| 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) |
| 2026-05-12 00:00 |
22:19:20.57 |
-09:01:42.7 |
HIP 110338 |
27.42 |
| 2026-05-12 12:00 |
22:19:35.03 |
-08:59:56.5 |
HIP 110338 |
23.49 |
| 2026-05-13 00:00 |
22:19:49.36 |
-08:58:10.8 |
HIP 110338 |
19.61 |
| 2026-05-13 12:00 |
22:20:03.57 |
-08:56:25.7 |
HIP 110338 |
15.80 |
| 2026-05-14 00:00 |
22:20:17.64 |
-08:54:41.2 |
HIP 110338 |
12.08 |
| 2026-05-14 12:00 |
22:20:31.58 |
-08:52:57.3 |
HIP 110338 |
8.56 |
| 2026-05-15 00:00 |
22:20:45.39 |
-08:51:14.0 |
HIP 110338 |
5.50 |
| 2026-05-15 12:00 |
22:20:59.07 |
-08:49:31.2 |
HIP 110338 |
4.07 |
| 2026-05-16 00:00 |
22:21:12.61 |
-08:47:49.1 |
HIP 110338 |
5.58 |
| 2026-05-16 12:00 |
22:21:26.02 |
-08:46:07.6 |
HIP 110338 |
8.57 |
| 2026-05-17 00:00 |
22:21:39.30 |
-08:44:26.7 |
HIP 110427 |
5.68 |
| 2026-05-17 12:00 |
22:21:52.43 |
-08:42:46.5 |
HIP 110427 |
3.17 |
| 2026-05-18 00:00 |
22:22:05.43 |
-08:41:06.9 |
HIP 110427 |
3.80 |
| 2026-05-18 12:00 |
22:22:18.29 |
-08:39:27.9 |
HIP 110427 |
6.67 |
| 2026-05-19 00:00 |
22:22:31.01 |
-08:37:49.5 |
HIP 110427 |
9.98 |
| 2026-05-19 12:00 |
22:22:43.59 |
-08:36:11.9 |
HIP 110427 |
13.38 |
| 2026-05-20 00:00 |
22:22:56.03 |
-08:34:34.8 |
HIP 110427 |
16.79 |
| 2026-05-20 12:00 |
22:23:08.32 |
-08:32:58.5 |
HIP 110427 |
20.18 |
| 2026-05-21 00:00 |
22:23:20.47 |
-08:31:22.8 |
HIP 110427 |
23.56 |
| 2026-05-21 12:00 |
22:23:32.48 |
-08:29:47.8 |
HIP 110427 |
26.90 |
| 2026-05-22 00:00 |
22:23:44.34 |
-08:28:13.5 |
HIP 110612 |
24.94 |
| 2026-05-22 12:00 |
22:23:56.06 |
-08:26:39.8 |
HIP 110612 |
22.25 |
| 2026-05-23 00:00 |
22:24:07.63 |
-08:25:06.9 |
HIP 110612 |
19.75 |
| 2026-05-23 12:00 |
22:24:19.05 |
-08:23:34.6 |
HIP 110612 |
17.53 |
| 2026-05-24 00:00 |
22:24:30.33 |
-08:22:03.1 |
HIP 110612 |
15.67 |
| 2026-05-24 12:00 |
22:24:41.45 |
-08:20:32.3 |
HIP 110612 |
14.29 |
| 2026-05-25 00:00 |
22:24:52.43 |
-08:19:02.1 |
HIP 110612 |
13.52 |
| 2026-05-25 12:00 |
22:25:03.26 |
-08:17:32.8 |
HIP 110612 |
13.42 |
| 2026-05-26 00:00 |
22:25:13.93 |
-08:16:04.1 |
HIP 110612 |
13.99 |
| 2026-05-26 12:00 |
22:25:24.45 |
-08:14:36.2 |
HIP 110612 |
15.12 |
| 2026-05-27 00:00 |
22:25:34.82 |
-08:13:09.0 |
HIP 110612 |
16.70 |
| 2026-05-27 12:00 |
22:25:45.03 |
-08:11:42.5 |
HIP 110612 |
18.57 |
| 2026-05-28 00:00 |
22:25:55.09 |
-08:10:16.8 |
HIP 110612 |
20.66 |
| 2026-05-28 12:00 |
22:26:04.99 |
-08:08:51.9 |
HIP 110612 |
22.87 |
| 2026-05-29 00:00 |
22:26:14.73 |
-08:07:27.7 |
HIP 110792 |
24.53 |
| 2026-05-29 12:00 |
22:26:24.32 |
-08:06:04.3 |
HIP 110792 |
25.22 |
| 2026-05-30 00:00 |
22:26:33.75 |
-08:04:41.7 |
HIP 110792 |
26.17 |
| 2026-05-30 12:00 |
22:26:43.02 |
-08:03:19.8 |
HIP 110792 |
27.34 |
| 2026-05-31 00:00 |
22:26:52.12 |
-08:01:58.8 |
HIP 110792 |
28.70 |
| 2026-05-31 12:00 |
22:27:01.07 |
-08:00:38.5 |
HIP 110792 |
30.21 |
| 2026-06-01 00:00 |
22:27:09.85 |
-07:59:19.1 |
HIP 110792 |
31.84 |
| 2026-06-01 12:00 |
22:27:18.47 |
-07:58:00.4 |
HIP 110792 |
33.56 |
| 2026-06-02 00:00 |
22:27:26.92 |
-07:56:42.6 |
HIP 110792 |
35.35 |