| Parameter |
Value |
| Designation |
C/2008 J1 (Boattini) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-07-13T06:16:45.272640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:19Z |
| Obs used |
1557 |
| NEO |
- |
| M1 |
8.700 |
| K1 |
17.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2008-08-03.0000000 |
| e |
0.98961635 |
| q (au) |
1.724294 |
| a (au) |
166.058556 |
| i (deg) |
61.780021 |
| Ω (om, deg) |
273.419698 |
| ω (w, deg) |
68.122712 |
| M (ma, deg) |
0.009552 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.102 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.102 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.525 |
| k |
0.800 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2008-05-02 |
2008-07-13 |
+2.4126 |
-0.690 |
| 2008-07-13 |
2009-04-04 |
+6.1030 |
-2.669 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
07:24:53.15 |
-16:39:18.2 |
HIP 36016 |
13.30 |
| 2026-03-26 12:00 |
07:24:52.34 |
-16:38:48.8 |
HIP 36016 |
12.96 |
| 2026-03-27 00:00 |
07:24:51.55 |
-16:38:19.3 |
HIP 36016 |
12.64 |
| 2026-03-27 12:00 |
07:24:50.79 |
-16:37:49.8 |
HIP 36016 |
12.32 |
| 2026-03-28 00:00 |
07:24:50.07 |
-16:37:20.3 |
HIP 36016 |
12.01 |
| 2026-03-28 12:00 |
07:24:49.37 |
-16:36:50.9 |
HIP 36016 |
11.71 |
| 2026-03-29 00:00 |
07:24:48.70 |
-16:36:21.4 |
HIP 36016 |
11.43 |
| 2026-03-29 12:00 |
07:24:48.06 |
-16:35:51.9 |
HIP 36016 |
11.16 |
| 2026-03-30 00:00 |
07:24:47.45 |
-16:35:22.5 |
HIP 36016 |
10.90 |
| 2026-03-30 12:00 |
07:24:46.87 |
-16:34:53.0 |
HIP 36016 |
10.65 |
| 2026-03-31 00:00 |
07:24:46.32 |
-16:34:23.6 |
HIP 36016 |
10.42 |
| 2026-03-31 12:00 |
07:24:45.80 |
-16:33:54.2 |
HIP 36016 |
10.20 |
| 2026-04-01 00:00 |
07:24:45.31 |
-16:33:24.8 |
HIP 36016 |
10.00 |
| 2026-04-01 12:00 |
07:24:44.84 |
-16:32:55.5 |
HIP 36016 |
9.81 |
| 2026-04-02 00:00 |
07:24:44.41 |
-16:32:26.1 |
HIP 36016 |
9.64 |
| 2026-04-02 12:00 |
07:24:44.01 |
-16:31:56.8 |
HIP 36016 |
9.49 |
| 2026-04-03 00:00 |
07:24:43.63 |
-16:31:27.5 |
HIP 36016 |
9.35 |
| 2026-04-03 12:00 |
07:24:43.29 |
-16:30:58.3 |
HIP 36016 |
9.24 |
| 2026-04-04 00:00 |
07:24:42.97 |
-16:30:29.1 |
HIP 36016 |
9.14 |
| 2026-04-04 12:00 |
07:24:42.69 |
-16:29:59.9 |
HIP 36016 |
9.06 |
| 2026-04-05 00:00 |
07:24:42.43 |
-16:29:30.7 |
HIP 36016 |
9.00 |
| 2026-04-05 12:00 |
07:24:42.21 |
-16:29:01.6 |
HIP 36016 |
8.96 |
| 2026-04-06 00:00 |
07:24:42.01 |
-16:28:32.5 |
HIP 36016 |
8.94 |
| 2026-04-06 12:00 |
07:24:41.84 |
-16:28:03.5 |
HIP 36016 |
8.94 |
| 2026-04-07 00:00 |
07:24:41.70 |
-16:27:34.5 |
HIP 36016 |
8.96 |
| 2026-04-07 12:00 |
07:24:41.59 |
-16:27:05.6 |
HIP 36016 |
9.00 |
| 2026-04-08 00:00 |
07:24:41.52 |
-16:26:36.7 |
HIP 36016 |
9.05 |
| 2026-04-08 12:00 |
07:24:41.47 |
-16:26:07.9 |
HIP 36016 |
9.13 |
| 2026-04-09 00:00 |
07:24:41.45 |
-16:25:39.1 |
HIP 36016 |
9.22 |
| 2026-04-09 12:00 |
07:24:41.45 |
-16:25:10.4 |
HIP 36016 |
9.32 |
| 2026-04-10 00:00 |
07:24:41.49 |
-16:24:41.7 |
HIP 36016 |
9.45 |
| 2026-04-10 12:00 |
07:24:41.56 |
-16:24:13.1 |
HIP 36016 |
9.59 |
| 2026-04-11 00:00 |
07:24:41.66 |
-16:23:44.6 |
HIP 36016 |
9.74 |
| 2026-04-11 12:00 |
07:24:41.78 |
-16:23:16.1 |
HIP 36016 |
9.91 |
| 2026-04-12 00:00 |
07:24:41.94 |
-16:22:47.7 |
HIP 36016 |
10.09 |
| 2026-04-12 12:00 |
07:24:42.12 |
-16:22:19.4 |
HIP 35951 |
10.25 |
| 2026-04-13 00:00 |
07:24:42.34 |
-16:21:51.1 |
HIP 35951 |
9.78 |
| 2026-04-13 12:00 |
07:24:42.58 |
-16:21:22.9 |
HIP 35951 |
9.31 |
| 2026-04-14 00:00 |
07:24:42.85 |
-16:20:54.8 |
HIP 35951 |
8.85 |
| 2026-04-14 12:00 |
07:24:43.16 |
-16:20:26.8 |
HIP 35951 |
8.39 |
| 2026-04-15 00:00 |
07:24:43.49 |
-16:19:58.9 |
HIP 35951 |
7.94 |
| 2026-04-15 12:00 |
07:24:43.85 |
-16:19:31.0 |
HIP 35951 |
7.48 |
| 2026-04-16 00:00 |
07:24:44.24 |
-16:19:03.2 |
HIP 35951 |
7.04 |