| 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) |
| 2026-03-26 00:00 |
15:55:39.91 |
-05:52:53.5 |
HIP 77864 |
27.02 |
| 2026-03-26 12:00 |
15:55:37.07 |
-05:52:29.8 |
HIP 77864 |
26.22 |
| 2026-03-27 00:00 |
15:55:34.19 |
-05:52:06.2 |
HIP 77864 |
25.42 |
| 2026-03-27 12:00 |
15:55:31.26 |
-05:51:42.5 |
HIP 77864 |
24.60 |
| 2026-03-28 00:00 |
15:55:28.28 |
-05:51:18.8 |
HIP 77864 |
23.77 |
| 2026-03-28 12:00 |
15:55:25.26 |
-05:50:55.0 |
HIP 77864 |
22.93 |
| 2026-03-29 00:00 |
15:55:22.19 |
-05:50:31.3 |
HIP 77864 |
22.09 |
| 2026-03-29 12:00 |
15:55:19.08 |
-05:50:07.5 |
HIP 77864 |
21.23 |
| 2026-03-30 00:00 |
15:55:15.92 |
-05:49:43.7 |
HIP 77864 |
20.36 |
| 2026-03-30 12:00 |
15:55:12.71 |
-05:49:19.8 |
HIP 77864 |
19.49 |
| 2026-03-31 00:00 |
15:55:09.47 |
-05:48:56.0 |
HIP 77864 |
18.60 |
| 2026-03-31 12:00 |
15:55:06.17 |
-05:48:32.1 |
HIP 77864 |
17.71 |
| 2026-04-01 00:00 |
15:55:02.84 |
-05:48:08.3 |
HIP 77864 |
16.80 |
| 2026-04-01 12:00 |
15:54:59.46 |
-05:47:44.4 |
HIP 77864 |
15.89 |
| 2026-04-02 00:00 |
15:54:56.03 |
-05:47:20.5 |
HIP 77864 |
14.97 |
| 2026-04-02 12:00 |
15:54:52.56 |
-05:46:56.6 |
HIP 77864 |
14.04 |
| 2026-04-03 00:00 |
15:54:49.05 |
-05:46:32.7 |
HIP 77864 |
13.10 |
| 2026-04-03 12:00 |
15:54:45.50 |
-05:46:08.8 |
HIP 77864 |
12.16 |
| 2026-04-04 00:00 |
15:54:41.91 |
-05:45:44.9 |
HIP 77864 |
11.21 |
| 2026-04-04 12:00 |
15:54:38.27 |
-05:45:21.1 |
HIP 77864 |
10.25 |
| 2026-04-05 00:00 |
15:54:34.59 |
-05:44:57.2 |
HIP 77864 |
9.30 |
| 2026-04-05 12:00 |
15:54:30.87 |
-05:44:33.3 |
HIP 77864 |
8.34 |
| 2026-04-06 00:00 |
15:54:27.11 |
-05:44:09.5 |
HIP 77864 |
7.38 |
| 2026-04-06 12:00 |
15:54:23.30 |
-05:43:45.6 |
HIP 77864 |
6.43 |
| 2026-04-07 00:00 |
15:54:19.46 |
-05:43:21.8 |
HIP 77864 |
5.50 |
| 2026-04-07 12:00 |
15:54:15.58 |
-05:42:58.0 |
HIP 77864 |
4.61 |
| 2026-04-08 00:00 |
15:54:11.65 |
-05:42:34.2 |
HIP 77864 |
3.78 |
| 2026-04-08 12:00 |
15:54:07.69 |
-05:42:10.5 |
HIP 77864 |
3.08 |
| 2026-04-09 00:00 |
15:54:03.69 |
-05:41:46.7 |
HIP 77864 |
2.64 |
| 2026-04-09 12:00 |
15:53:59.65 |
-05:41:23.0 |
HIP 77864 |
2.59 |
| 2026-04-10 00:00 |
15:53:55.57 |
-05:40:59.4 |
HIP 77864 |
2.96 |
| 2026-04-10 12:00 |
15:53:51.45 |
-05:40:35.7 |
HIP 77864 |
3.64 |
| 2026-04-11 00:00 |
15:53:47.30 |
-05:40:12.1 |
HIP 77864 |
4.49 |
| 2026-04-11 12:00 |
15:53:43.10 |
-05:39:48.6 |
HIP 77864 |
5.44 |
| 2026-04-12 00:00 |
15:53:38.87 |
-05:39:25.0 |
HIP 77864 |
6.45 |
| 2026-04-12 12:00 |
15:53:34.61 |
-05:39:01.6 |
HIP 77864 |
7.50 |
| 2026-04-13 00:00 |
15:53:30.31 |
-05:38:38.1 |
HIP 77864 |
8.57 |
| 2026-04-13 12:00 |
15:53:25.97 |
-05:38:14.7 |
HIP 77864 |
9.67 |
| 2026-04-14 00:00 |
15:53:21.59 |
-05:37:51.4 |
HIP 77768 |
9.73 |
| 2026-04-14 12:00 |
15:53:17.18 |
-05:37:28.1 |
HIP 77768 |
8.88 |
| 2026-04-15 00:00 |
15:53:12.74 |
-05:37:04.9 |
HIP 77768 |
8.11 |
| 2026-04-15 12:00 |
15:53:08.26 |
-05:36:41.8 |
HIP 77768 |
7.44 |
| 2026-04-16 00:00 |
15:53:03.75 |
-05:36:18.7 |
HIP 77768 |
6.90 |