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) |
| 2026-07-29 00:00 |
00:05:07.92 |
-01:50:26.8 |
HIP 438 |
3.84 |
| 2026-07-29 12:00 |
00:05:05.65 |
-01:50:44.3 |
HIP 438 |
4.45 |
| 2026-07-30 00:00 |
00:05:03.35 |
-01:51:02.0 |
HIP 438 |
5.07 |
| 2026-07-30 12:00 |
00:05:01.02 |
-01:51:19.9 |
HIP 438 |
5.70 |
| 2026-07-31 00:00 |
00:04:58.65 |
-01:51:38.0 |
HIP 438 |
6.35 |
| 2026-07-31 12:00 |
00:04:56.25 |
-01:51:56.3 |
HIP 438 |
7.01 |
| 2026-08-01 00:00 |
00:04:53.82 |
-01:52:14.8 |
HIP 438 |
7.68 |
| 2026-08-01 12:00 |
00:04:51.35 |
-01:52:33.4 |
HIP 438 |
8.36 |
| 2026-08-02 00:00 |
00:04:48.86 |
-01:52:52.3 |
HIP 438 |
9.05 |
| 2026-08-02 12:00 |
00:04:46.33 |
-01:53:11.4 |
HIP 438 |
9.75 |
| 2026-08-03 00:00 |
00:04:43.77 |
-01:53:30.6 |
HIP 438 |
10.46 |
| 2026-08-03 12:00 |
00:04:41.17 |
-01:53:50.1 |
HIP 438 |
11.18 |
| 2026-08-04 00:00 |
00:04:38.55 |
-01:54:09.7 |
HIP 438 |
11.91 |
| 2026-08-04 12:00 |
00:04:35.89 |
-01:54:29.6 |
HIP 438 |
12.65 |
| 2026-08-05 00:00 |
00:04:33.20 |
-01:54:49.6 |
HIP 438 |
13.39 |
| 2026-08-05 12:00 |
00:04:30.49 |
-01:55:09.8 |
HIP 438 |
14.15 |
| 2026-08-06 00:00 |
00:04:27.74 |
-01:55:30.2 |
HIP 438 |
14.91 |
| 2026-08-06 12:00 |
00:04:24.96 |
-01:55:50.8 |
HIP 438 |
15.68 |
| 2026-08-07 00:00 |
00:04:22.14 |
-01:56:11.5 |
HIP 438 |
16.46 |
| 2026-08-07 12:00 |
00:04:19.30 |
-01:56:32.4 |
HIP 438 |
17.25 |
| 2026-08-08 00:00 |
00:04:16.43 |
-01:56:53.5 |
HIP 438 |
18.04 |
| 2026-08-08 12:00 |
00:04:13.53 |
-01:57:14.8 |
HIP 438 |
18.85 |
| 2026-08-09 00:00 |
00:04:10.60 |
-01:57:36.3 |
HIP 438 |
19.66 |
| 2026-08-09 12:00 |
00:04:07.64 |
-01:57:57.9 |
HIP 438 |
20.48 |
| 2026-08-10 00:00 |
00:04:04.65 |
-01:58:19.7 |
HIP 438 |
21.31 |
| 2026-08-10 12:00 |
00:04:01.63 |
-01:58:41.7 |
HIP 438 |
22.15 |
| 2026-08-11 00:00 |
00:03:58.58 |
-01:59:03.9 |
HIP 438 |
22.99 |
| 2026-08-11 12:00 |
00:03:55.50 |
-01:59:26.2 |
HIP 438 |
23.84 |
| 2026-08-12 00:00 |
00:03:52.40 |
-01:59:48.6 |
HIP 438 |
24.70 |
| 2026-08-12 12:00 |
00:03:49.26 |
-02:00:11.3 |
HIP 438 |
25.57 |
| 2026-08-13 00:00 |
00:03:46.10 |
-02:00:34.1 |
HIP 438 |
26.44 |
| 2026-08-13 12:00 |
00:03:42.92 |
-02:00:57.0 |
HIP 438 |
27.33 |
| 2026-08-14 00:00 |
00:03:39.70 |
-02:01:20.1 |
HIP 438 |
28.22 |
| 2026-08-14 12:00 |
00:03:36.46 |
-02:01:43.4 |
HIP 438 |
29.11 |
| 2026-08-15 00:00 |
00:03:33.19 |
-02:02:06.8 |
HIP 438 |
30.02 |
| 2026-08-15 12:00 |
00:03:29.89 |
-02:02:30.4 |
HIP 438 |
30.93 |
| 2026-08-16 00:00 |
00:03:26.57 |
-02:02:54.1 |
HIP 438 |
31.84 |
| 2026-08-16 12:00 |
00:03:23.22 |
-02:03:18.0 |
HIP 438 |
32.77 |
| 2026-08-17 00:00 |
00:03:19.85 |
-02:03:42.0 |
HIP 438 |
33.70 |
| 2026-08-17 12:00 |
00:03:16.45 |
-02:04:06.1 |
HIP 438 |
34.64 |
| 2026-08-18 00:00 |
00:03:13.03 |
-02:04:30.4 |
HIP 438 |
35.58 |
| 2026-08-18 12:00 |
00:03:09.58 |
-02:04:54.8 |
HIP 438 |
36.54 |
| 2026-08-19 00:00 |
00:03:06.11 |
-02:05:19.4 |
HIP 438 |
37.49 |