메타데이터
| 항목 |
값 |
| Designation |
C/2012 BJ98 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-09-20T10:27:43.799040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:00Z |
| Obs used |
155 |
| NEO |
- |
| M1 |
8.000 |
| K1 |
19.250 |
| PC |
0.030 |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2012-04-10.0000000 |
| e |
0.87364959 |
| q (au) |
2.156578 |
| a (au) |
17.068229 |
| i (deg) |
2.636892 |
| Ω (om, deg) |
124.031746 |
| ω (w, deg) |
72.969830 |
| M (ma, deg) |
357.715617 |
밝기
산란 + 전체 선형
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-06-01 00:00 |
00:05:20.69 |
-01:43:05.7 |
HIP 438 |
4.59 |
| 2026-06-01 12:00 |
00:05:22.71 |
-01:42:55.5 |
HIP 438 |
4.84 |
| 2026-06-02 00:00 |
00:05:24.70 |
-01:42:45.6 |
HIP 438 |
5.13 |
| 2026-06-02 12:00 |
00:05:26.65 |
-01:42:35.8 |
HIP 438 |
5.45 |
| 2026-06-03 00:00 |
00:05:28.57 |
-01:42:26.3 |
HIP 438 |
5.79 |
| 2026-06-03 12:00 |
00:05:30.46 |
-01:42:17.0 |
HIP 438 |
6.15 |
| 2026-06-04 00:00 |
00:05:32.31 |
-01:42:08.0 |
HIP 438 |
6.51 |
| 2026-06-04 12:00 |
00:05:34.12 |
-01:41:59.2 |
HIP 438 |
6.88 |
| 2026-06-05 00:00 |
00:05:35.90 |
-01:41:50.6 |
HIP 438 |
7.26 |
| 2026-06-05 12:00 |
00:05:37.64 |
-01:41:42.3 |
HIP 438 |
7.64 |
| 2026-06-06 00:00 |
00:05:39.35 |
-01:41:34.2 |
HIP 438 |
8.01 |
| 2026-06-06 12:00 |
00:05:41.02 |
-01:41:26.4 |
HIP 438 |
8.39 |
| 2026-06-07 00:00 |
00:05:42.66 |
-01:41:18.8 |
HIP 438 |
8.76 |
| 2026-06-07 12:00 |
00:05:44.26 |
-01:41:11.4 |
HIP 438 |
9.13 |
| 2026-06-08 00:00 |
00:05:45.82 |
-01:41:04.3 |
HIP 438 |
9.49 |
| 2026-06-08 12:00 |
00:05:47.35 |
-01:40:57.4 |
HIP 438 |
9.85 |
| 2026-06-09 00:00 |
00:05:48.85 |
-01:40:50.8 |
HIP 438 |
10.20 |
| 2026-06-09 12:00 |
00:05:50.30 |
-01:40:44.4 |
HIP 438 |
10.54 |
| 2026-06-10 00:00 |
00:05:51.72 |
-01:40:38.2 |
HIP 438 |
10.88 |
| 2026-06-10 12:00 |
00:05:53.11 |
-01:40:32.3 |
HIP 438 |
11.20 |
| 2026-06-11 00:00 |
00:05:54.46 |
-01:40:26.6 |
HIP 438 |
11.53 |
| 2026-06-11 12:00 |
00:05:55.77 |
-01:40:21.2 |
HIP 438 |
11.84 |
| 2026-06-12 00:00 |
00:05:57.04 |
-01:40:16.1 |
HIP 438 |
12.14 |
| 2026-06-12 12:00 |
00:05:58.28 |
-01:40:11.1 |
HIP 438 |
12.44 |
| 2026-06-13 00:00 |
00:05:59.48 |
-01:40:06.5 |
HIP 438 |
12.73 |
| 2026-06-13 12:00 |
00:06:00.64 |
-01:40:02.0 |
HIP 438 |
13.00 |
| 2026-06-14 00:00 |
00:06:01.76 |
-01:39:57.9 |
HIP 438 |
13.27 |
| 2026-06-14 12:00 |
00:06:02.85 |
-01:39:53.9 |
HIP 438 |
13.53 |
| 2026-06-15 00:00 |
00:06:03.90 |
-01:39:50.2 |
HIP 515 |
13.58 |
| 2026-06-15 12:00 |
00:06:04.92 |
-01:39:46.8 |
HIP 515 |
13.60 |
| 2026-06-16 00:00 |
00:06:05.89 |
-01:39:43.6 |
HIP 515 |
13.62 |
| 2026-06-16 12:00 |
00:06:06.83 |
-01:39:40.7 |
HIP 515 |
13.64 |
| 2026-06-17 00:00 |
00:06:07.73 |
-01:39:38.0 |
HIP 515 |
13.66 |
| 2026-06-17 12:00 |
00:06:08.59 |
-01:39:35.6 |
HIP 515 |
13.68 |
| 2026-06-18 00:00 |
00:06:09.41 |
-01:39:33.4 |
HIP 515 |
13.70 |
| 2026-06-18 12:00 |
00:06:10.20 |
-01:39:31.5 |
HIP 515 |
13.72 |
| 2026-06-19 00:00 |
00:06:10.95 |
-01:39:29.8 |
HIP 515 |
13.74 |
| 2026-06-19 12:00 |
00:06:11.66 |
-01:39:28.4 |
HIP 515 |
13.76 |
| 2026-06-20 00:00 |
00:06:12.33 |
-01:39:27.2 |
HIP 515 |
13.77 |
| 2026-06-20 12:00 |
00:06:12.96 |
-01:39:26.3 |
HIP 515 |
13.79 |
| 2026-06-21 00:00 |
00:06:13.56 |
-01:39:25.6 |
HIP 515 |
13.80 |
| 2026-06-21 12:00 |
00:06:14.12 |
-01:39:25.2 |
HIP 515 |
13.81 |
| 2026-06-22 00:00 |
00:06:14.64 |
-01:39:25.0 |
HIP 515 |
13.81 |