P/2011 Y2 (Boattini)
| Parameter |
Value |
| Designation |
P/2011 Y2 (Boattini) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2012-03-21T16:42:15.212160Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:59Z |
| Obs used |
92 |
| NEO |
- |
| M1 |
13.600 |
| K1 |
16.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-12-28.0000000 |
| e |
0.71292045 |
| q (au) |
1.787148 |
| a (au) |
6.225270 |
| i (deg) |
6.351399 |
| Ω (om, deg) |
310.018388 |
| ω (w, deg) |
131.187614 |
| M (ma, deg) |
354.625603 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.174 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.174 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.518 |
| k |
1.000 |
| δ90 |
5.312 |
| 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 |
21:07:55.26 |
-15:55:40.7 |
HIP 104321 |
18.27 |
| 2026-02-03 12:00 |
21:08:19.99 |
-15:53:41.7 |
HIP 104321 |
17.09 |
| 2026-02-04 00:00 |
21:08:44.75 |
-15:51:42.4 |
HIP 104321 |
18.14 |
| 2026-02-04 12:00 |
21:09:09.51 |
-15:49:42.7 |
HIP 104505 |
15.96 |
| 2026-02-05 00:00 |
21:09:34.29 |
-15:47:42.8 |
HIP 104505 |
9.81 |
| 2026-02-05 12:00 |
21:09:59.08 |
-15:45:42.6 |
HIP 104505 |
4.11 |
| 2026-02-06 00:00 |
21:10:23.88 |
-15:43:42.0 |
HIP 104505 |
4.09 |
| 2026-02-06 12:00 |
21:10:48.69 |
-15:41:41.2 |
HIP 104505 |
9.79 |
| 2026-02-07 00:00 |
21:11:13.52 |
-15:39:40.1 |
HIP 104505 |
15.96 |
| 2026-02-07 12:00 |
21:11:38.35 |
-15:37:38.7 |
HIP 104713 |
20.16 |
| 2026-02-08 00:00 |
21:12:03.19 |
-15:35:37.0 |
HIP 104713 |
17.85 |
| 2026-02-08 12:00 |
21:12:28.04 |
-15:33:35.0 |
HIP 104713 |
17.62 |
| 2026-02-09 00:00 |
21:12:52.90 |
-15:31:32.8 |
HIP 104713 |
19.55 |
| 2026-02-09 12:00 |
21:13:17.76 |
-15:29:30.2 |
HIP 104713 |
23.12 |
| 2026-02-10 00:00 |
21:13:42.63 |
-15:27:27.4 |
HIP 104922 |
27.37 |
| 2026-02-10 12:00 |
21:14:07.51 |
-15:25:24.3 |
HIP 104918 |
23.39 |
| 2026-02-11 00:00 |
21:14:32.39 |
-15:23:21.0 |
HIP 104918 |
18.24 |
| 2026-02-11 12:00 |
21:14:57.27 |
-15:21:17.3 |
HIP 104918 |
14.10 |
| 2026-02-12 00:00 |
21:15:22.16 |
-15:19:13.4 |
HIP 104974 |
10.47 |
| 2026-02-12 12:00 |
21:15:47.05 |
-15:17:09.3 |
HIP 104974 |
6.89 |
| 2026-02-13 00:00 |
21:16:11.94 |
-15:15:04.9 |
HIP 104974 |
8.11 |
| 2026-02-13 12:00 |
21:16:36.84 |
-15:13:00.2 |
HIP 104974 |
12.84 |
| 2026-02-14 00:00 |
21:17:01.73 |
-15:10:55.3 |
HIP 104974 |
18.57 |
| 2026-02-14 12:00 |
21:17:26.62 |
-15:08:50.1 |
HIP 105042 |
22.98 |
| 2026-02-15 00:00 |
21:17:51.52 |
-15:06:44.7 |
HIP 105285 |
24.35 |
| 2026-02-15 12:00 |
21:18:16.41 |
-15:04:39.1 |
HIP 105285 |
18.50 |
| 2026-02-16 00:00 |
21:18:41.30 |
-15:02:33.2 |
HIP 105285 |
13.12 |
| 2026-02-16 12:00 |
21:19:06.19 |
-15:00:27.0 |
HIP 105285 |
9.12 |
| 2026-02-17 00:00 |
21:19:31.07 |
-14:58:20.7 |
HIP 105285 |
8.68 |
| 2026-02-17 12:00 |
21:19:55.94 |
-14:56:14.1 |
HIP 105285 |
12.19 |
| 2026-02-18 00:00 |
21:20:20.82 |
-14:54:07.3 |
HIP 105285 |
17.40 |
| 2026-02-18 12:00 |
21:20:45.68 |
-14:52:00.2 |
HIP 105519 |
22.16 |
| 2026-02-19 00:00 |
21:21:10.54 |
-14:49:53.0 |
HIP 105519 |
16.79 |
| 2026-02-19 12:00 |
21:21:35.39 |
-14:47:45.5 |
HIP 105519 |
12.39 |
| 2026-02-20 00:00 |
21:22:00.24 |
-14:45:37.9 |
HIP 105519 |
10.32 |
| 2026-02-20 12:00 |
21:22:25.07 |
-14:43:30.0 |
HIP 105519 |
11.86 |
| 2026-02-21 00:00 |
21:22:49.89 |
-14:41:21.9 |
HIP 105519 |
16.00 |
| 2026-02-21 12:00 |
21:23:14.71 |
-14:39:13.6 |
HIP 105519 |
21.27 |
| 2026-02-22 00:00 |
21:23:39.51 |
-14:37:05.2 |
HIP 105519 |
27.02 |
| 2026-02-22 12:00 |
21:24:04.30 |
-14:34:56.5 |
HIP 105782 |
26.75 |
| 2026-02-23 00:00 |
21:24:29.08 |
-14:32:47.6 |
HIP 105782 |
21.06 |
| 2026-02-23 12:00 |
21:24:53.84 |
-14:30:38.6 |
HIP 105782 |
15.90 |
| 2026-02-24 00:00 |
21:25:18.59 |
-14:28:29.4 |
HIP 105782 |
11.95 |