |
17:07:19.82 |
-33:43:43.1 |
HIP 83861 |
15.13 |
| 2026-10-01 12:00 |
17:07:21.28 |
-33:43:37.4 |
HIP 83861 |
14.93 |
| 2026-10-02 00:00 |
17:07:22.77 |
-33:43:31.7 |
HIP 83861 |
14.72 |
| 2026-10-02 12:00 |
17:07:24.30 |
-33:43:26.2 |
HIP 83861 |
14.52 |
| 2026-10-03 00:00 |
17:07:25.86 |
-33:43:20.6 |
HIP 83861 |
14.31 |
| 2026-10-03 12:00 |
17:07:27.45 |
-33:43:15.2 |
HIP 83861 |
14.11 |
| 2026-10-04 00:00 |
17:07:29.07 |
-33:43:09.8 |
HIP 83861 |
13.90 |
| 2026-10-04 12:00 |
17:07:30.72 |
-33:43:04.5 |
HIP 83861 |
13.69 |
| 2026-10-05 00:00 |
17:07:32.40 |
-33:42:59.3 |
HIP 83861 |
13.48 |
| 2026-10-05 12:00 |
17:07:34.12 |
-33:42:54.1 |
HIP 83861 |
13.28 |
| 2026-10-06 00:00 |
17:07:35.87 |
-33:42:49.0 |
HIP 83861 |
13.07 |
| 2026-10-06 12:00 |
17:07:37.65 |
-33:42:44.0 |
HIP 83861 |
12.87 |
| 2026-10-07 00:00 |
17:07:39.46 |
-33:42:39.0 |
HIP 83861 |
12.67 |
| 2026-10-07 12:00 |
17:07:41.30 |
-33:42:34.1 |
HIP 83861 |
12.47 |
| 2026-10-08 00:00 |
17:07:43.18 |
-33:42:29.3 |
HIP 83861 |
12.28 |
| 2026-10-08 12:00 |
17:07:45.08 |
-33:42:24.6 |
HIP 83861 |
12.09 |
| 2026-10-09 00:00 |
17:07:47.02 |
-33:42:19.9 |
HIP 83861 |
11.91 |
| 2026-10-09 12:00 |
17:07:48.99 |
-33:42:15.3 |
HIP 83861 |
11.74 |
| 2026-10-10 00:00 |
17:07:50.98 |
-33:42:10.8 |
HIP 83861 |
11.57 |
| 2026-10-10 12:00 |
17:07:53.01 |
-33:42:06.4 |
HIP 83861 |
11.41 |
| 2026-10-11 00:00 |
17:07:55.07 |
-33:42:02.0 |
HIP 83861 |
11.26 |
| 2026-10-11 12:00 |
17:07:57.16 |
-33:41:57.7 |
HIP 83861 |
11.13 |
| 2026-10-12 00:00 |
17:07:59.27 |
-33:41:53.5 |
HIP 83861 |
11.00 |
| 2026-10-12 12:00 |
17:08:01.42 |
-33:41:49.3 |
HIP 83861 |
10.89 |
| 2026-10-13 00:00 |
17:08:03.60 |
-33:41:45.3 |
HIP 83861 |
10.79 |
| 2026-10-13 12:00 |
17:08:05.80 |
-33:41:41.3 |
HIP 83861 |
10.71 |
| 2026-10-14 00:00 |
17:08:08.04 |
-33:41:37.3 |
HIP 83861 |
10.65 |
| 2026-10-14 12:00 |
17:08:10.30 |
-33:41:33.5 |
HIP 83861 |
10.60 |
| 2026-10-15 00:00 |
17:08:12.60 |
-33:41:29.7 |
HIP 83861 |
10.57 |
| 2026-10-15 12:00 |
17:08:14.92 |
-33:41:26.0 |
HIP 83861 |
10.56 |
| 2026-10-16 00:00 |
17:08:17.27 |
-33:41:22.4 |
HIP 83861 |
10.58 |