| Parameter |
Value |
| Designation |
C/2011 Y3 (Boattini) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-08-22T22:31:41.001600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:59Z |
| Obs used |
54 |
| NEO |
- |
| M1 |
11.700 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-01-01.0000000 |
| e |
0.70491483 |
| q (au) |
3.497843 |
| a (au) |
11.853673 |
| i (deg) |
26.516854 |
| Ω (om, deg) |
84.802605 |
| ω (w, deg) |
340.679907 |
| M (ma, deg) |
3.165186 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.131 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.131 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.952 |
| k |
1.000 |
| δ90 |
10.000 |
| 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) |
| 2026-05-12 00:00 |
15:48:34.19 |
-05:18:43.0 |
HIP 77344 |
21.30 |
| 2026-05-12 12:00 |
15:48:28.56 |
-05:18:26.5 |
HIP 77344 |
19.98 |
| 2026-05-13 00:00 |
15:48:22.93 |
-05:18:10.2 |
HIP 77344 |
18.68 |
| 2026-05-13 12:00 |
15:48:17.28 |
-05:17:54.1 |
HIP 77344 |
17.39 |
| 2026-05-14 00:00 |
15:48:11.63 |
-05:17:38.2 |
HIP 77344 |
16.14 |
| 2026-05-14 12:00 |
15:48:05.98 |
-05:17:22.4 |
HIP 77344 |
14.92 |
| 2026-05-15 00:00 |
15:48:00.32 |
-05:17:06.9 |
HIP 77344 |
13.74 |
| 2026-05-15 12:00 |
15:47:54.65 |
-05:16:51.5 |
HIP 77344 |
12.61 |
| 2026-05-16 00:00 |
15:47:48.98 |
-05:16:36.3 |
HIP 77344 |
11.55 |
| 2026-05-16 12:00 |
15:47:43.30 |
-05:16:21.3 |
HIP 77344 |
10.59 |
| 2026-05-17 00:00 |
15:47:37.63 |
-05:16:06.6 |
HIP 77344 |
9.74 |
| 2026-05-17 12:00 |
15:47:31.95 |
-05:15:52.0 |
HIP 77344 |
9.05 |
| 2026-05-18 00:00 |
15:47:26.26 |
-05:15:37.6 |
HIP 77344 |
8.55 |
| 2026-05-18 12:00 |
15:47:20.58 |
-05:15:23.4 |
HIP 77293 |
7.40 |
| 2026-05-19 00:00 |
15:47:14.89 |
-05:15:09.4 |
HIP 77293 |
5.98 |
| 2026-05-19 12:00 |
15:47:09.20 |
-05:14:55.7 |
HIP 77293 |
4.59 |
| 2026-05-20 00:00 |
15:47:03.52 |
-05:14:42.1 |
HIP 77293 |
3.22 |
| 2026-05-20 12:00 |
15:46:57.83 |
-05:14:28.8 |
HIP 77293 |
1.96 |
| 2026-05-21 00:00 |
15:46:52.14 |
-05:14:15.6 |
HIP 77293 |
1.18 |
| 2026-05-21 12:00 |
15:46:46.46 |
-05:14:02.7 |
HIP 77293 |
1.74 |
| 2026-05-22 00:00 |
15:46:40.78 |
-05:13:50.0 |
HIP 77293 |
2.96 |
| 2026-05-22 12:00 |
15:46:35.10 |
-05:13:37.5 |
HIP 77293 |
4.31 |
| 2026-05-23 00:00 |
15:46:29.42 |
-05:13:25.2 |
HIP 77293 |
5.69 |
| 2026-05-23 12:00 |
15:46:23.75 |
-05:13:13.1 |
HIP 77293 |
7.09 |
| 2026-05-24 00:00 |
15:46:18.08 |
-05:13:01.3 |
HIP 77293 |
8.50 |
| 2026-05-24 12:00 |
15:46:12.42 |
-05:12:49.6 |
HIP 77293 |
9.91 |
| 2026-05-25 00:00 |
15:46:06.76 |
-05:12:38.2 |
HIP 77293 |
11.32 |
| 2026-05-25 12:00 |
15:46:01.11 |
-05:12:27.0 |
HIP 77293 |
12.73 |
| 2026-05-26 00:00 |
15:45:55.46 |
-05:12:16.1 |
HIP 77293 |
14.14 |
| 2026-05-26 12:00 |
15:45:49.82 |
-05:12:05.3 |
HIP 77133 |
13.82 |
| 2026-05-27 00:00 |
15:45:44.19 |
-05:11:54.8 |
HIP 77133 |
12.43 |
| 2026-05-27 12:00 |
15:45:38.57 |
-05:11:44.5 |
HIP 77133 |
11.06 |
| 2026-05-28 00:00 |
15:45:32.95 |
-05:11:34.5 |
HIP 77133 |
9.70 |
| 2026-05-28 12:00 |
15:45:27.35 |
-05:11:24.7 |
HIP 77133 |
8.36 |
| 2026-05-29 00:00 |
15:45:21.75 |
-05:11:15.1 |
HIP 77133 |
7.05 |
| 2026-05-29 12:00 |
15:45:16.16 |
-05:11:05.7 |
HIP 77133 |
5.78 |
| 2026-05-30 00:00 |
15:45:10.58 |
-05:10:56.5 |
HIP 77133 |
4.60 |
| 2026-05-30 12:00 |
15:45:05.01 |
-05:10:47.6 |
HIP 77133 |
3.59 |
| 2026-05-31 00:00 |
15:44:59.46 |
-05:10:39.0 |
HIP 77133 |
2.91 |
| 2026-05-31 12:00 |
15:44:53.91 |
-05:10:30.5 |
HIP 77133 |
2.83 |
| 2026-06-01 00:00 |
15:44:48.38 |
-05:10:22.3 |
HIP 77133 |
3.37 |
| 2026-06-01 12:00 |
15:44:42.86 |
-05:10:14.4 |
HIP 77133 |
4.30 |
| 2026-06-02 00:00 |
15:44:37.35 |
-05:10:06.7 |
HIP 77133 |
5.43 |