| Parameter |
Value |
| Designation |
C/2000 Y2 (Skiff) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-03-21T19:21:55.632960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
159 |
| NEO |
- |
| M1 |
14.400 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-02-15.0000000 |
| e |
0.99434819 |
| q (au) |
2.768707 |
| a (au) |
489.879307 |
| i (deg) |
12.087438 |
| Ω (om, deg) |
185.848328 |
| ω (w, deg) |
326.817997 |
| M (ma, deg) |
359.996836 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.823 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.823 |
| n |
2.000 |
| gf |
0.942 |
| gb |
-1.000 |
| k |
0.999 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
20:24:14.87 |
-08:33:21.7 |
HIP 100680 |
14.75 |
| 2026-03-26 12:00 |
20:24:16.25 |
-08:33:10.7 |
HIP 100680 |
14.75 |
| 2026-03-27 00:00 |
20:24:17.62 |
-08:32:59.7 |
HIP 100680 |
14.75 |
| 2026-03-27 12:00 |
20:24:18.96 |
-08:32:48.8 |
HIP 100680 |
14.77 |
| 2026-03-28 00:00 |
20:24:20.29 |
-08:32:37.9 |
HIP 100680 |
14.80 |
| 2026-03-28 12:00 |
20:24:21.59 |
-08:32:27.0 |
HIP 100680 |
14.84 |
| 2026-03-29 00:00 |
20:24:22.88 |
-08:32:16.2 |
HIP 100680 |
14.89 |
| 2026-03-29 12:00 |
20:24:24.15 |
-08:32:05.4 |
HIP 100680 |
14.95 |
| 2026-03-30 00:00 |
20:24:25.40 |
-08:31:54.6 |
HIP 100680 |
15.02 |
| 2026-03-30 12:00 |
20:24:26.63 |
-08:31:43.9 |
HIP 100680 |
15.10 |
| 2026-03-31 00:00 |
20:24:27.84 |
-08:31:33.3 |
HIP 100680 |
15.18 |
| 2026-03-31 12:00 |
20:24:29.02 |
-08:31:22.6 |
HIP 100680 |
15.28 |
| 2026-04-01 00:00 |
20:24:30.19 |
-08:31:12.1 |
HIP 100680 |
15.38 |
| 2026-04-01 12:00 |
20:24:31.34 |
-08:31:01.5 |
HIP 100680 |
15.49 |
| 2026-04-02 00:00 |
20:24:32.47 |
-08:30:51.0 |
HIP 100680 |
15.60 |
| 2026-04-02 12:00 |
20:24:33.58 |
-08:30:40.6 |
HIP 100680 |
15.72 |
| 2026-04-03 00:00 |
20:24:34.67 |
-08:30:30.2 |
HIP 100680 |
15.85 |
| 2026-04-03 12:00 |
20:24:35.74 |
-08:30:19.8 |
HIP 100680 |
15.98 |
| 2026-04-04 00:00 |
20:24:36.79 |
-08:30:09.5 |
HIP 100680 |
16.12 |
| 2026-04-04 12:00 |
20:24:37.82 |
-08:29:59.2 |
HIP 100680 |
16.26 |
| 2026-04-05 00:00 |
20:24:38.82 |
-08:29:49.0 |
HIP 100680 |
16.41 |
| 2026-04-05 12:00 |
20:24:39.81 |
-08:29:38.9 |
HIP 100680 |
16.56 |
| 2026-04-06 00:00 |
20:24:40.78 |
-08:29:28.8 |
HIP 100680 |
16.71 |
| 2026-04-06 12:00 |
20:24:41.72 |
-08:29:18.7 |
HIP 100680 |
16.87 |
| 2026-04-07 00:00 |
20:24:42.65 |
-08:29:08.7 |
HIP 100680 |
17.03 |
| 2026-04-07 12:00 |
20:24:43.56 |
-08:28:58.7 |
HIP 100680 |
17.19 |
| 2026-04-08 00:00 |
20:24:44.44 |
-08:28:48.8 |
HIP 100680 |
17.35 |
| 2026-04-08 12:00 |
20:24:45.30 |
-08:28:39.0 |
HIP 100680 |
17.52 |
| 2026-04-09 00:00 |
20:24:46.15 |
-08:28:29.2 |
HIP 100680 |
17.68 |
| 2026-04-09 12:00 |
20:24:46.97 |
-08:28:19.4 |
HIP 100680 |
17.85 |
| 2026-04-10 00:00 |
20:24:47.77 |
-08:28:09.7 |
HIP 100680 |
18.02 |
| 2026-04-10 12:00 |
20:24:48.55 |
-08:28:00.1 |
HIP 100680 |
18.19 |
| 2026-04-11 00:00 |
20:24:49.31 |
-08:27:50.5 |
HIP 100680 |
18.36 |
| 2026-04-11 12:00 |
20:24:50.04 |
-08:27:41.0 |
HIP 100680 |
18.53 |
| 2026-04-12 00:00 |
20:24:50.76 |
-08:27:31.6 |
HIP 100680 |
18.70 |
| 2026-04-12 12:00 |
20:24:51.45 |
-08:27:22.2 |
HIP 100680 |
18.88 |
| 2026-04-13 00:00 |
20:24:52.13 |
-08:27:12.8 |
HIP 100680 |
19.05 |
| 2026-04-13 12:00 |
20:24:52.78 |
-08:27:03.5 |
HIP 100680 |
19.22 |
| 2026-04-14 00:00 |
20:24:53.41 |
-08:26:54.3 |
HIP 100680 |
19.39 |
| 2026-04-14 12:00 |
20:24:54.02 |
-08:26:45.2 |
HIP 100680 |
19.56 |
| 2026-04-15 00:00 |
20:24:54.61 |
-08:26:36.1 |
HIP 100680 |
19.72 |
| 2026-04-15 12:00 |
20:24:55.17 |
-08:26:27.0 |
HIP 100680 |
19.89 |
| 2026-04-16 00:00 |
20:24:55.72 |
-08:26:18.1 |
HIP 100680 |
20.06 |