메타데이터
| 항목 |
값 |
| Designation |
C/2018 B1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2018-03-30T10:39:55.339200Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:15Z |
| Obs used |
316 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
4.500 |
| PC |
- |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2018-10-22.0000000 |
| e |
1.00296934 |
| q (au) |
5.116718 |
| a (au) |
-1723.183540 |
| i (deg) |
162.423569 |
| Ω (om, deg) |
133.168875 |
| ω (w, deg) |
68.349093 |
| M (ma, deg) |
0.002832 |
밝기
산란 + 전체 선형
$$
M_a = (15.479 + 2.127\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
15.479 |
| n |
2.127 |
| gf |
0.999 |
| gb |
-0.810 |
| k |
0.800 |
| 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 |
| 2017-01-16 |
2018-03-03 |
+44.9933 |
-31.597 |
| 2018-08-17 |
2019-10-31 |
+3.0484 |
-2.392 |
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 |
20:54:16.20 |
-19:01:55.7 |
HIP 103166 |
3.26 |
| 2026-03-26 12:00 |
20:54:18.95 |
-19:01:51.6 |
HIP 103166 |
3.74 |
| 2026-03-27 00:00 |
20:54:21.66 |
-19:01:47.7 |
HIP 103166 |
4.26 |
| 2026-03-27 12:00 |
20:54:24.33 |
-19:01:44.1 |
HIP 103166 |
4.80 |
| 2026-03-28 00:00 |
20:54:26.95 |
-19:01:40.6 |
HIP 103166 |
5.35 |
| 2026-03-28 12:00 |
20:54:29.52 |
-19:01:37.3 |
HIP 103166 |
5.91 |
| 2026-03-29 00:00 |
20:54:32.06 |
-19:01:34.2 |
HIP 103166 |
6.47 |
| 2026-03-29 12:00 |
20:54:34.55 |
-19:01:31.3 |
HIP 103166 |
7.02 |
| 2026-03-30 00:00 |
20:54:36.99 |
-19:01:28.5 |
HIP 103166 |
7.58 |
| 2026-03-30 12:00 |
20:54:39.40 |
-19:01:26.0 |
HIP 103166 |
8.12 |
| 2026-03-31 00:00 |
20:54:41.75 |
-19:01:23.7 |
HIP 103166 |
8.66 |
| 2026-03-31 12:00 |
20:54:44.06 |
-19:01:21.5 |
HIP 103166 |
9.19 |
| 2026-04-01 00:00 |
20:54:46.33 |
-19:01:19.6 |
HIP 103166 |
9.72 |
| 2026-04-01 12:00 |
20:54:48.55 |
-19:01:17.8 |
HIP 103166 |
10.23 |
| 2026-04-02 00:00 |
20:54:50.73 |
-19:01:16.3 |
HIP 103166 |
10.74 |
| 2026-04-02 12:00 |
20:54:52.86 |
-19:01:14.9 |
HIP 103166 |
11.23 |
| 2026-04-03 00:00 |
20:54:54.94 |
-19:01:13.8 |
HIP 103166 |
11.72 |
| 2026-04-03 12:00 |
20:54:56.98 |
-19:01:12.8 |
HIP 103166 |
12.20 |
| 2026-04-04 00:00 |
20:54:58.97 |
-19:01:12.1 |
HIP 103166 |
12.66 |
| 2026-04-04 12:00 |
20:55:00.92 |
-19:01:11.5 |
HIP 103166 |
13.12 |
| 2026-04-05 00:00 |
20:55:02.82 |
-19:01:11.2 |
HIP 103166 |
13.56 |
| 2026-04-05 12:00 |
20:55:04.67 |
-19:01:11.0 |
HIP 103166 |
14.00 |
| 2026-04-06 00:00 |
20:55:06.47 |
-19:01:11.1 |
HIP 103332 |
13.87 |
| 2026-04-06 12:00 |
20:55:08.23 |
-19:01:11.3 |
HIP 103332 |
13.46 |
| 2026-04-07 00:00 |
20:55:09.94 |
-19:01:11.8 |
HIP 103332 |
13.05 |
| 2026-04-07 12:00 |
20:55:11.60 |
-19:01:12.5 |
HIP 103332 |
12.66 |
| 2026-04-08 00:00 |
20:55:13.21 |
-19:01:13.4 |
HIP 103332 |
12.28 |
| 2026-04-08 12:00 |
20:55:14.78 |
-19:01:14.5 |
HIP 103332 |
11.91 |
| 2026-04-09 00:00 |
20:55:16.29 |
-19:01:15.8 |
HIP 103332 |
11.55 |
| 2026-04-09 12:00 |
20:55:17.76 |
-19:01:17.3 |
HIP 103332 |
11.20 |
| 2026-04-10 00:00 |
20:55:19.18 |
-19:01:19.0 |
HIP 103332 |
10.87 |
| 2026-04-10 12:00 |
20:55:20.55 |
-19:01:21.0 |
HIP 103332 |
10.54 |
| 2026-04-11 00:00 |
20:55:21.86 |
-19:01:23.1 |
HIP 103332 |
10.23 |
| 2026-04-11 12:00 |
20:55:23.13 |
-19:01:25.5 |
HIP 103332 |
9.93 |
| 2026-04-12 00:00 |
20:55:24.35 |
-19:01:28.1 |
HIP 103332 |
9.64 |
| 2026-04-12 12:00 |
20:55:25.52 |
-19:01:30.8 |
HIP 103332 |
9.36 |
| 2026-04-13 00:00 |
20:55:26.64 |
-19:01:33.9 |
HIP 103332 |
9.09 |
| 2026-04-13 12:00 |
20:55:27.71 |
-19:01:37.1 |
HIP 103332 |
8.84 |
| 2026-04-14 00:00 |
20:55:28.73 |
-19:01:40.5 |
HIP 103332 |
8.59 |
| 2026-04-14 12:00 |
20:55:29.69 |
-19:01:44.2 |
HIP 103332 |
8.36 |
| 2026-04-15 00:00 |
20:55:30.61 |
-19:01:48.1 |
HIP 103332 |
8.15 |
| 2026-04-15 12:00 |
20:55:31.47 |
-19:01:52.2 |
HIP 103332 |
7.94 |
| 2026-04-16 00:00 |
20:55:32.28 |
-19:01:56.5 |
HIP 103332 |
7.75 |