메타데이터
| 항목 |
값 |
| Designation |
C/2012 C2 (Bruenjes) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-03-12T15:24:12.444480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:02Z |
| Obs used |
245 |
| NEO |
- |
| M1 |
16.600 |
| K1 |
37.750 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2012-02-17.0000000 |
| e |
1.00307783 |
| q (au) |
0.802314 |
| a (au) |
-260.675176 |
| i (deg) |
162.789231 |
| Ω (om, deg) |
117.996689 |
| ω (w, deg) |
62.658603 |
| M (ma, deg) |
-0.005771 |
밝기
산란 + 전체 선형
$$
M_a = (16.388 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
16.388 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
16:41:02.05 |
-34:07:54.2 |
HIP 81635 |
15.01 |
| 2026-09-20 12:00 |
16:41:03.09 |
-34:07:45.8 |
HIP 81635 |
14.96 |
| 2026-09-21 00:00 |
16:41:04.17 |
-34:07:37.5 |
HIP 81635 |
14.92 |
| 2026-09-21 12:00 |
16:41:05.28 |
-34:07:29.3 |
HIP 81635 |
14.89 |
| 2026-09-22 00:00 |
16:41:06.42 |
-34:07:21.2 |
HIP 81635 |
14.87 |
| 2026-09-22 12:00 |
16:41:07.59 |
-34:07:13.2 |
HIP 81635 |
14.86 |
| 2026-09-23 00:00 |
16:41:08.80 |
-34:07:05.2 |
HIP 81635 |
14.85 |
| 2026-09-23 12:00 |
16:41:10.05 |
-34:06:57.4 |
HIP 81635 |
14.86 |
| 2026-09-24 00:00 |
16:41:11.32 |
-34:06:49.6 |
HIP 81635 |
14.88 |
| 2026-09-24 12:00 |
16:41:12.63 |
-34:06:41.9 |
HIP 81635 |
14.91 |
| 2026-09-25 00:00 |
16:41:13.97 |
-34:06:34.4 |
HIP 81635 |
14.95 |
| 2026-09-25 12:00 |
16:41:15.35 |
-34:06:26.9 |
HIP 81635 |
15.00 |
| 2026-09-26 00:00 |
16:41:16.76 |
-34:06:19.5 |
HIP 81635 |
15.06 |
| 2026-09-26 12:00 |
16:41:18.20 |
-34:06:12.1 |
HIP 81635 |
15.14 |
| 2026-09-27 00:00 |
16:41:19.67 |
-34:06:04.9 |
HIP 81635 |
15.22 |
| 2026-09-27 12:00 |
16:41:21.18 |
-34:05:57.8 |
HIP 81635 |
15.32 |
| 2026-09-28 00:00 |
16:41:22.72 |
-34:05:50.8 |
HIP 81635 |
15.43 |
| 2026-09-28 12:00 |
16:41:24.29 |
-34:05:43.8 |
HIP 81635 |
15.55 |
| 2026-09-29 00:00 |
16:41:25.89 |
-34:05:37.0 |
HIP 81635 |
15.68 |
| 2026-09-29 12:00 |
16:41:27.53 |
-34:05:30.2 |
HIP 81635 |
15.83 |
| 2026-09-30 00:00 |
16:41:29.20 |
-34:05:23.6 |
HIP 81635 |
15.99 |
| 2026-09-30 12:00 |
16:41:30.90 |
-34:05:17.0 |
HIP 81635 |
16.16 |
| 2026-10-01 00:00 |
16:41:32.63 |
-34:05:10.6 |
HIP 81635 |
16.35 |
| 2026-10-01 12:00 |
16:41:34.39 |
-34:05:04.2 |
HIP 81635 |
16.54 |
| 2026-10-02 00:00 |
16:41:36.18 |
-34:04:57.9 |
HIP 81635 |
16.75 |
| 2026-10-02 12:00 |
16:41:38.01 |
-34:04:51.7 |
HIP 81635 |
16.97 |
| 2026-10-03 00:00 |
16:41:39.86 |
-34:04:45.6 |
HIP 81635 |
17.20 |
| 2026-10-03 12:00 |
16:41:41.75 |
-34:04:39.7 |
HIP 81635 |
17.45 |
| 2026-10-04 00:00 |
16:41:43.67 |
-34:04:33.8 |
HIP 81635 |
17.70 |
| 2026-10-04 12:00 |
16:41:45.62 |
-34:04:28.0 |
HIP 81635 |
17.97 |
| 2026-10-05 00:00 |
16:41:47.60 |
-34:04:22.3 |
HIP 81635 |
18.25 |
| 2026-10-05 12:00 |
16:41:49.61 |
-34:04:16.7 |
HIP 81635 |
18.55 |
| 2026-10-06 00:00 |
16:41:51.65 |
-34:04:11.2 |
HIP 81635 |
18.85 |
| 2026-10-06 12:00 |
16:41:53.72 |
-34:04:05.8 |
HIP 81635 |
19.16 |
| 2026-10-07 00:00 |
16:41:55.82 |
-34:04:00.5 |
HIP 81635 |
19.49 |
| 2026-10-07 12:00 |
16:41:57.95 |
-34:03:55.3 |
HIP 81635 |
19.82 |
| 2026-10-08 00:00 |
16:42:00.11 |
-34:03:50.2 |
HIP 81635 |
20.17 |
| 2026-10-08 12:00 |
16:42:02.30 |
-34:03:45.2 |
HIP 81635 |
20.53 |
| 2026-10-09 00:00 |
16:42:04.52 |
-34:03:40.3 |
HIP 81635 |
20.90 |
| 2026-10-09 12:00 |
16:42:06.76 |
-34:03:35.5 |
HIP 81635 |
21.27 |
| 2026-10-10 00:00 |
16:42:09.04 |
-34:03:30.9 |
HIP 81635 |
21.66 |
| 2026-10-10 12:00 |
16:42:11.35 |
-34:03:26.3 |
HIP 81635 |
22.06 |
| 2026-10-11 00:00 |
16:42:13.68 |
-34:03:21.8 |
HIP 81635 |
22.46 |