C/2000 Y2 (Skiff)
| 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) |
| 2026-02-03 00:00 |
20:20:34.67 |
-08:52:43.0 |
HIP 100235 |
28.25 |
| 2026-02-03 12:00 |
20:20:37.34 |
-08:52:32.7 |
HIP 100235 |
28.38 |
| 2026-02-04 00:00 |
20:20:40.00 |
-08:52:22.3 |
HIP 100235 |
28.53 |
| 2026-02-04 12:00 |
20:20:42.66 |
-08:52:11.9 |
HIP 100481 |
27.88 |
| 2026-02-05 00:00 |
20:20:45.31 |
-08:52:01.5 |
HIP 100481 |
27.21 |
| 2026-02-05 12:00 |
20:20:47.96 |
-08:51:51.0 |
HIP 100481 |
26.54 |
| 2026-02-06 00:00 |
20:20:50.60 |
-08:51:40.4 |
HIP 100481 |
25.88 |
| 2026-02-06 12:00 |
20:20:53.24 |
-08:51:29.8 |
HIP 100481 |
25.21 |
| 2026-02-07 00:00 |
20:20:55.87 |
-08:51:19.2 |
HIP 100481 |
24.55 |
| 2026-02-07 12:00 |
20:20:58.50 |
-08:51:08.5 |
HIP 100481 |
23.89 |
| 2026-02-08 00:00 |
20:21:01.12 |
-08:50:57.8 |
HIP 100481 |
23.23 |
| 2026-02-08 12:00 |
20:21:03.74 |
-08:50:47.0 |
HIP 100481 |
22.58 |
| 2026-02-09 00:00 |
20:21:06.35 |
-08:50:36.2 |
HIP 100481 |
21.93 |
| 2026-02-09 12:00 |
20:21:08.95 |
-08:50:25.4 |
HIP 100481 |
21.28 |
| 2026-02-10 00:00 |
20:21:11.54 |
-08:50:14.5 |
HIP 100481 |
20.63 |
| 2026-02-10 12:00 |
20:21:14.13 |
-08:50:03.6 |
HIP 100481 |
19.98 |
| 2026-02-11 00:00 |
20:21:16.71 |
-08:49:52.6 |
HIP 100481 |
19.34 |
| 2026-02-11 12:00 |
20:21:19.29 |
-08:49:41.6 |
HIP 100481 |
18.70 |
| 2026-02-12 00:00 |
20:21:21.86 |
-08:49:30.6 |
HIP 100481 |
18.07 |
| 2026-02-12 12:00 |
20:21:24.42 |
-08:49:19.5 |
HIP 100481 |
17.44 |
| 2026-02-13 00:00 |
20:21:26.97 |
-08:49:08.4 |
HIP 100481 |
16.81 |
| 2026-02-13 12:00 |
20:21:29.51 |
-08:48:57.3 |
HIP 100481 |
16.19 |
| 2026-02-14 00:00 |
20:21:32.05 |
-08:48:46.1 |
HIP 100481 |
15.57 |
| 2026-02-14 12:00 |
20:21:34.58 |
-08:48:34.9 |
HIP 100481 |
14.95 |
| 2026-02-15 00:00 |
20:21:37.10 |
-08:48:23.7 |
HIP 100481 |
14.35 |
| 2026-02-15 12:00 |
20:21:39.61 |
-08:48:12.4 |
HIP 100481 |
13.74 |
| 2026-02-16 00:00 |
20:21:42.11 |
-08:48:01.1 |
HIP 100481 |
13.15 |
| 2026-02-16 12:00 |
20:21:44.60 |
-08:47:49.8 |
HIP 100481 |
12.56 |
| 2026-02-17 00:00 |
20:21:47.09 |
-08:47:38.5 |
HIP 100481 |
11.98 |
| 2026-02-17 12:00 |
20:21:49.56 |
-08:47:27.1 |
HIP 100481 |
11.41 |
| 2026-02-18 00:00 |
20:21:52.03 |
-08:47:15.7 |
HIP 100481 |
10.85 |
| 2026-02-18 12:00 |
20:21:54.48 |
-08:47:04.3 |
HIP 100481 |
10.30 |
| 2026-02-19 00:00 |
20:21:56.93 |
-08:46:52.8 |
HIP 100481 |
9.77 |
| 2026-02-19 12:00 |
20:21:59.36 |
-08:46:41.3 |
HIP 100481 |
9.24 |
| 2026-02-20 00:00 |
20:22:01.79 |
-08:46:29.9 |
HIP 100481 |
8.74 |
| 2026-02-20 12:00 |
20:22:04.20 |
-08:46:18.3 |
HIP 100481 |
8.25 |
| 2026-02-21 00:00 |
20:22:06.61 |
-08:46:06.8 |
HIP 100481 |
7.79 |
| 2026-02-21 12:00 |
20:22:09.00 |
-08:45:55.2 |
HIP 100481 |
7.36 |
| 2026-02-22 00:00 |
20:22:11.39 |
-08:45:43.7 |
HIP 100481 |
6.95 |
| 2026-02-22 12:00 |
20:22:13.76 |
-08:45:32.1 |
HIP 100481 |
6.58 |
| 2026-02-23 00:00 |
20:22:16.12 |
-08:45:20.5 |
HIP 100481 |
6.26 |
| 2026-02-23 12:00 |
20:22:18.47 |
-08:45:08.8 |
HIP 100481 |
5.98 |
| 2026-02-24 00:00 |
20:22:20.81 |
-08:44:57.2 |
HIP 100481 |
5.75 |