| Parameter |
Value |
| Designation |
C/2010 U3 (Boattini) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-02-26T02:57:05.869440Z |
| Orbit solution date (soln_date, UTC) |
2023-05-10T17:42:22Z |
| Obs used |
4354 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
6.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-06-18.0000000 |
| e |
1.00085475 |
| q (au) |
8.445819 |
| a (au) |
-9881.022043 |
| i (deg) |
55.512084 |
| Ω (om, deg) |
43.072839 |
| ω (w, deg) |
88.065133 |
| M (ma, deg) |
-0.000620 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.728 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.728 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.962 |
| k |
0.800 |
| δ90 |
9.998 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2005-11-05 |
2010-11-28 |
+3.2013 |
-4.882 |
| 2010-11-28 |
2014-12-20 |
-9.5815 |
+10.967 |
| 2014-12-20 |
2016-01-14 |
-1.5209 |
+2.101 |
| 2016-01-14 |
2017-01-27 |
-14.7858 |
+15.392 |
| 2017-01-27 |
2019-02-26 |
+8.0172 |
-7.205 |
| 2019-02-26 |
2021-03-05 |
+65.7270 |
-61.376 |
| 2021-03-05 |
2022-12-25 |
-18.5573 |
+20.893 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
14:32:00.75 |
-14:12:23.0 |
HIP 71189 |
23.95 |
| 2026-09-20 12:00 |
14:32:06.01 |
-14:13:09.6 |
HIP 71189 |
23.02 |
| 2026-09-21 00:00 |
14:32:11.31 |
-14:13:56.4 |
HIP 71189 |
22.15 |
| 2026-09-21 12:00 |
14:32:16.64 |
-14:14:43.3 |
HIP 71189 |
21.35 |
| 2026-09-22 00:00 |
14:32:22.01 |
-14:15:30.4 |
HIP 71189 |
20.62 |
| 2026-09-22 12:00 |
14:32:27.41 |
-14:16:17.5 |
HIP 71189 |
19.97 |
| 2026-09-23 00:00 |
14:32:32.84 |
-14:17:04.8 |
HIP 71189 |
19.41 |
| 2026-09-23 12:00 |
14:32:38.30 |
-14:17:52.2 |
HIP 71189 |
18.96 |
| 2026-09-24 00:00 |
14:32:43.79 |
-14:18:39.7 |
HIP 71189 |
18.63 |
| 2026-09-24 12:00 |
14:32:49.32 |
-14:19:27.3 |
HIP 71189 |
18.41 |
| 2026-09-25 00:00 |
14:32:54.87 |
-14:20:15.0 |
HIP 71189 |
18.33 |
| 2026-09-25 12:00 |
14:33:00.46 |
-14:21:02.8 |
HIP 71189 |
18.37 |
| 2026-09-26 00:00 |
14:33:06.07 |
-14:21:50.8 |
HIP 71189 |
18.55 |
| 2026-09-26 12:00 |
14:33:11.72 |
-14:22:38.8 |
HIP 71189 |
18.86 |
| 2026-09-27 00:00 |
14:33:17.40 |
-14:23:27.0 |
HIP 71189 |
19.29 |
| 2026-09-27 12:00 |
14:33:23.10 |
-14:24:15.2 |
HIP 71189 |
19.84 |
| 2026-09-28 00:00 |
14:33:28.84 |
-14:25:03.6 |
HIP 71189 |
20.51 |
| 2026-09-28 12:00 |
14:33:34.60 |
-14:25:52.1 |
HIP 71189 |
21.28 |
| 2026-09-29 00:00 |
14:33:40.39 |
-14:26:40.6 |
HIP 71189 |
22.14 |
| 2026-09-29 12:00 |
14:33:46.21 |
-14:27:29.3 |
HIP 71189 |
23.08 |
| 2026-09-30 00:00 |
14:33:52.06 |
-14:28:18.0 |
HIP 71189 |
24.10 |
| 2026-09-30 12:00 |
14:33:57.93 |
-14:29:06.9 |
HIP 71299 |
23.28 |
| 2026-10-01 00:00 |
14:34:03.84 |
-14:29:55.8 |
HIP 71299 |
21.81 |
| 2026-10-01 12:00 |
14:34:09.77 |
-14:30:44.9 |
HIP 71299 |
20.35 |
| 2026-10-02 00:00 |
14:34:15.72 |
-14:31:34.0 |
HIP 71299 |
18.93 |
| 2026-10-02 12:00 |
14:34:21.70 |
-14:32:23.2 |
HIP 71299 |
17.54 |
| 2026-10-03 00:00 |
14:34:27.71 |
-14:33:12.6 |
HIP 71299 |
16.20 |
| 2026-10-03 12:00 |
14:34:33.75 |
-14:34:02.0 |
HIP 71299 |
14.92 |
| 2026-10-04 00:00 |
14:34:39.81 |
-14:34:51.4 |
HIP 71299 |
13.73 |
| 2026-10-04 12:00 |
14:34:45.89 |
-14:35:41.0 |
HIP 71299 |
12.65 |
| 2026-10-05 00:00 |
14:34:52.00 |
-14:36:30.7 |
HIP 71299 |
11.70 |
| 2026-10-05 12:00 |
14:34:58.13 |
-14:37:20.4 |
HIP 71299 |
10.94 |
| 2026-10-06 00:00 |
14:35:04.29 |
-14:38:10.2 |
HIP 71299 |
10.41 |
| 2026-10-06 12:00 |
14:35:10.47 |
-14:39:00.1 |
HIP 71299 |
10.14 |
| 2026-10-07 00:00 |
14:35:16.67 |
-14:39:50.0 |
HIP 71299 |
10.15 |
| 2026-10-07 12:00 |
14:35:22.90 |
-14:40:40.1 |
HIP 71299 |
10.45 |
| 2026-10-08 00:00 |
14:35:29.15 |
-14:41:30.2 |
HIP 71299 |
11.02 |
| 2026-10-08 12:00 |
14:35:35.42 |
-14:42:20.4 |
HIP 71299 |
11.82 |
| 2026-10-09 00:00 |
14:35:41.71 |
-14:43:10.6 |
HIP 71299 |
12.81 |
| 2026-10-09 12:00 |
14:35:48.02 |
-14:44:00.9 |
HIP 71299 |
13.95 |
| 2026-10-10 00:00 |
14:35:54.36 |
-14:44:51.3 |
HIP 71299 |
15.21 |
| 2026-10-10 12:00 |
14:36:00.71 |
-14:45:41.7 |
HIP 71299 |
16.57 |
| 2026-10-11 00:00 |
14:36:07.09 |
-14:46:32.2 |
HIP 71299 |
17.99 |