| 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) |
| 2026-06-01 00:00 |
07:27:10.61 |
-15:46:43.5 |
HIP 36121 |
10.62 |
| 2026-06-01 12:00 |
07:27:13.21 |
-15:46:31.2 |
HIP 36121 |
11.23 |
| 2026-06-02 00:00 |
07:27:15.83 |
-15:46:19.2 |
HIP 36121 |
11.86 |
| 2026-06-02 12:00 |
07:27:18.46 |
-15:46:07.4 |
HIP 36121 |
12.49 |
| 2026-06-03 00:00 |
07:27:21.11 |
-15:45:55.8 |
HIP 36121 |
13.13 |
| 2026-06-03 12:00 |
07:27:23.77 |
-15:45:44.4 |
HIP 36121 |
13.78 |
| 2026-06-04 00:00 |
07:27:26.45 |
-15:45:33.3 |
HIP 36121 |
14.43 |
| 2026-06-04 12:00 |
07:27:29.15 |
-15:45:22.4 |
HIP 36121 |
15.09 |
| 2026-06-05 00:00 |
07:27:31.86 |
-15:45:11.7 |
HIP 36121 |
15.75 |
| 2026-06-05 12:00 |
07:27:34.59 |
-15:45:01.3 |
HIP 36121 |
16.42 |
| 2026-06-06 00:00 |
07:27:37.33 |
-15:44:51.1 |
HIP 36121 |
17.09 |
| 2026-06-06 12:00 |
07:27:40.09 |
-15:44:41.1 |
HIP 36121 |
17.76 |
| 2026-06-07 00:00 |
07:27:42.87 |
-15:44:31.3 |
HIP 36121 |
18.44 |
| 2026-06-07 12:00 |
07:27:45.65 |
-15:44:21.8 |
HIP 36121 |
19.13 |
| 2026-06-08 00:00 |
07:27:48.46 |
-15:44:12.5 |
HIP 36121 |
19.81 |
| 2026-06-08 12:00 |
07:27:51.27 |
-15:44:03.4 |
HIP 36121 |
20.50 |
| 2026-06-09 00:00 |
07:27:54.11 |
-15:43:54.6 |
HIP 36121 |
21.20 |
| 2026-06-09 12:00 |
07:27:56.95 |
-15:43:46.0 |
HIP 36121 |
21.89 |
| 2026-06-10 00:00 |
07:27:59.81 |
-15:43:37.7 |
HIP 36250 |
22.11 |
| 2026-06-10 12:00 |
07:28:02.68 |
-15:43:29.6 |
HIP 36250 |
22.32 |
| 2026-06-11 00:00 |
07:28:05.57 |
-15:43:21.7 |
HIP 36250 |
22.55 |
| 2026-06-11 12:00 |
07:28:08.47 |
-15:43:14.0 |
HIP 36250 |
22.79 |
| 2026-06-12 00:00 |
07:28:11.38 |
-15:43:06.6 |
HIP 36250 |
23.05 |
| 2026-06-12 12:00 |
07:28:14.31 |
-15:42:59.5 |
HIP 36250 |
23.32 |
| 2026-06-13 00:00 |
07:28:17.25 |
-15:42:52.5 |
HIP 36250 |
23.62 |
| 2026-06-13 12:00 |
07:28:20.20 |
-15:42:45.9 |
HIP 36250 |
23.92 |
| 2026-06-14 00:00 |
07:28:23.16 |
-15:42:39.4 |
HIP 36250 |
24.24 |
| 2026-06-14 12:00 |
07:28:26.13 |
-15:42:33.2 |
HIP 36250 |
24.58 |
| 2026-06-15 00:00 |
07:28:29.12 |
-15:42:27.3 |
HIP 36250 |
24.92 |
| 2026-06-15 12:00 |
07:28:32.12 |
-15:42:21.5 |
HIP 36250 |
25.29 |
| 2026-06-16 00:00 |
07:28:35.13 |
-15:42:16.1 |
HIP 36250 |
25.66 |
| 2026-06-16 12:00 |
07:28:38.15 |
-15:42:10.8 |
HIP 36472 |
25.63 |
| 2026-06-17 00:00 |
07:28:41.18 |
-15:42:05.9 |
HIP 36472 |
24.98 |
| 2026-06-17 12:00 |
07:28:44.23 |
-15:42:01.1 |
HIP 36472 |
24.33 |
| 2026-06-18 00:00 |
07:28:47.28 |
-15:41:56.6 |
HIP 36472 |
23.67 |
| 2026-06-18 12:00 |
07:28:50.34 |
-15:41:52.4 |
HIP 36472 |
23.02 |
| 2026-06-19 00:00 |
07:28:53.42 |
-15:41:48.3 |
HIP 36472 |
22.37 |
| 2026-06-19 12:00 |
07:28:56.50 |
-15:41:44.6 |
HIP 36472 |
21.72 |
| 2026-06-20 00:00 |
07:28:59.59 |
-15:41:41.1 |
HIP 36472 |
21.08 |
| 2026-06-20 12:00 |
07:29:02.70 |
-15:41:37.8 |
HIP 36472 |
20.44 |
| 2026-06-21 00:00 |
07:29:05.81 |
-15:41:34.8 |
HIP 36472 |
19.80 |
| 2026-06-21 12:00 |
07:29:08.93 |
-15:41:32.0 |
HIP 36472 |
19.16 |
| 2026-06-22 00:00 |
07:29:12.06 |
-15:41:29.4 |
HIP 36472 |
18.53 |