메타데이터
| 항목 |
값 |
| Designation |
C/2012 L2 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-05-09T08:04:55.027200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:14Z |
| Obs used |
2119 |
| NEO |
- |
| M1 |
11.300 |
| K1 |
6.250 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2012-12-18.0000000 |
| e |
0.99733350 |
| q (au) |
1.508545 |
| a (au) |
565.739557 |
| i (deg) |
70.980594 |
| Ω (om, deg) |
270.302116 |
| ω (w, deg) |
205.786395 |
| M (ma, deg) |
359.989575 |
밝기
산란 + 전체 선형
$$
M_a = (11.171 + 4.614\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
11.171 |
| n |
4.614 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.874 |
| 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
잔차 (구간 선형)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 시작일 (UTC) |
끝 (UTC) |
a |
b |
| 2003-04-13 |
2012-06-17 |
-24.5614 |
+15.420 |
| 2012-06-17 |
2012-12-17 |
-0.8759 |
+0.427 |
| 2012-12-17 |
2013-05-09 |
+6.2793 |
-2.140 |
log10 r = log10(태양거리/AU), Δ = 지구거리(AU)
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
18:09:47.22 |
-23:30:23.7 |
HIP 88995 |
6.54 |
| 2026-03-26 12:00 |
18:09:47.10 |
-23:30:20.4 |
HIP 88995 |
6.60 |
| 2026-03-27 00:00 |
18:09:46.95 |
-23:30:17.1 |
HIP 88995 |
6.66 |
| 2026-03-27 12:00 |
18:09:46.75 |
-23:30:13.8 |
HIP 88995 |
6.72 |
| 2026-03-28 00:00 |
18:09:46.52 |
-23:30:10.6 |
HIP 88995 |
6.78 |
| 2026-03-28 12:00 |
18:09:46.25 |
-23:30:07.3 |
HIP 88995 |
6.85 |
| 2026-03-29 00:00 |
18:09:45.94 |
-23:30:04.0 |
HIP 88995 |
6.91 |
| 2026-03-29 12:00 |
18:09:45.59 |
-23:30:00.8 |
HIP 88995 |
6.98 |
| 2026-03-30 00:00 |
18:09:45.21 |
-23:29:57.5 |
HIP 88995 |
7.05 |
| 2026-03-30 12:00 |
18:09:44.79 |
-23:29:54.3 |
HIP 88995 |
7.12 |
| 2026-03-31 00:00 |
18:09:44.33 |
-23:29:51.1 |
HIP 88995 |
7.20 |
| 2026-03-31 12:00 |
18:09:43.83 |
-23:29:47.9 |
HIP 88995 |
7.28 |
| 2026-04-01 00:00 |
18:09:43.29 |
-23:29:44.7 |
HIP 88995 |
7.36 |
| 2026-04-01 12:00 |
18:09:42.72 |
-23:29:41.4 |
HIP 88995 |
7.45 |
| 2026-04-02 00:00 |
18:09:42.11 |
-23:29:38.2 |
HIP 88995 |
7.54 |
| 2026-04-02 12:00 |
18:09:41.46 |
-23:29:35.1 |
HIP 88995 |
7.64 |
| 2026-04-03 00:00 |
18:09:40.77 |
-23:29:31.9 |
HIP 88995 |
7.74 |
| 2026-04-03 12:00 |
18:09:40.05 |
-23:29:28.7 |
HIP 88995 |
7.84 |
| 2026-04-04 00:00 |
18:09:39.29 |
-23:29:25.5 |
HIP 88995 |
7.95 |
| 2026-04-04 12:00 |
18:09:38.49 |
-23:29:22.4 |
HIP 88995 |
8.07 |
| 2026-04-05 00:00 |
18:09:37.65 |
-23:29:19.2 |
HIP 88995 |
8.19 |
| 2026-04-05 12:00 |
18:09:36.78 |
-23:29:16.0 |
HIP 88995 |
8.32 |
| 2026-04-06 00:00 |
18:09:35.86 |
-23:29:12.9 |
HIP 88995 |
8.45 |
| 2026-04-06 12:00 |
18:09:34.92 |
-23:29:09.8 |
HIP 88995 |
8.59 |
| 2026-04-07 00:00 |
18:09:33.93 |
-23:29:06.6 |
HIP 88995 |
8.74 |
| 2026-04-07 12:00 |
18:09:32.91 |
-23:29:03.5 |
HIP 88995 |
8.90 |
| 2026-04-08 00:00 |
18:09:31.84 |
-23:29:00.4 |
HIP 88995 |
9.06 |
| 2026-04-08 12:00 |
18:09:30.75 |
-23:28:57.3 |
HIP 88995 |
9.24 |
| 2026-04-09 00:00 |
18:09:29.61 |
-23:28:54.2 |
HIP 88995 |
9.42 |
| 2026-04-09 12:00 |
18:09:28.44 |
-23:28:51.1 |
HIP 88995 |
9.61 |
| 2026-04-10 00:00 |
18:09:27.23 |
-23:28:48.0 |
HIP 88995 |
9.81 |
| 2026-04-10 12:00 |
18:09:25.98 |
-23:28:44.9 |
HIP 88995 |
10.01 |
| 2026-04-11 00:00 |
18:09:24.70 |
-23:28:41.8 |
HIP 88995 |
10.23 |
| 2026-04-11 12:00 |
18:09:23.38 |
-23:28:38.7 |
HIP 88995 |
10.46 |
| 2026-04-12 00:00 |
18:09:22.03 |
-23:28:35.6 |
HIP 88995 |
10.69 |
| 2026-04-12 12:00 |
18:09:20.63 |
-23:28:32.6 |
HIP 88995 |
10.93 |
| 2026-04-13 00:00 |
18:09:19.20 |
-23:28:29.5 |
HIP 88995 |
11.19 |
| 2026-04-13 12:00 |
18:09:17.74 |
-23:28:26.4 |
HIP 88995 |
11.45 |
| 2026-04-14 00:00 |
18:09:16.24 |
-23:28:23.4 |
HIP 88995 |
11.72 |
| 2026-04-14 12:00 |
18:09:14.70 |
-23:28:20.4 |
HIP 88995 |
12.01 |
| 2026-04-15 00:00 |
18:09:13.12 |
-23:28:17.3 |
HIP 88995 |
12.30 |
| 2026-04-15 12:00 |
18:09:11.51 |
-23:28:14.3 |
HIP 88995 |
12.60 |
| 2026-04-16 00:00 |
18:09:09.87 |
-23:28:11.2 |
HIP 88995 |
12.91 |