C/2000 Y1 (Tubbiolo)
| Parameter |
Value |
| Designation |
C/2000 Y1 (Tubbiolo) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-02-02T03:45:55.477440Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:08Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2001-05-01.0000000 |
| e |
1.00234998 |
| q (au) |
7.974764 |
| a (au) |
-3393.538738 |
| i (deg) |
137.974246 |
| Ω (om, deg) |
239.394833 |
| ω (w, deg) |
181.732505 |
| M (ma, deg) |
0.000438 |
Magnitude
Scatter + Global Linear
$$
M_a = (9.458 + 2.166\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
9.458 |
| n |
2.166 |
| gf |
0.979 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.922 |
| 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 |
19:09:49.85 |
-53:06:19.6 |
HIP 93978 |
21.53 |
| 2026-02-03 12:00 |
19:09:53.58 |
-53:06:24.4 |
HIP 94310 |
21.21 |
| 2026-02-04 00:00 |
19:09:57.30 |
-53:06:29.3 |
HIP 94310 |
20.72 |
| 2026-02-04 12:00 |
19:10:00.99 |
-53:06:34.4 |
HIP 94310 |
20.24 |
| 2026-02-05 00:00 |
19:10:04.67 |
-53:06:39.7 |
HIP 94310 |
19.76 |
| 2026-02-05 12:00 |
19:10:08.33 |
-53:06:45.1 |
HIP 94310 |
19.28 |
| 2026-02-06 00:00 |
19:10:11.97 |
-53:06:50.7 |
HIP 94310 |
18.81 |
| 2026-02-06 12:00 |
19:10:15.58 |
-53:06:56.5 |
HIP 94310 |
18.35 |
| 2026-02-07 00:00 |
19:10:19.18 |
-53:07:02.5 |
HIP 94310 |
17.88 |
| 2026-02-07 12:00 |
19:10:22.76 |
-53:07:08.7 |
HIP 94310 |
17.43 |
| 2026-02-08 00:00 |
19:10:26.31 |
-53:07:15.0 |
HIP 94310 |
16.98 |
| 2026-02-08 12:00 |
19:10:29.85 |
-53:07:21.5 |
HIP 94310 |
16.53 |
| 2026-02-09 00:00 |
19:10:33.36 |
-53:07:28.2 |
HIP 94310 |
16.09 |
| 2026-02-09 12:00 |
19:10:36.86 |
-53:07:35.0 |
HIP 94310 |
15.66 |
| 2026-02-10 00:00 |
19:10:40.33 |
-53:07:42.0 |
HIP 94310 |
15.23 |
| 2026-02-10 12:00 |
19:10:43.77 |
-53:07:49.2 |
HIP 94310 |
14.81 |
| 2026-02-11 00:00 |
19:10:47.20 |
-53:07:56.6 |
HIP 94310 |
14.40 |
| 2026-02-11 12:00 |
19:10:50.60 |
-53:08:04.1 |
HIP 94310 |
13.99 |
| 2026-02-12 00:00 |
19:10:53.98 |
-53:08:11.8 |
HIP 94310 |
13.59 |
| 2026-02-12 12:00 |
19:10:57.34 |
-53:08:19.7 |
HIP 94310 |
13.20 |
| 2026-02-13 00:00 |
19:11:00.67 |
-53:08:27.7 |
HIP 94310 |
12.82 |
| 2026-02-13 12:00 |
19:11:03.98 |
-53:08:36.0 |
HIP 94310 |
12.45 |
| 2026-02-14 00:00 |
19:11:07.26 |
-53:08:44.4 |
HIP 94310 |
12.09 |
| 2026-02-14 12:00 |
19:11:10.52 |
-53:08:52.9 |
HIP 94310 |
11.74 |
| 2026-02-15 00:00 |
19:11:13.75 |
-53:09:01.6 |
HIP 94310 |
11.39 |
| 2026-02-15 12:00 |
19:11:16.96 |
-53:09:10.5 |
HIP 94310 |
11.06 |
| 2026-02-16 00:00 |
19:11:20.14 |
-53:09:19.6 |
HIP 94310 |
10.75 |
| 2026-02-16 12:00 |
19:11:23.30 |
-53:09:28.8 |
HIP 94310 |
10.44 |
| 2026-02-17 00:00 |
19:11:26.43 |
-53:09:38.2 |
HIP 94310 |
10.15 |
| 2026-02-17 12:00 |
19:11:29.54 |
-53:09:47.8 |
HIP 94310 |
9.87 |
| 2026-02-18 00:00 |
19:11:32.62 |
-53:09:57.5 |
HIP 94310 |
9.61 |
| 2026-02-18 12:00 |
19:11:35.67 |
-53:10:07.4 |
HIP 94310 |
9.37 |
| 2026-02-19 00:00 |
19:11:38.70 |
-53:10:17.4 |
HIP 94310 |
9.14 |
| 2026-02-19 12:00 |
19:11:41.69 |
-53:10:27.6 |
HIP 94310 |
8.93 |
| 2026-02-20 00:00 |
19:11:44.67 |
-53:10:38.0 |
HIP 94310 |
8.73 |
| 2026-02-20 12:00 |
19:11:47.61 |
-53:10:48.5 |
HIP 94310 |
8.56 |
| 2026-02-21 00:00 |
19:11:50.52 |
-53:10:59.2 |
HIP 94310 |
8.41 |
| 2026-02-21 12:00 |
19:11:53.41 |
-53:11:10.0 |
HIP 94310 |
8.28 |
| 2026-02-22 00:00 |
19:11:56.26 |
-53:11:21.0 |
HIP 94310 |
8.17 |
| 2026-02-22 12:00 |
19:11:59.09 |
-53:11:32.2 |
HIP 94310 |
8.08 |
| 2026-02-23 00:00 |
19:12:01.89 |
-53:11:43.5 |
HIP 94310 |
8.01 |
| 2026-02-23 12:00 |
19:12:04.66 |
-53:11:55.0 |
HIP 94310 |
7.97 |
| 2026-02-24 00:00 |
19:12:07.40 |
-53:12:06.6 |
HIP 94310 |
7.94 |