C/2008 J1 (Boattini)
| 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) |
| 2026-02-03 00:00 |
07:28:33.60 |
-17:21:26.4 |
HIP 36392 |
11.19 |
| 2026-02-03 12:00 |
07:28:30.39 |
-17:21:10.2 |
HIP 36392 |
11.94 |
| 2026-02-04 00:00 |
07:28:27.20 |
-17:20:53.8 |
HIP 36392 |
12.69 |
| 2026-02-04 12:00 |
07:28:24.02 |
-17:20:37.2 |
HIP 36392 |
13.45 |
| 2026-02-05 00:00 |
07:28:20.86 |
-17:20:20.3 |
HIP 36392 |
14.21 |
| 2026-02-05 12:00 |
07:28:17.71 |
-17:20:03.2 |
HIP 36392 |
14.97 |
| 2026-02-06 00:00 |
07:28:14.57 |
-17:19:45.9 |
HIP 36392 |
15.73 |
| 2026-02-06 12:00 |
07:28:11.45 |
-17:19:28.3 |
HIP 36392 |
16.50 |
| 2026-02-07 00:00 |
07:28:08.35 |
-17:19:10.5 |
HIP 36392 |
17.26 |
| 2026-02-07 12:00 |
07:28:05.26 |
-17:18:52.5 |
HIP 36392 |
18.02 |
| 2026-02-08 00:00 |
07:28:02.18 |
-17:18:34.3 |
HIP 36392 |
18.79 |
| 2026-02-08 12:00 |
07:27:59.12 |
-17:18:15.8 |
HIP 36392 |
19.55 |
| 2026-02-09 00:00 |
07:27:56.08 |
-17:17:57.1 |
HIP 36392 |
20.31 |
| 2026-02-09 12:00 |
07:27:53.05 |
-17:17:38.2 |
HIP 36392 |
21.07 |
| 2026-02-10 00:00 |
07:27:50.04 |
-17:17:19.1 |
HIP 36392 |
21.83 |
| 2026-02-10 12:00 |
07:27:47.04 |
-17:16:59.7 |
HIP 36392 |
22.58 |
| 2026-02-11 00:00 |
07:27:44.07 |
-17:16:40.1 |
HIP 36392 |
23.34 |
| 2026-02-11 12:00 |
07:27:41.11 |
-17:16:20.3 |
HIP 36392 |
24.09 |
| 2026-02-12 00:00 |
07:27:38.16 |
-17:16:00.3 |
HIP 36392 |
24.85 |
| 2026-02-12 12:00 |
07:27:35.24 |
-17:15:40.1 |
HIP 36392 |
25.60 |
| 2026-02-13 00:00 |
07:27:32.33 |
-17:15:19.7 |
HIP 36392 |
26.35 |
| 2026-02-13 12:00 |
07:27:29.44 |
-17:14:59.1 |
HIP 36392 |
27.09 |
| 2026-02-14 00:00 |
07:27:26.57 |
-17:14:38.3 |
HIP 36392 |
27.84 |
| 2026-02-14 12:00 |
07:27:23.72 |
-17:14:17.2 |
HIP 36392 |
28.58 |
| 2026-02-15 00:00 |
07:27:20.88 |
-17:13:56.0 |
HIP 36392 |
29.32 |
| 2026-02-15 12:00 |
07:27:18.07 |
-17:13:34.6 |
HIP 36392 |
30.05 |
| 2026-02-16 00:00 |
07:27:15.28 |
-17:13:13.0 |
HIP 36392 |
30.79 |
| 2026-02-16 12:00 |
07:27:12.50 |
-17:12:51.2 |
HIP 36392 |
31.52 |
| 2026-02-17 00:00 |
07:27:09.75 |
-17:12:29.1 |
HIP 36392 |
32.25 |
| 2026-02-17 12:00 |
07:27:07.01 |
-17:12:06.9 |
HIP 36392 |
32.98 |
| 2026-02-18 00:00 |
07:27:04.30 |
-17:11:44.6 |
HIP 36392 |
33.70 |
| 2026-02-18 12:00 |
07:27:01.60 |
-17:11:22.0 |
HIP 36392 |
34.42 |
| 2026-02-19 00:00 |
07:26:58.93 |
-17:10:59.2 |
HIP 36392 |
35.14 |
| 2026-02-19 12:00 |
07:26:56.28 |
-17:10:36.3 |
HIP 36392 |
35.85 |
| 2026-02-20 00:00 |
07:26:53.65 |
-17:10:13.2 |
HIP 36392 |
36.57 |
| 2026-02-20 12:00 |
07:26:51.04 |
-17:09:49.9 |
HIP 36392 |
37.28 |
| 2026-02-21 00:00 |
07:26:48.45 |
-17:09:26.5 |
HIP 36392 |
37.98 |
| 2026-02-21 12:00 |
07:26:45.88 |
-17:09:02.9 |
HIP 36392 |
38.68 |
| 2026-02-22 00:00 |
07:26:43.34 |
-17:08:39.1 |
HIP 36392 |
39.38 |
| 2026-02-22 12:00 |
07:26:40.82 |
-17:08:15.1 |
HIP 36392 |
40.08 |
| 2026-02-23 00:00 |
07:26:38.32 |
-17:07:51.0 |
HIP 36392 |
40.77 |
| 2026-02-23 12:00 |
07:26:35.84 |
-17:07:26.7 |
HIP 36392 |
41.46 |
| 2026-02-24 00:00 |
07:26:33.39 |
-17:07:02.3 |
HIP 35884 |
42.02 |