C/2026 B2 (Sun-Gao)
| Parameter |
Value |
| Designation |
C/2026 B2 (Sun-Gao) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-01-09T18:34:39.302400Z |
| Orbit solution date (soln_date, UTC) |
2026-01-28T16:52:43Z |
| Obs used |
72 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2026-01-19T00:03:36.864000Z |
| Discovery magnitude (MPC) |
15.50 G |
| Discovery observatory (MPC) |
N86 · Xingming Observatory-KATS, Nanshan |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-01-22.0000000 |
| e |
0.96581943 |
| q (au) |
1.277467 |
| a (au) |
37.374055 |
| i (deg) |
59.703197 |
| Ω (om, deg) |
234.615540 |
| ω (w, deg) |
47.000472 |
| M (ma, deg) |
0.052739 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.192 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.192 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.501 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
19:50:58.49 |
+11:35:30.8 |
HIP 97767 |
16.11 |
| 2026-02-03 12:00 |
19:52:51.14 |
+11:50:51.6 |
HIP 97767 |
17.52 |
| 2026-02-04 00:00 |
19:54:43.85 |
+12:06:11.2 |
HIP 98026 |
10.95 |
| 2026-02-04 12:00 |
19:56:36.62 |
+12:21:29.6 |
HIP 98144 |
5.38 |
| 2026-02-05 00:00 |
19:58:29.44 |
+12:36:46.7 |
HIP 98247 |
15.36 |
| 2026-02-05 12:00 |
20:00:22.31 |
+12:52:02.3 |
HIP 98468 |
14.03 |
| 2026-02-06 00:00 |
20:02:15.23 |
+13:07:16.4 |
HIP 98721 |
12.73 |
| 2026-02-06 12:00 |
20:04:08.19 |
+13:22:28.9 |
HIP 98892 |
24.48 |
| 2026-02-07 00:00 |
20:06:01.19 |
+13:37:39.6 |
HIP 98911 |
15.82 |
| 2026-02-07 12:00 |
20:07:54.23 |
+13:52:48.4 |
HIP 99151 |
27.65 |
| 2026-02-08 00:00 |
20:09:47.30 |
+14:07:55.3 |
HIP 99398 |
27.85 |
| 2026-02-08 12:00 |
20:11:40.39 |
+14:23:00.1 |
HIP 99505 |
15.94 |
| 2026-02-09 00:00 |
20:13:33.50 |
+14:38:02.7 |
HIP 99659 |
13.55 |
| 2026-02-09 12:00 |
20:15:26.64 |
+14:53:03.1 |
HIP 99742 |
25.29 |
| 2026-02-10 00:00 |
20:17:19.78 |
+15:08:01.1 |
HIP 100011 |
18.60 |
| 2026-02-10 12:00 |
20:19:12.94 |
+15:22:56.7 |
HIP 100212 |
10.74 |
| 2026-02-11 00:00 |
20:21:06.10 |
+15:37:49.7 |
HIP 100269 |
13.31 |
| 2026-02-11 12:00 |
20:22:59.27 |
+15:52:40.0 |
HIP 100598 |
16.71 |
| 2026-02-12 00:00 |
20:24:52.43 |
+16:07:27.6 |
HIP 100658 |
4.18 |
| 2026-02-12 12:00 |
20:26:45.58 |
+16:22:12.4 |
HIP 100880 |
21.69 |
| 2026-02-13 00:00 |
20:28:38.71 |
+16:36:54.2 |
HIP 100880 |
20.71 |
| 2026-02-13 12:00 |
20:30:31.84 |
+16:51:33.1 |
HIP 101219 |
14.91 |
| 2026-02-14 00:00 |
20:32:24.94 |
+17:06:08.8 |
HIP 101290 |
10.26 |
| 2026-02-14 12:00 |
20:34:18.01 |
+17:20:41.3 |
HIP 101675 |
34.82 |
| 2026-02-15 00:00 |
20:36:11.05 |
+17:35:10.5 |
HIP 101675 |
26.92 |
| 2026-02-15 12:00 |
20:38:04.06 |
+17:49:36.4 |
HIP 101810 |
26.59 |
| 2026-02-16 00:00 |
20:39:57.03 |
+18:03:58.8 |
HIP 102076 |
19.65 |
| 2026-02-16 12:00 |
20:41:49.95 |
+18:18:17.7 |
HIP 102076 |
10.85 |
| 2026-02-17 00:00 |
20:43:42.83 |
+18:32:33.0 |
HIP 102456 |
28.15 |
| 2026-02-17 12:00 |
20:45:35.65 |
+18:46:44.6 |
HIP 102456 |
12.22 |
| 2026-02-18 00:00 |
20:47:28.41 |
+19:00:52.4 |
HIP 102539 |
10.17 |
| 2026-02-18 12:00 |
20:49:21.11 |
+19:14:56.4 |
HIP 102886 |
19.86 |
| 2026-02-19 00:00 |
20:51:13.74 |
+19:28:56.4 |
HIP 102886 |
10.59 |
| 2026-02-19 12:00 |
20:53:06.30 |
+19:42:52.5 |
HIP 103121 |
10.57 |
| 2026-02-20 00:00 |
20:54:58.78 |
+19:56:44.5 |
HIP 103172 |
16.16 |
| 2026-02-20 12:00 |
20:56:51.18 |
+20:10:32.4 |
HIP 103288 |
22.76 |
| 2026-02-21 00:00 |
20:58:43.50 |
+20:24:16.1 |
HIP 103558 |
21.35 |
| 2026-02-21 12:00 |
21:00:35.72 |
+20:37:55.5 |
HIP 103727 |
7.61 |
| 2026-02-22 00:00 |
21:02:27.85 |
+20:51:30.6 |
HIP 103817 |
14.37 |
| 2026-02-22 12:00 |
21:04:19.88 |
+21:05:01.3 |
HIP 104135 |
23.78 |
| 2026-02-23 00:00 |
21:06:11.80 |
+21:18:27.5 |
HIP 104134 |
3.86 |
| 2026-02-23 12:00 |
21:08:03.62 |
+21:31:49.3 |
HIP 104327 |
14.07 |
| 2026-02-24 00:00 |
21:09:55.32 |
+21:45:06.5 |
HIP 104474 |
10.86 |